BITENG MIDGES — WIRTH AND BLANTON 353 



male genitalia). — Ortiz and Leon, 1955, Inf. Cient. Nac. Eduador, no. 67, 

 p. 577 (Ecuador). 



Female: Length of wing 0.80 (0.79-0.82, n = 5) mm. 



Head. — Eyes nearly continguous, bare. Antenna with flagellar 

 segments in proportion of 15 : 10 : 1 1 : 12 : 13 : 13 : 13 : 13 : 17 : 18 : 19 :20 : 32, 

 antennal ratio 1.06; distal sensory tufts present on segments iii, 

 vii-x. Palpal segments in proportion of 8:15:20:6:7, third segment 

 considerably swollen up to the apex, 1.8 (1.7-1.8, n = 5) times as long 

 as greatest breadth, with a moderately broad, shallow sensory pit. 

 Mandible with 13 (12-14, n = 5) teeth. 



Thorax. — Mesonotum dark brown with extensive, pruinose, yellow- 

 ish patches as figured, principally two elongate submedian anterior 

 marks, two pairs of lateral spots and extensive prescutellar areas. 

 Scutellum narrowly dark brown in middle, yellowish on sides; post- 

 scutellum and pleuron dark brown. Legs dark brown, all femora 

 with subapical, all tibiae with subbasal, and hind tibia with broad 

 apical pale rings; hind tibial comb with four (n=5) spines, the one 

 next to the spur longest. 



Wing. — Pattern as figured, closely resembling that of galindoi but 

 with the distal pale spot in cell R5 shortened and rounded distally, 

 and extending obliquely to the anterior wing margin, not following 

 vein Ml to the wing tip. Macrotrichia sparse on distal fourth of wing; 

 costa extending to 0.63 of distance to wing tip. Halter pale. 



Abdomen. — Brownish black; cerci yellowish. Spermathecae two, 

 slightly unequal, pyriform, measuring 0.059 by 0.042 mm. and 0.055 

 by 0.046 mm. 



Male genitalia: Ninth sternum with shallow caudomedian ex- 

 cavation; ninth tergum tapering, with small, triangular apicolateral 

 processes. Basistyle with ventral root foot-shaped, dorsal root 

 slender; distist3de slender, with bent apex. Aedeagus with rounded 

 basal arch, the basal arms slender and curved, distal stem slender and 

 tapering to bluntly rounded apex, the ventral side appearing channel- 

 like. Parameres each with knobbed base, slender, bent stem with 

 distinct ventral lobe, apical portion tapered to fine point with sub- 

 lateral barbs. 



Distribution: Brazil; Ecuador; Honduras (Lancetilla) ; Panama; 

 Trinidad (Tucker Valley) ; Venezuela. 



Panama records: 



Canal Zone: Fort Sherman, Mojinga Swamp. 

 PanamX Province: Arraijdn, Cerro Campana. 



Discussion: This widely distributed Neotropical species is rare 

 in Panama. It is readily distinguished from the closely related 

 Panama species, galindoi Wirth and Blanton, by the presence of the 



