302 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



a hollowed, open, sensory area on the distal tapering portion. Man- 

 dible with 20 (19-21, n = 8) teeth. 



Thorax. — Mesonotum yellowish brown, becoming blackish at an- 

 terior margin. Scutellum concolorous with mesonotum; postscu- 

 tellum and pleuron brown. Legs yellow, broad base of fore femur and 

 apex of fore tibia brownish; hind tibial comb with six spines, the second 

 from the spur longest. 



Wing. — -Pattern as figured, appearing pale yellowish with restricted 

 dark spots and areas, pale spots in apices of cells R5 and Mi not meet- 

 ing wing margin. Macrotrichia confined to a few in apices of cells 

 R5, Ml and M2; costa extending to 0.68 of wing length. Halter 

 yellowish white. 



Abdomen. — Dark brown. Spermathecae two, pyriform, subequal, 

 each measuring 0.058 by 0.043 mm. 



Male genitalia: Ninth sternum relatively broad, with broad 

 caudomedian excavation extending about halfway to base; ninth ter- 

 gum short and tapering, apex broad and truncated, with long, slender, 

 apicolateral processes. Basistyle with ventral roots short and blunt, 

 dorsal root longer and slenderer, mesal surface with small, spinose 

 setae. Aedeagus broad at base, sclerotized membrane present be- 

 tween basal arms on distal half of arch, with indistinct anterior band ; 

 distal portion with long, slender, internal peg and slender, spherical 

 tip. Parameres separate, each with abruptly bent, thickened base, 

 slender, straight stem and gradually ventrally curved, pointed, hairy 

 tip. 



Distribution: Panama. 



Panama records: 



CocL:fi Province: El Valle. 



Panama Province: Cerro Campana (type locality). 



Discussion: This species closely resembles ejfferus Fox in its pale 

 legs and wings, yellowish mesonotum, and long proboscis, but it is a 

 smaller species and has the third palpal segment stouter without 

 definite pit and the male genitalia are much different. 



14. Culicoides marshi Wirth and Blanton 



Figure 17 



Culicoides marshi Wirth and Blanton, 1956, Proc. Ent. Soc. Washington, vol. 58, 

 p. 220 (female; Panama). 



Female: Length of wing 1.08 (L06-1.12, n = 5) mm. 



Head. — Eyes bare, broadly contiguous. Antenna with flagellar 

 segments in proportion of 30:21 : 22: 22: 22: 22: 22: 22: 25: 25:31 : 33: 50, 

 antennal ratio 1.18; distal sensory tufts present on segments iii, xi-xv. 

 Palpal segments in proportion of 10:31:40:16:13, third segment very 

 slender, 3.5 (3.1-3.9, n=2) times as long as greatest breadth, with 



