BITING MIDGES — WIRTH AND BLANTON 355 



Thorax. — Mesonotum pruinose grayish brown with the anterior 

 and lateral margins blackish; a moderately prominent pattern of 

 narrow dark brown lines forming an H -shaped mark on the disc from 

 the humeral pits to the sides of the scutellum. Scutellum dark 

 brown in middle, yellowish on sides; postscutellum and pleuron dark 

 brown. Legs dark brown, knee spots blackish; all femora with sub- 

 apical, tibiae with subbasal and hind tibia with apical narrow pale 

 rings; hind tibia with four (n = 6) spines, the two nearest the spur 

 longest, subequal. 



Wing. — Pattern as figured; second radial cell in a moderately dark 

 spot; pale spot over r-m crossvein continued in full breadth to costal 

 margin; poststigmatic pale spot in cell R5 double, the posterior por- 

 tion slightly larger and located slightly proximad of the anterior 

 portion; distal pale spot in cell R5 suboval, broadly meeting anterior 

 wing margin its full length, filling all but extreme caudodistal corner 

 of cell; distal pale spot in cell Mj elongate, broadly meeting wing 

 margin; pale spot present straddling middle of vein M2;pale spots in 

 apices of cells M2 and M4 broadly meeting wing margin, the one in 

 cell M4 broadly rounded, nearly filling apex of cell; one pale spot, 

 which may nearly meet wing margin as a posterior point, in distal 

 portion of anal cell; a small pale spot in basal portion of anal cell; 

 cell M2 without pale spot lying in front of mediocubital fork, but a 

 large pale spot lying behind medial fork and joined broadly to the 

 pale spot over r-m crossvein. Macrotrichia sparse on distal half of 

 wing and a few in anal cell; costa extending to 0.62 (0.60-0.64) of 

 distance to wing tip. Halter dull yellowish. 



Abdomen. — Brownish black. Spermathecae two, ovoid, sub- 

 equal, measuring 0.056 by 0.036 mm., the bases of the ducts sclero- 

 tized a short distance. 



Male genitalia: Ninth sternum with a broad, moderately shallow, 

 caudomedian excavation; ninth tergum very long and narrow distad, 

 with short apicolateral processes. Basistyle with ventral and dorsal 

 roots subequal, long and slender; dististyle very slender and bent at 

 tip. Aedeagus with basal arch pointed at mesal apex, basal arms 

 strong and curved; distal portion with well sclerotized slender median 

 point flanked by a pair of sclerotized incurve processes nearly as 

 long. Parameres each with large basal knob, stem sinuate and 

 somewhat swollen beyond midlength and bearing a long, slender 

 ventral lobe or process at the subapical bend; distal portion with 

 sharp point and a lateral fringe of fine spines. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63166), Almirante, 

 Bocas del Toro Province, Oct. 28, 1952, F. S. Blanton, light trap. 

 Allotype male, same data except dates October-December 1952. 



