BITING MIDGES — WIRTH AND BLANTON 327 



Thorax. — Mesonotum dark brown with prominent pattern of 

 pruinose, grayish brown patches; a pair of very narrow, elongate, 

 submedian anterior ones, and four pairs of small, rounded, lateral 

 ones. Scutellum dark brown in middle, light brown on sides; post- 

 scutellum 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 = 7) spines, the one nearest the 

 spur longest. 



Wing. — Pattern as figured; pale spots relatively small and indis- 

 tinct; small pale spot over r-m crossvein broadly reaching costal 

 margin; a small, oblique, poststigmatic pale spot in cell R5; distal 

 pale spot in cell R5 small and rounded, not meeting wing margin; no 

 pale spots bordering vein Mj; pale spot in cell Mi indistinctly ap- 

 proaching wing margin, elongate; small pale spot straddling middle 

 of vein M2; small pale spots at the wing margin in cells M2 and M4, the 

 one in cell M4 broadly extending to vein M3+4 but not continued along 

 that vein; two small, separated pale spots in distal portion of anal 

 cell; pale spots present in cell M2, one in front of mediocubital fork 

 and another behind medial fork. Macrotrichia very numerous and 

 long, extending to base of wing in cell M2 and anal cell; costa extending 

 to 0.61 (0.59-0.66, n=7) of distance to wing tip. Halter brownish 

 yellow. 



Abdomen. — Brownish black. Spermathecae two, subspherical, 

 subequal, measuring 0.038 by 0.034 mm. and 0.036 by 0.031 mm. 



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

 median excavation; ninth tergum long and tapering with short, tri- 

 angular, pointed, apicolateral processes. Basistyle with ventral root 

 short, slender and pointed, dorsal root longer and slender; dististyle 

 very slender with markedly hooked, pointed tip. Aedeagus with 

 basal arch reaching to two-thirds of total length, the basal arms bent 

 in midportions; distal portion short and simple with moderately 

 slender, truncated apex. Parameres each with basal knob bearing a 

 long anterior process; stem slender at base, moderately bent before 

 the moderately stout, nearly straight midportion, without ventral 

 lobe, with distal portion twisted, only moderately narrowed to simple 

 pointed tip. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63161), Almirante, 

 Bocas del Toro Province, Panama, November 1952, F. S. Blanton, 

 light trap. Allotype male and 10 male and 50 female paratypes, 

 same data except dates October 1952 to March 1953. 



Discussion: This species is closely related to daedalus Macfie, 

 which differs in having the pale spot in cell Mi located far from the 

 wing margin, in having a third basal pale spot in anal cell, and in 



