392 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



Thorax. — Mesonotum dark brown, with prominent pattern of small, 

 yellowish-white spots arranged as follows: a pair on humeri; two pairs 

 of elongate submedian spots, one at suture, the other in the prescu- 

 tellar depression; five pairs of very small spots in a pair of lyre-shaped, 

 curving lines, the anteriormost pair covering sensory pits, the second 

 pair behind and slightly laterad, third and fourth pairs on lateral 

 margins on each side of suture and the fifth pair above the wing bases. 

 Scutellum broadly black in the middle, yellowish on sides, extreme 

 sides narrowly black. Postscutellum and pleuron dark brown. Legs 

 dark brown, femora with subapical, tibiae with subbasal, and hind 

 tibia with apical, narrow pale rings; hind tibial comb with four 

 (n=2) spines, the one nearest the spur longest. 



Wing. — Pattern as figured, the distal wing spots forming a wheel-like 

 pattern; second radial cell long, very dark; r-m crossvein dark, with 

 a very small pale spot from anterior end to costal margin and a 

 smaller pale spot at the posterior juncture with the media; cell R5 

 with tliree small round spots in a triangle at end of costa and a small 

 spot near base of cell forming a triangle with the two pale spots at 

 ends of r-m crossvein; apices of veins Mj, M2, M3+4 and Cui each with 

 a small pale spot at wing margin; cell Mi with two oval pale spots, the 

 distal one far from wing margin; one pale spot in distal part of cell 

 M2; a small pale spot in center of cell M4; anal cell with two small pale 

 spots in distal portion and a small pale spot near hind margin at base; 

 cell M2 with small pale spot lying in front of mediocubital fork and 

 one lying behind medial fork. Macro trichia numerous on distal half 

 of wing and on distal part of anal cell; costa extending to 0.68 (0.67- 

 0.71, n= 3) of distance to wing tip. Halter knob infuscated. 



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

 pyriform, large, subequal, collapsed in available specimens and not 

 measured, bases of the ducts not sclerotized. 



Male genitalia: Ninth sternum with a deep caudomedian excava- 

 tion; ninth tergum tapering, with short, pointed apicolateral processes. 

 Basistyle with ventral root foot-shaped, the posterior heel poorly 

 developed, dorsal root slender; dististyle slender with bent, pointed 

 tip. Aedeagus with rather narrow, pointed, basal arch extending to 

 0.8 of total length, the basal arms stout and nearly straight; distal 

 portion a short, rounded, faintly sclerotized blade with a pair of 

 lateral, subapical points. Parameres each with stout basal knob, 

 stem slender, strongly bent at base, sinuate in midportion, abruptly 

 bent at base of tapered distal portion which is narrowed to a fine point 

 with a few very minute, subapical spines. 



Distribution: Panama; Nicaragua (Villa Somoza). 



Panama records: 



BocAS DEL ToRO PROVINCE: Almirante (type locality) . 



