BITING MIDGES — ^WIRTH AND BLANTON 439 



Thorax.— Mesonotum brownish black with pattern as figured a 

 pair of large, elongate, submedian anterior spots and irregular area on 

 lateral margins pruinose grayish brown. Scutellum, postscutellum 

 and pleuron dark brown. Legs dark brown; fore and mid femora 

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

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

 nearest the spur longest, subequal. 



Wing.— Pattern as figured, pale spots small and definite; a small 

 yellowish spot over r-m crossvein to costal wing margin; the post- 

 stigmatic pale spots in cell Rj small, more or less fused, the two at the 

 same level or the posterior one sUghtly distad of the other; distal pale 

 spot in cell Rs small, rounded and not reaching wing margin- two pale 

 spots in cell M,; one pale spot in apex of cell M^, cell M4 and' anal ceU- 

 no pale spot lying ahead of mediocubital fork but a distinct pale spot 

 lying behind medial fork. Macrotrichia moderately numerous, situ- 

 ated more or less in rows, on distal portion of wing beyond end of 

 costa, none in anal cell or base of cell M2; costa extending to 0.53 

 (0.52-0.55, n=5) of distance to wing tip. Halter pale. 



Abdomen.— Dark brown; cerci pale. Spermathecae two, ovoid 

 subequal, measuring 0.046 by 0.038 and 0.042 by 0.025 mm., the bases 

 of the ducts hghtly sclerotized a short distance. 



Male genitalia: Ninth sternum with broad, shallow, caudo- 

 median excavation; ninth tergum moderately long and tapering, with 

 short, pointed, apicolateral processes. Basistyle with ventral root 

 stout, foot-shaped, the posterior heel not prolonged, dorsal root slen- 

 der; dististyle long and slender, nearly straight with bent, pointed 

 apex. Aedeagus short and stout, basal arch reaching about half of 

 total length, the basal arms stout and heavily sclerotized, distal por- 

 tion broad and spatulate with truncated apex. Parameres each with 

 large basal knob, stem slender, abruptly bent near base, sinuate in 

 midportion, abruptly bent near apex, ventral lobe only sHghtly de- 

 veloped, apex pointed with lateral fringe of fine barbs. 



Distribution: Venezuela; Panama. 



Panama records: 



Canal Zone: Mojinga Swamp. 



Los Santos Province: Puerto Mensab6. 



Discussion.— This species is closely related to hofmani Fox, but 

 can be distinguished easily by the open sensory area on the third palpal 

 segment and by the more definite wing markings in which the posterior 

 poststigmatic pale spot is usually shghtly distad of the anterior one. 

 The male genifcaUa of the Panama specimens differ sHghtly from those 

 of the type figured by Ortiz in having large distal teeth on the aedeagus 

 and the stem of the paramere stouter with small processes. A longer 

 series of males would have to be examined to determine if these differ- 



