A revision of Biting Midges of the Subgenera Forcipomyia (Metaforcipomyia) and F. (Saliohelea) from Costa Rica (Diptera: Ceratopogonidae) Author Spinelli, Gustavo R. Author Marino, Pablo I. Author Borkent, Art text Zootaxa 2012 3419 1 52 journal article 10.5281/zenodo.215031 215f451e-15f2-440d-b4f1-a5ca804ec0cb 1175-5326 215031 Forcipomyia ( Metaforcipomyia ) truncata n. sp. ( Figs. 18–23 , 140 ) Diagnosis. Male: only species of Neotropical Forcipomyia ( Metaforcipomyia ) with labrum truncate apically and bearing a row of transverse elongate spicules, scutum with uniformly dark pigmentation, parameres absent and aedeagus abruptly tapering to an elongate, slender posteriorly directed prong. Female: unknown. Description. Male. Head. Brown. Eyes abutting medially for length of three ommatidia. Antenna ( Fig. 18 ) pale brown with plume setae well developed, flagellomeres 2–4 spherical, flagellomere 10 1.36–1.41 (1.39, n = 2) X longer than flagellomere 11, flagellomeres 10–13 elongate; flagellomere 13 with apical nipple, not constricted basally; AR 0.95–0.99 ( 0.97 n = 2). Palpus ( Fig. 19 ) pale brown; segment 3 swollen proximally, with shallow, sensory pit opening at midlength; PR 2.56–2.89 (2.72, n = 2). Labrum truncate apically with row of transverse elongate spicules. Thorax. Uniformly brown, scutellum with 7 strong setae. Legs ( Fig. 20 ) brown except hind tibia with broad subapical pale band, femorotibial joints and apex of hind tibia darker, latter with 5–6 spines; tarsomeres pale with pectinate scales; tarsomere 1 of foreleg with two rows of spine-like bristles, tarsomere 1 of hind leg with patch of thick setae on basal portion; foreleg TR 1.86–1.88 (1.87, n = 2), midleg TR 1.00 (n = 2), hind leg TR 1.23–1.25 (1.24, n = 2); claws curved, moderately stout. Wing ( Fig. 21 ) plain, without pattern of pigmented membrane; M2 only visible near wing margin; intercalary vein faint; first radial cell obliterated; second radial cell well developed; fork of cubitus situated slightly distad to level of apex of costa; CuA2 obsolete on distal 1/3; wing length 1.64 (n = 2) mm; breadth 0.54–0.56 (0.55, n = 2) mm; CR 0.35. Halter pale brown. Abdomen. Tergites uniformly brown. Genitalia ( Fig. 22 ): Brown. Tergite 9 short, extending to 1/3 length of gonocoxite; posterior margin truncate; cercus lobe-like, slightly produced beyond midlength of gonocoxite; sternite 9 broad, posterior margin broadly excavated, angle deeply sclerotized, with single row of setae. Gonocoxite slen- der, 2.2 X longer than greatest breadth; gonostylus 0.85 length of gonocoxite, nearly straight, tip pointed. Parameres absent, gonocoxal apodemes slightly curved with short, pointed lateral projections. Aedeagus ( Fig. 23 ) stout, triangular, lateral margins heavily sclerotized, abruptly tapering to pale, slender posteriorly prong; basal arch poorly sclerotized, extending to 1/10 of total length; lateral arms extending laterally. FIGURES 18–23. Forcipomyia ( Metaforcipomyia ) truncata sp. n. , male. 18—flagellum; 19—palpus; 20—legs (lateral view); 21—wing; 22—genitalia (ventral view); 23—aedeagus. Female. Unknown. Distribution. This species is known only from the lowlands of northwestern Costa Rica at elevations of 40 meters ( Fig. 140 ). Unlike other Costa Rican species of F . ( Metaforcipomyia ), which are all in wet, humid habitats, F. truncata is in an area of dry deciduous forest. Taxonomic discussion. Characters to distinguish this species from F . pluvialis and F . rivalis may be found in the key and the taxonomic discussion under the latter species. Type material. Holotype male on microscope slide, labeled “ HOLOTYPE Forcipomyia (Metaforcipomyia) truncata Spinelli, Marino and Borkent , Costa Rica , Guanacaste prov., La Cruz, Santa Rosa NP, Sector Murciélago, 5.5 km ENE Cerro Guachipelin, 40 m , 25/ 27-VII-1996 , M. Araya, Malaise tp. LN343450 320900 #7876, CD 5269” ( INBC ). Paratype , 1 male as follows: Costa Rica , Guanacaste prov., Sector Murciélago, 3 km NNW Cerro Guachipelin, 40 m , 7-II-1996 , M. Araya, Malaise tp., CD 5271 ( CNCI ). Derivation of specific epithet. The name truncata – truncus (cut off) refers to the truncated labrum of adult males of this species.