344 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



posterior heel small, the toe very long, slender and arcuate; dorsal 

 root relatively stout; dististyle stout and slightly curved with bluntly 

 rounded apex. Aedeagus with basal arch extending to about two- 

 thirds of total length of aedeagus, distal mesal portion not rounded 

 but with cleft continuing nearly to tip of apical portion of aedeagus; 

 basal arms very slender and curved, a pair of short, bladelike processes 

 on shoulders of basal arms; distal tip of aedeagus slender and simple. 

 Parameres each with large basal knob, nearly straight, slender stem 

 without ventral lobe and distal portion abruptly bent ventrad and 

 • •earing a lateral fringe of four large spines and a larger, bent, apical 

 spine. 



Distribution: Panama. 



Specimens examined: Holotype female (USNM 63165), allotype 

 male, Volcdn, Chiriqui Province, Panama, Apr. 17, 1952, F. S. Blanton, 

 light trap. Paratypes, 12 males, 50 females; same data as type, 

 except dates December 1952 and Mar. 25 to Apr. 23, 1954. 



Discussion: The male genitalia of evansi are nearly identical with 

 those of baueri Hoffman from North America and iriartei Fox to which 

 it is closely related. In both the related species there are definite, 

 elongated pale spots lying just in front of vein Mi, there are pale 

 spots at the wing margin at the apices of veins Mi to Cui, and vein 

 M3+4 is pale bordered. In iriartei, moreover, there are pale subapical 

 bands on the hind femur. 



We take great pleasure in dedicating this species, which is presently 

 known only from the Panama Volcdn area, to Mr. Thomas Evans, 

 of the Walter Reed Army Institute of Research. 



33. Culicoides iriartei Fox 



Figure 36 



Culicoides iriartei Fox, 1952, Ann. Ent. Soc. Amer., vol. 45, p. 368 (female; 



La Salina, Venezuela; fig. wing, palpus, spermathecae, tibial comb); 1955, 



Journ. Agr. Univ. Puerto Rico, vol. 39, p. 243 (synonym, vargasi Wirth 



and Blanton). 

 Culicoides baueri Ortiz and Mirsa (misident., not Hoffman), 1952, Rev. Sanid. 



Asist. Soc, vol. 16, p. 599 (male, female; Ocumare, Venezuela; fig. palpus, 



spermathecae, wing, male genitalia). 

 Culicoides vargasi Wirth and Blanton, 1953, Journ. Washington Acad. Sci., 



vol. 43, p. 74 (male, female; Panama; fig. wing, mesonotum, palpus, male 



genitalia) . 



Female: Length 0.93 (0.89-0.92, n = 10) mm. 



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

 segments in proportion of 15 : 12 : 12 : 12 : 12 : 12 : 12 : 12 : 20 :22 : 25 : 28 :36, 

 antennal ratio 1.42 (1.36-1.46, n=7); distal sensory tufts present 

 on segments iii, vii-x. Palpal segments in proportion of 8 : 1 5 : 25 : 9 : 1 1 , 

 third segment swollen, 2.0 (1.9-2.2, n=9) times as long as greatest 



