Compsibidion iviei Lingafelter, 2024

Compsibidion iviei Lingafelter , new species

( Fig. 9, 11 View Figures 9–12 )

Diagnosis. Compsibidion iviei is distinct from all other known species, but is perhaps most similar to the Guatemalan and Nicaraguan C. vandenberghei Heffern, Santos-Silva, and Nascimento (2018) in size and color pattern. It differs by having antennomeres 3–5 greatly thickened relative to the remaining antennomeres, having the apical fourth of the elytra pale yellow, without dark maculations, and having other dark maculae lighter brown in comparison to those found in C. vandenberghei .

Description. Holotype male. 10 mm long; 2 mm wide at humeri. Color: Head light reddish-brown with darker brown areas on middle of frons and vertex between antennal tubercles. Pronotum very pale with darker areas on anterior margin, at sides and disk, just anterior to middle, and along extreme posterior margin. Elytra very pale with a darker brown macula at basal third somewhat forming an “X” when combined on both elytra and with a large diamond-shaped brown macula on apical third of combined elytra. Venter mostly darker reddish-brown than pronotum and elytra. Legs and antennae slightly darker reddish-brown than most of pronotum and elytra.

Head. Prominent antennal tubercles, acute at apices. Mostly impunctate with a few scattered punctures on tubercles and vertex; subrugose at occiput and frons between lower eye lobes. Mostly glabrous except for a few long setae around lower eye lobe and margins of gula and frontoclypeus. Eyes small and consisting almost entirely of lower lobes which occupy less than half the height of the head below tubercles as viewed laterally. Upper eye lobes consisting of less than 12 ommatidia and demarcated by a 90 degree extension mesally from lower lobe. Upper lobes terminating at plane along outer margin of antennal tubercle and widely separated. Antennae with 3–5 antennomeres strongly swollen and over twice as thick as distal antennomeres. Antennomere 6 and base of 7 with a thin, dorsal carina. Scape (dorsally) and basal swollen antennomeres (mesally) with long, but sparse golden-translucent setae; remaining antennomeres with denser and short (but inconspicuous) golden-translucent setae. Antennae extending beyond elytral apices by over 3 antennomeres. Antennomeres 3 and 11 longest, each at least 1.5 × length of scape; antennomere 4 shortest and subequal to scape; antennomeres 6–11 progressively longer.

Thorax. Pronotum shiny, cylindrical, impunctate, glabrous except for a few long translucent setae; without lateral tubercles, with two anterodorsal tubercles; much longer than wide (2.5 mm long, 1.5 mm wide). Prothorax strongly elevated at anterior half when viewed laterally. Prosternal process very narrow between procoxae with apex strongly expanded; procoxae open posteriorly by about one-fourth their width. Mesosternum and metasternum shiny and nearly glabrous and impunctate. Elytra shiny, nearly glabrous and impunctate except for widely scattered, sparse, long, erect setae emanating from scattered punctures. Elytral apices truncate, lacking spines. Scutellum rounded, covered in dense, short, appressed, translucent setae. Femora clavate. Metafemora not attaining elytral apices. Femoral apices rounded. Mesocoxae separated by narrow mesosternal process that is about half the width of the mesocoxa.

Abdomen. Shiny and mostly glabrous and impunctate except for scattered long golden-translucent setae.

Apex of last ventrite broadly rounded.

Variation. Sexual dimorphism is most evident in the antennae which do not have antennomeres 3–5 swollen in females. Antennomeres 4–7 have a narrow dorsal carina in females. Antennal tubercles are less elevated and more rounded apically in females. Males (n=5) 7.5–10.0 mm long; 1.8–2.0 mm wide at humeri; females (n=1) 8.5 mm long; 2.0 mm wide at humeri.

Type material. Holotype (male): DOMINICAN REPUBLIC: Pedernales Province, 14 km N Cabo Rojo, 150 m, 19 August 1988, thorn scrub trop. Dry forest , M. A. Ivie, K. Philips & K. A. Johnson ( USNM) . Paratypes, same data as holotype (1 male, USNM; 3 males, WIBF) ; DOMINICAN REPUBLIC, Pedernales Province, Cabo Rojo , 10 m, 17.55°N, 71.89°W, 26 September 1991, C. Young, S. Thompson, R. Davidson, J. Rawlins (1 female, CMNH) GoogleMaps .

Etymology. This species is named for my friend and colleague, Michael Ivie, who collected much of the type series and generously provided material from the WBIF for examination and donated the holotype to the USNM.

Remarks. Using the key to subtribes and genera in Martins and Galileo (2007), Compsibidion iviei Lingafelter was characterized. This species fell naturally into Neoibidionina due to the posteriorly open procoxal cavities, cylindrical (not pear-shaped) scape, and antennomere 4 being much shorter than antennomere 3 and, along with antennomeres 3 and 5, much enlarged compared to the remaining antennomeres. In the key to genera of Neoibidionina ( Martins and Galileo 2007) , this species was placed in the genus Compsibidion due to the head and anterior margin of pronotum not being strongly constricted; elytra shiny, without pubescence except for sparse, long setae; pronotum without microsculpture and with a shiny appearance; antennomere 4 notably shorter than 3 and slightly shorter than 5; males with antennomeres 3–5 enlarged, and having the enlarged antennomeres much narrower than the prothorax.

Compsibidion is exclusively South American except for four species known from Central America ( C. vandenberghei Heffern, Santos-Silva, and Nascimento ; C. tuberculatum Bezark and Santos-Silva ; C. mysticum Martins ; and C. marqueti Audureau ) and one species, C. maronicum (Thomson) , which is known from Trinidad and is also widespread throughout South America ( Bezark 2024) .

This species has been collected only around Cabo Rojo in Pedernales Province in August and September.

Hormathus Gahan, 1890