Dyscolus variegatus, Traces, 2024

Dyscolus variegatus sp. nov.

(Fig. 8)

ZooBank: https://zoobank.org/ 61EAA70A-B553-4276-A6E2-0EE592D38A24

Holotype, ♂, Ecuador, Provincia Cotopaxi, Otonga , 1900 m, 79°00 W, 00°25 S, 10 May 1998, J. Bravo leg. ( QCAZ). The holotype and only known specimen lacks eight articles of the right antenna and the three last articles of the right protarsus. GoogleMaps

Diagnostic combination. – Dyscolus variegatus sp. nov. is closely related to D. variabilis Chaudoir, 1837 , widespread in Mexico ( Whitehead 1973) and also known from Guatemala (D. Shpeley, personal communication). Differences are as following: D. variegatus sp. nov. has piceous-black to brownish integuments (dark brown to reddish-brown in D. variabilis , Fig. 8a); the hind angles of the pronotum are right-angled and sharp (slightly obtuse and blunt in D. variabilis ); the apical bead of the pronotum is interrupted at middle (complete in D. variabilis ); the elytral striae are shallow, punctate, with slightly convex intervals (striae deeper, continuous, not punctate, with flat intervals in D. variabilis ); the lobes of the fourth metatarsomere are shorter in D. variabilis (Fig. 8d-e).

Description

Habitus . – Fig. 8b. Fully winged. Body length: 11.3 mm.

Colour. – Head, pronotum and ventral sclerites black, elytra coloured by a moderately bright, green-yellowish metallic reflection; legs entirely piceous-black; antennomeres 1-4 piceous-black with a reddish apex, 5-11 brownish; palpi piceous-black with a reddish apex. Upper surface of the body smooth and shiny.

Microsculpture, mesh pattern. – Head and pronotum: transverse, very faintly impressed to almost obsolete; elytra: long and narrow meshes, slightly more impressed.

a. Habitus. b. Apex of the elytra. c. Last visible ventrite and gonocoxites.

Head. – Elongate; eyes big and convex, genae short and flat, hardly separated from the neck, collar constriction shallow. Mandibles large, curved at apex.Mentum tooth simple with a broad and blunt apex.Antennae moderately long, with four antennomeres extending backward beyond the base of the pronotum.

Prothorax. – Pronotum transverse (PL/PW = 0.8), cordiform. Hind angles sharp and right-angled, the setigerous pore close to it; anterior angles protruding, broadly rounded; laterobasal impressions deep, simple; lateral margins broad, reflexed in basal half, explanate in distal half; basal bead complete, apical bead interrupted at middle; two pairs of lateral setae. Shallow oblique or transverse wrinkles in the basal area and on the sides of the disc. Sides of the prosternal process distinctly bordered.

Elytra. – Subparallel in first 2/3, fusiform at apex, humeri broadly rounded. Striae thin and shallow, punctate, with short interruptions between the punctures which are small, scarcely broader than the stria itself; third interval with 3 setae; intervals slightly convex. Subapical sinuation weak; apex separately rounded. Umbilicate series of 19 to 20 setiferous punctures.

Abdomen. – Last visible abdominal ventrite evenly rounded apically, with one pair of setae along its apical margin.

Legs. – Slender; metafemora withoutsetaeon the anterior ridgeandwith two ventroposterior setae. Dorsal face of all tarsi almost flat, squamose, with

10

c

d

e a b

mm 2

0.5 mm

Fig. 8. Dyscolus variabilis Chaudoir, 1837 & D. variegatus sp. nov.

a, e. D. variabilis Chaudoir, 1837 . a. Habitus, ♀, Toluca , Mexico. e. Detail of right metatarsus.

b, c -d. D. variegatus sp. nov., holotype, ♂, Otonga , Ecuador. b. Habitus. c. Aedeagus, lateral. d. Detail of right metatarsus, dorsal .

lateral sulci on both sides; fourth metatarsomere with a pair of subapical dorsolateral setae, apical lobes large, the outer lobe twice as long as the inner lobe (Fig. 8d). Fifth tarsomeres asetose ventrally.

Male genitalia. – Fig. 8c. Basal bulb of the median lobe moderately broad; first half of the median shaft almost straight, second half strongly arcuate in lateral view; apex acuminate, triangular in dorsal view. Endophallus without sclerotized structures.

Female genitalia. – Unknown.