422 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



Thorax. — Mesonotum pruinose brown, with large dark brown patches 

 as figured. Scutellum dark brown broadly in middle, sides narrowly 

 yellowish. Legs dark brown; fore and mid femora with subapical 

 and all tibiae with subbasal narrow pale rings; hind tibial comb with 

 four (n = 5) spines, the one next to the spur longest, very long, a third 

 as long as basitarsus. 



Wing. — Pattern as figured; poststigmatic pale spots broadly con- 

 nected, the posterior one slightly larger and slightly proximad of the 

 anterior one; pale spot in apex of cell R5 large and transverse, not 

 meeting wing margin; two pale spots in cell Mi, only one spot in 

 apex of cell M2, anal cell with single distal pale spot which broadly 

 reaches wing margin, pale spots present lying behind medial fork and 

 in front of mediocubital fork. Macrotrichia long but only moderately 

 dense on distal half of wing, a few in anal cell; costa extending to 

 0.64 (0.61-0.67, n = 6) of distance to wing tip. Halter yellowish. 



Abdomen. — Dark brown, cerci yellowish. Spermatheca one, pyri- 

 form, measuring 0.051 by 0.041 mm. 



Male genitalia: Ninth sternum with a deep caudomedian exca- 

 vation; ninth tergum long and broad at apex, with short, blunt, tri- 

 angular apicolateral processes. Basistyle with ventral and dorsal 

 roots long and slender, subequal, no heel-like expansion on ventral 

 root; dististyle long, slender and gently curving. Aedeagus with long, 

 slender, slightly curved basal arms, the apex of the mesal arch nar- 

 row, distal portion tapering to a very slender apical point. Para- 

 meres each with heavy basal knob, stem slender and curved, bearing 

 a well-developed ventral lobe, the slender, recurved distal portion 

 with a lateral fringe of barbs and tapering gradually to a sharp point. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63170), allotype 

 male, Cerro Campana, Panamd Province, Sept. 19, 1951, F. S. Blan- 

 ton, light trap. Paratypes, 6 males, 60 females: 3 males, 1 female, 

 Cerro Campana, Aug. 3, 1951, and 2 males, 17 females, Sept. 19, 

 1951; 36 females, Almirante, Bocas del Toro Province, October, 

 November 1952, January, March 1953; 1 male, 4 females, Mojinga 

 Swamp, Canal Zone, Oct. 24, Dec. 10, 1951; 2 females, Garachin^, 

 Darien Province, February 1953. 



Discussion: The elongated five distal antennal segments, some 

 bearing sensoria, the hairy eyes, and the single spermatheca ally 

 patulipalpis with transferrans Ortiz and rangeli Ortiz and Mirsa. 

 The last two species have hairier wings with two distinct pale spots 

 in the distal part of the anal cell; moreover, transferrans differs in hav- 

 ing a very contrasting mesonotal pattern, palpus with definite pit, 

 sensoria lacking on antennal segment x and the pale spots in cell R5 

 often separated into four separate spots, while rangeli has a palpus 



