BITING MIDGES — WIRTH AND BLANTON 415 



tufts present on segments iii, viii-x. Palpal segments in proportion 

 of 6:17:20:7:7, third segment moderately swollen, 1.8 (1.7-1.9, 

 n=6) times as long as greatest breadth, with broad, deep, sensory- 

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



Thorax. — Mesonotum bluish gray pollinose, with two prominent, 

 jet black, sublateral, longitudinal patches, widest at the mesonotal 

 suture. Scutellum narrowly dark brown in middle, pale on sides; 

 postscutellum and pleuron dark brown. Legs dark brown; fore and 

 mid femora with subapical and all tibiae with subbasal narrow pale 

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

 spur longest. 



Wing. — Pattern as figured; pale spot over r-m crossvein large and 

 meeting anterior wing margin; poststigmatic pale spots in cell R5 

 small, distinctly separated, the posterior one located slightly proxi- 

 mad of the anterior one, its diameter longest in the longitudinal axis 

 of wing; distal pale spot in cell R5 reniform, broadly meeting anterior 

 wing margin anterodistad ; vein Mi pale-margined on distal half; 

 two pale spots in cell Mj, the distal one far removed from wing margin; 

 two pale spots in distal portion of cell M2, connected narrowly by a 

 pale line bordering posterior margin of vein M2; pale spot in cell M4 

 large; two pale spots in distal portion of anal cell; pale spots present in 

 front of mediocubital fork and behind medial fork, base of wing pale 

 from costal margin to the proximal fourth of anal cell. Macro- 

 trichia very sparse on distal fourth of wing and extending along pos- 

 terior margin to distal part of cell M4; costa extending to 0.70 (0.68- 

 0.72, n = 5) of distance to wing tip. Halter pale. 



Abdomen.^Dark brown, cerci yellowish. Spermathecae two, 

 slightly unequal, ovoid, measuring 0.048 by 0.031 mm. and 0.045 by 

 0.028 mm., the bases of the ducts sclerotized a considerable distance. 



Male genitalia: Ninth sternum with very shallow caudomedian 

 excavation; ninth tergum short, very broad and truncate apically 

 with slender apicolateral processes. Basistyle with ventral root foot- 

 shaped, the posterior heel sharp, the toe long and pointed, dorsal root 

 slender; dististyle long and slender, markedly curved to a pointed 

 apex. Aedeagus with basal arch extending to three-fourths of total 

 length, pointed at mesal apex, the basal arms curved; distal apex 

 simple, with slender, rounded point. Parameres each with well- 

 developed basal knob, stem gradually curved to the well-developed, 

 pointed, ventral lobe, distal portion slender and tapered to apical 

 point with a lateral fringe of fine barbs. 



Distribution: Ecuador; Panama. 



Panama records; 



BocAS DEL ToRO Province: Almirante. 

 Canal Zone: Fort Davis, Loma Boracho. 



