316 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



Thorax. — Mesonotum pruinose yellowish gray, with a brown pattern 

 consisting of a very fine median line from anterior margin to scutellum 

 and a pair of sublateral longitudinal bands. Scutellum brown; 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 4-5 (n=2) spines, the one nearest the spur 

 longest. 



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

 pale spot over r-m crossvein large, broadly meeting costal margin; 

 poststigmatic pale spot in cell R5 double and oblique, the posterior 

 part slightly larger; distal pale spot in cell R5 elongate longitudinally, 

 filling apex of cell R5 ; pale spot present straddling middle of vein M2 ; 

 distal pale spots in cell Mi and cell M2 broadly meeting wing margin; 

 pale spot in cell M4 large and rounded, nearly filling cell; a large 

 double spot in distal part of anal cell broadly reaching posterior wing 

 margin, base of anal cell with large pale area; cell M2 at base with a 

 linear streak which extends to the pale spot straddling middle of vein 

 M2, a pale spot present lying in front of mediocubital fork. Macro- 

 trichia sparse but well distributed, extending nearly to bases of cell 

 M2 and anal cell; costa extending to 0.58 (n=2) of distance to wing 

 tip. Halter yellowish. 



Abdomen. — Dark brown, proximal terga pale. Spermathecae two, 

 subequal, pyriform, bases of the ducts not sclerotized, collapsed and 

 not measured in available specimens. 



Male genitalia: Ninth sternum without apparent caudomedian 

 excavation; ninth tergum with long, pointed, apicolateral processes, 

 Basistyle with ventral root very fine-pointed, dorsal root longer and 

 slender; dististyle with bent, slender, pointed apex. Aedeagus with 

 basal arch extending to nearly half of total length, the basal arms stout 

 and nearly straight; distal portion stout and tapered to broad, trun- 

 cated tip. Parameres each with very small basal knob bearing a 

 slender anterior process, stem slender at base, mid portion swollen 

 basally, then gradually tapered to abruptly bent, slender, simple point. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63158), allotype 

 male, Almirante, Bocas del Toro Province, Panama, November 1952, 

 F. S. Blanton, light trap. Paratypes, 2 males, 4 females: 4 females, 

 Almirante, December 1952 to March 1953; 1 male, Mojinga Swamp, 

 Canal Zone, Oct. 24, 1951 ; 1 male, Cerro Campana, Panamd Province, 

 September 1952. 



Discussion: This species superficially resembles tenuilobus, new 

 species, in general facies and wing markings, both having a large 

 apical pale spot in cell R5, a pale spot at wing margin in cell Mi and a 

 pale spot straddling vein M2, but tenuilobus belongs to the limai 



