Ischnocnemis edmundi Eya, 2024

Ischnocnemis edmundi Eya , new species

( Fig. 396–408 View Figures 396–408 )

Description. Male: Length 12–13 mm. Form small, elongate, narrow; integument black with greenish to bluish metallic cast, elytra dark brownish black with vague bluish-violet cast, each elytron with an elevated, ivory, subsutural costa ( Fig. 406–407 View Figures 396–408 ). Head small; vertex, coarsely, subconfluently punctate with erect setae; front coarsely, irregularly punctate ( Fig. 400–402 View Figures 396–408 ); postclypeus glabrous, distal margin finely, irregularly punctate; antennal tubercles horizontal with apices broadly angulate; genae short, nitid, sparsely, irregularly punctate, punctures finer, denser beneath ( Fig. 401 View Figures 396–408 ); pubescence on antennal tubercles and dorsal anterior margin of genae obscure, short and erect; labrum finely, densely punctate, pubescence moderately dense and suberect; antennae slender, exceeding elytral apices by three antennomers; scape conical coarsely, rugosely punctate, pubescence sparse, short, suberect; antennomeres II–VI cylindrical with apices slightly enlarged, integument rugulose, coarsely, striate-punctate and canaliculate, pubescent sparse, depressed; remaining antennomeres opaque, densely, minutely punctate and densely covered with minute, appressed setae with few short depressed setae on apices; antennomeres V–VI carinate on outer surface, VI–X carinate on inner surface; antennomere III longer than I; IV shorter than III, longer than I; V longer than III; VI, VII, VIII, and IX subequal to V; X slightly shorter than IX; XI longest, apical fifth arcuate. Pronotum as long as broad (L/W: 1.0), sides slightly rounded; disc shallowly convex, coarsely, subconfluently punctate with elongate, longitudinally glabrous, impunctate area in middle of basal half; apex margined, narrowly constricted behind; base vaguely impressed at sides ( Fig. 403 View Figures 396–408 ); pubescence sparse, short in middle, obscure, long and erect on sides; proepisternal area more contiguously punctate than disc, pubescence sparse, obscure, long, erect; prosternum vaguely impressed, apical half transversely plicate, basal half confluently punctate, area above coxae on each side with rugulose, confluently punctate area, pubescence obscure, moderately dense, long and erect; mesosternum coarsely, irregularly punctate in middle, finely, contiguously, rugosely punctate at sides, pubescence long, erect; mesosternal intercoxal process as wide as coxal cavity; mesepisterna and mesepimera rugulose with punctures fine, dense, contiguous, pubescence obscure, appressed and pale with few long, erect setae; metasternum with integument nitid, coarsely, discretely punctate, punctures sparse on each side of midline, finer and denser near posterior margin of mesocoxae, pubescence moderately, dense and suberect; metepisterna densely clothed with short, appressed, pale pubescence. Scutellum black with bluish violet to greenish cast, triangular, impunctate to sparsely punctate on dorsum. Elytra 2.8 times as long as broad; each elytron with raised, narrow, impunctate, subsutural ivory costa with sides broadly yellow, integument sparsely, discretely punctate near base, more densely, closely punctate towards apices, punctures adjacent to epipleural margin fine, dense; pubescence sparse, long and erect near base, shorter and suberect near apices; apices obliquely truncate, slightly tapered to sutural margin, exterior angles unarmed, angulate ( Fig. 405 View Figures 396–408 ). Legs slen- der, nitid; femora coarsely, densely punctate, obscurely clothed with minute, depressed setae on dorsum, setae longer on ventral surface; pro- and mesofemora slightly clavate; metafemora linear, slightly arcuate near base, shorter than body and attaining fourth abdominal sternite; tibiae densely, rugosely punctate, sparsely clothed with short, depressed setae; protibiae with inner surface densely clothed with short depressed, pale pubescence; metatarsomere I subequal to tarsomeres II and III combined ( Fig. 408 View Figures 396–408 ). Abdomen nitid, punctures sparse, shallow, and fine, pubescence sparse, long and suberect, sides more minutely, densely punctate, pubescence short and appressed; apex of last sternite truncate, and vaguely emarginate at middle.

Female: Length 11–14 mm. Form stouter than male. Antennae shorter than male, attaining to slightly shorter than elytral apices; antennomeres II–V with pubescence denser than male, antennomeres from V externally angulate and gradually flattened to XI, inner and outer surface from VI vaguely carinate; antennomere III longer than I, IV slightly shorter than III, V–VI subequal to III, VII slightly shorter than VI, VIII shorter than VII, IX subequal to VIII, X shorter than IX, XI subequal to IV. Prosternum rugulose, striate-punctate throughout. Elytra 2.6 times as long as broad, apices truncate to sinuate truncate, exterior angles unarmed. Abdomen with apex of last sternite broadly truncate, and vaguely emarginate at middle.

Etymology. The species is dedicated to Edmund F. Giesbert in recognition of his many contributions to the study of Cerambycidae .

Type materials. Holotype, male ( FSCA 00082449 View Materials ), and allotype, female ( FSCA 00082450 View Materials ): MEXICO: Chiapas: 2–6 km S. La Trinitaria, 19–20 Oct. 1988, E. Giesbert both deposited in FSCA. Ten paratypes, all from MEXICO: Chiapas: 2–6 km S. La Trinitaria , 19–20 Oct. 1988, E. Giesbert (4 males, 2 females, FSCA); 3–5 km S La Trinitaria, 19/ 20 Oct. 1988, J.E. Wappes (2 males, 1 female, FSCA), (1 male, DJHC).

Discussion. This species is currently included in Ischnocnemis Thomson ; however, it may represent a new genus closely related to Ischnocnemis . Ischnocnemis edmundi Eya new species can be differentiated from other Ischnocnemis species by the following characteristics: (1) the dark metallic greenish to bluish integument ( Fig. 396–407 View Figures 396–408 ); (2) single ivory subsutural raised vitta on each elytron ( Fig. 406–407 View Figures 396–408 ); (3) dorsum of antennomeres III to VI that are striate-punctate or canaliculate; and (4) long, obscure, erect setae on the sternum and proepisternal area. The dorsal half of genae of this species are broader and more prominent compared to other species ( Fig. 401 View Figures 396–408 ); and therefore, the anterior margins of lower eyes are separated from the base of mandibles. Other species of Ischnocnemis have retracted mandibles with dorsal half of genae very narrow where the anterior margins of lower eyes are almost contiguous with the base of mandibles, and antennomeres II–VI that are cylindrical and finely densely punctate. The outer edges of maxillary palpi are vaguely impressed as occasionally found in some specimens of I. caerulescens Bates. The metatarsomere I is subequal to tarsomeres II and III combined as in I. caerulescens and I. sexualis ( Fig. 408 View Figures 396–408 ). The mesosternum of this species is not excavated anterior or depressed in the middle; however, lack of this depression is occasionally found in some specimens of I. glabra .

Ischnocnemis edmundi may appear to fit the description of Ischnocnemis minor Bates (i.e., Mannophorus minor (Bates) , new combination redescribed above). Bates (1880: 83) describes I. minor with “ elytris costis eburneis duabus elevatis apicem fere attingentibus,” which translates from Latin to, “elytra with two ivory raised costae nearly reaching the apex,” This statement may infer that each elytron of I. minor has a single ivory costa as in I. edmundi ; however, the photo of the I. minor , holotype, ( Bezark 2024, id: 16963) has two ivory costae on each elytron. Therefore, I. edmundi with single ivory vitta on elytron is not conspecific with I. minor . Also, the precise locality for I. minor is recorded as Puebla, according to the Sallé collection ( Bates 1885: 328), which is approximately 900 km northwest of La Trinitaria, Chiapas where I. edmundi types were all collected.