BITING MIDGES — WIRTH AND BLANTON 307 



Thorax. — Mesonotum subshining, yellowish brown, darker brown 

 to blackish on anterior margin, humeri and sensory pits whitish 

 pruinose, a small blackish spot present medially just anterior to 

 scutellum. Scutellum, postscutellum and pleura yellowish brown. 

 Legs yellow, hind knee with a black spot; hind tibial comb with six 

 spines, the second from the spur longest. 



Wing. — Pattern as figured, the pale areas predominant. Macro- 

 trichia sparse in apices of cells R5, Mi and M2; costa extending to 0.63 

 of wing length. Halter yellowish white. 



Abdomen. — ^Brownish black; terga with narrow, whitish, apical 

 bands. Spermathecae two, pyriform, subequal, measuring 0.048 by 

 0.039 mm. 



Male genitalia: Ninth sternum very narrow, with a very shallow 

 caudomedian excavation; ninth tergum short and tapering, apico- 

 lateral process very small, caudal margin between them cleft and 

 bilobate, with a submedian pair of hyaline, bare, rounded lobes 

 produced caudad. Basistyle with ventral and dorsal roots poorly 

 developed, mesal margin with fine spinose setae. Aedeagus with 

 broad base, basal arms stout, a sclerotized anterior band at one-fourth 

 distance to apex, the apex slender with a spherical tip and internal 

 peg. Parameres fused for a third of total length, the fused bases 

 without winglike or lateral expansions, the basal margin concave, the 

 free portions very slender and tapering to fine, minutely hairy tips. 



Distribution: Panama; Nicaragua. 



Panama records: 



BocAS DEL ToRO PROVINCE: Almirante. 

 CniRiQuf Province: Cerro Punta, Volcdn. 

 Cocl:^ Province: El Retire, El Valle, Penonom^. 

 Darien Province: Jaqu6. 

 Panama Province: Cerro Campana (type locality). 



Discussion : Related to covagarciai in wing and mesonotal pattern, 

 the short proboscis and unmodified antenna, but unique in having the 

 third palpal segment swollen without sensory pit, only hind knee black, 

 and the male genitalia with mesally cleft, bilobate tergum and fused 

 parameres. 



The nigrigenus group 



This group consists of large species with knees black-spotted and 

 legs mostly yellowish; mesonotum dull grayish to brownish; palpus 

 with a large, deep, sensory pit; male genitalia with basistyle mesally 

 spinose, apicolateral processes well developed, aedeagus without 

 basal barlike sclerotization or ball-like tip, parameres separate with 

 well-developed basal knob. Differs from the covagarciai group by 

 having moniliform proximal antennal segments (antennal ratio. 



