378 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



8:16:23:9:9, third segment moderately swollen, 2.18 (2.09-2.27, 

 n = 2) times as long as greatest breadth, with a broad, shallow, sensory 

 pit. Mandible with 14-15 (n=2) teeth. 



Thorax.— Mesonotum a rich, dark, brownish black with a prominent 

 pattern of bluish gray patches, consisting mainly of a submedian, 

 anterior, elongate pair and three lateral pairs of irregularly rounded, 

 smaller spots. Scutellum brownish black in middle, grayish pruinose 

 on sides; postscutellum and pleuron brownish black. Legs dark 

 brownish black, femora with subapical and tibiae with subbasal, nar- 

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

 est the spur longest. 



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

 markedly elongated ; pale spot over r-m crossvein very large, extending 

 well into cell M2; poststigmatic pale spot in cell R5 3-lobed, L-shaped^ 

 nearly isolating a small round dark spot behind second radial cell; 

 distal pale spot in cell R5 irregularly shaped, broadly meeting wing 

 margin anterodistad and narrowly touching pale line along vein M, 

 posteriorly; vein M. pale margined distal to level of distal pale spot in 

 cell R5, veins M2 and M3+4 with only a pale spot at wing margin ; cell 

 Ml with two elongate pale spots, the distal one nearly meeting wing 

 margin; two pale spots in distal portion of cell M2, the apical one 

 broadly meeting wing margin; cell M4 with a small, round, pale spot 

 m center of cell ; anal cell with two separate pale spots in distal portion 

 and base broadly pale with basal pale area covering a band across 

 entire wing; cell M^ with a pale spot lying in front of mediocubital fork 

 and one lying behind medial fork. Macrotrichia sparse on distal third 

 of wing in cells R5, M, and M2; costa extending to 0.63 (0.62-0.68, 

 n=3) of distance to wing tip. Halter yellowish, base of knob dark. 



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

 ovoid, slightly unequal, measuring 0.050 by 0.034 mm. and 0.046 by 

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



Male genitalia: Ninth sternum with a broad, deep, caudomedian 

 excavation; ninth tergum broad at apex, with long, slender, apico- 

 lateral processes. Basistyle with ventral root foot-shaped, the pos- 

 terior heel not developed, the dorsal root well developed; dististyle 

 long, slender and gently curved, with pointed tip. Aedeagus with 

 broad, pointed basal arch extending to more than three-fourths of 

 total length, the basal arms stout and curved; distal portion a short 

 lobe with rounded, simple tip. Parameres each with small basal 

 knob, stem slender, gently curved and somewhat swollen in midpor- 

 tion, gradually tapered distad to long, simple filiform tip. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63167), allotype 

 male, Almirante, Bocas del Toro Province, December 1952, F, S. 



