Revision of Thisiomorphus Pic (Coleoptera: Mycteridae: Eurypinae) with descriptions of eleven new species from Central and South America and a key to genera of Neotropical Eurypinae Author Pollock, Darren A. text Zootaxa 2016 4093 3 301 322 journal article 10.11646/zootaxa.4093.3.1 85f537f5-faf4-4a89-839b-8f56feadb0e4 1175-5326 264106 565068DE-7042-483D-99FD-50BD2FA86BC1 Thisiomorphus osaensis , new species ( Figs 11 , 19 , 36) Holotype , male, labeled: “Est. Esquinas, Península de Osa., Prov. Puntarenas, COSTA RICA , 200m . Abr 1993 , J.F. Quesada, L S 301400_542200 [8.759387, -83.283128] # 2076 // [barcode label] COSTA RICA INBIO CRI 001 928752 // [large red label] HOLOTYPE ♂ Thisiomorphus osaensis Pollock ”, in INBC . Allotype , female, labeled: “Rancho Quemado, 200m , Peninsula de Osa, Prov. Punt., COSTA RICA , J.C. Saborio,. May 1991 , L-S-292500,511000 [8.679096, -83.566714] // [barcode label] COSTA RICA INBIO CRI 000 326498 // [large red label] ALLOTYPE ♀ Thisiomorphus osaensis Pollock ”, in INBC . Paratypes : 1 male , labeled: “ COSTA RICA . Prov. Puntarenas, Osa, Sierpe, R.F. Golfo Dulce. Rancho Quemado, 200m . 28 NOV.–20 DEC. 1993 . A.Marin, Trampa Malaise. L S 292500 511000 [8.679096, -83.566714] #2594 // [barcode label] INB0003412674 INBIOCRI COSTA RICA ”, in INBC; 1 male , labeled: “Rancho Quemado, Peninsula de Osa, 200m . Prov, Punt., COSTA RICA , F.Quesada, Dic 1991 , L-S-292500,511000 [8.679096, -83.566714] // [barcode label] COSTA RICA INBIO CRI000 330950”, in INBC; 1 female , labeled: “Rancho Quemado, 200m , Peninsula de Osa, Prov. Puntarenas, Costa Rica Junio 1992 , F.Quesada y M.Segura L-S 292500, 511000 [8.679096, -83.566714]// [barcode label] COSTA RICA INBIO CRI000 469032”, in INBC; 1 female , labeled: “ COSTA RICA , Prov. Puntarenas, Golfito, Est Agujas. 250- 350m . 15 ENE-15 FEB 2000 . J. Azofeifa. Malaise L_S_276750_526550 [8.536614, -83.425512] #55208 // INB0003314874 INBIOCRI COSTA RICA ”, in INBC. Derivation of specific epithet. Named in reference to the Osa Peninsula ( Costa Rica ), the geographical area from which almost all known specimens have been collected. Diagnosis. This species is one of the most distinctive in the genus, and exhibits the following diagnostic features: body elongate, elytra somewhat parallel-sided; antennomeres short, submoniliform; pronotum yellow, contrasting dark base of head and dark elytra; sutural margin of elytra with row of whitish setae. The abovementioned features (and others) isolate this species from all other members of Thisiomorphus ; based on especially the shape of antennomeres and the contrasting color pattern, I suspect that T . osaensis is a component of a mimetic complex, the other members of which remain unknown. Description. measurements (in mm, N=6): HL = 0.84–0.96; PL = 0.80–0.92; EL= 7.90–10.00; GHW = 1.00– 1.08; GPW = 0.96–1.08; GEW = 1.76–2.08; TL = 4.92–5.80 mm . Measurement ratios: EL/GEW = 1.72–1.97; GPW/PL = 1.14–1.24; TL/GEW = 2.63–3.02; GPW/GHW = 0.96–1.00. With characters of Thisiomorphus , and the following: Body distinctly elongate (TL/GEW 2.78), lateral elytral margins only slightly arcuate. Color . Antennae uniformly piceous except for rufous scape; maxillary palpi rufous to piceous, terminal palpomere darker than preceding 2 palpomeres; head rufous anteriorly, becoming abruptly darker, piceous to black, at about midlength of eye; anterior margin of dark area with V-shaped incision medially; pronotum rufotestaceous, in most specimens with irregular, sub-triangular piceous basal area, extended anteriorly to near midlength; elytra uniformly non-metallic piceous, light colored setae giving indistinct impression of sutural vitta; femora rufotestaceous, infuscated piceous distally; tibiae and tarsi piceous; venter rufous, mesothorax somewhat darker, corresponding to darker prosternum. Antennae relatively short; antennomeres short, submoniliform, 8–10 very slightly widened distally. Pronotum relatively narrow, slightly wider than long (GPW/PL 1.19), subequal in width to head (GPW/GHW 0.98); lateral margins very slightly arcuate, widest about midlength; dorsal surface evenly convex, without depressions. Male genitalia . Parameres slightly shorter than basale, inner margins very shallowly sinuate basally; basale with anterior margin slightly curved, lateral margins straight to near base, then abruptly angulate. Distribution. All known specimens are known from southern COSTA RICA (Puntarenas). All but one specimen were collected on the Osa Peninsula.