390 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



brown below. Legs dark brown, femora with subapical, tibiae with 

 subbasal and hind tibia with apical, narrow pale rings; knee spots 

 blackish; hind tibial comb with four spines, the one nearest the spur 

 longest. 



Wing. — Very long and narrow, four times as long as broad; with 

 pattern as figured; pale areas of wing few and not prominent; second 

 radial cell very dark; pale area over r-m crossvein continued in full 

 breadth to costal margin; two well -separated, round, pale, poststig- 

 matic spots in cell R5, the posterior one located slightly proximad of 

 the other; distal pale spot in cell R5 small and oblique, meeting wing 

 margin in slightly reduced breadth; apex of vein Mj with a pale spot 

 at wing margin; cell Mj with two small pale spots, the distal one 

 elongate and not quite meeting wing margin; two pale spots in distal 

 portion of cell M2, the proximal one very small and faint, the distal 

 one lying at wing margin; large pale spot in cell M4; a single, large 

 double pale spot in distal portion of anal cell; a pale spot in cell M2 

 lying in front of mediocubital fork and one lying behind medial fork; 

 a pale spot over basal arculus. Macrotrichia sparse over distal half 

 of wing and a few in middle of anal cell; costa extending to 0.61 of 

 distance to wing tip. Halter yellowish, base of the knob infuscated. 



Abdomen. — Dark brown. Spermathecae two, collapsed in single 

 slide specimen and not measured, apparently subequal and pyriform, 

 with the bases of the ducts sclerotized a short distance. 



Male: Unknown. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63168), 1 female 

 paratype, Volcan, Chiriqui Province, Panama, May 28, 1954, G. 

 Field, light trap. 



Discussion: This is such a distinctive species that we do not hesi- 

 tate to describe it as new from two specimens, one pinned (holotype) 

 and the other mounted on a slide. The large size, elongated, convex 

 mesonotum, striking yellowish and brown markings of the thorax and 

 legs, the sensorial pattern, palpal structure and number of mandibular 

 teeth seem to ally this species with dicrourus Wirth and Blanton, 

 avilaensis Ortiz and Mirsa, and discrepans Ortiz and Mirsa. These 

 three species, however, all have more extensive pale wing markings, 

 a large area at wing base pale, the penultimate spot in cell M2 well 

 developed, the pale spot in the distal part of the anal cell more nearly 

 or distinctly separated into two separate pale spots and the wing 

 much hairier. C. discrepavs is a much larger species (wing 1.9 mm. 

 long) and avilaensis and dicrourus are smaller (wing 1.1-1.3 mm. 

 long) than volcanensis. 



