BITING MIDGES — WIRTH AND BLANTON 273 



93 (91). Vein Mi with small pale spot at wing margin; antennal sensoria present 

 on segments iii, vii-x; two sepermathecae present; distal pale spot in 

 Rs with narrow extension to wing margin. 



volcanensis, new species (part) (p. 389) 

 Vein Ml dark to apex or pale margined on distal half 94 



94. Vein Mi pale margined on its distal half; cell Rs with distal pale spot 



entire, not appearing double or divided; antenna with five distal 

 segments not elongated or bearing sensoria; one or two spermathecae. 



95 

 Vein Ml dark to apex; cell Rs with distal pale spot transverse or divided 

 more or less into two separate spots; antenna with five distal seg- 

 ments elongated and bearing sensoria; one spermatheca .... 96 



95. Cell M2 with apical and preapical pale spots broadly connected along 



posterior edge of vein M2; cell Rs with distal pale spot extending 

 broadly to wing margin; two spermathecae. 



balsapambensis Ortiz and Leon (p. 414) 

 Cell M2 with apical and preapical pale spots not connected; cell Rs with 

 distal pale spot not attaining wing margin; one spermatheca. 



castillae Fox (p. 416) 

 96 (94). Cell Rs with distal pale spot oblique and double or completely divided 

 into two separate spots; palpus with round pit; antennal segment x 

 without sensoria; wing not so hairy, base of cell M2 bare. 



transferrans Ortiz (p. 424) 



Cell Rs with distal pale spot transverse and entire; posterior poststig- 



matic pale spot greatly reduced; palpus with irregular pit; antennal 



segment x with sensoria; wing very hairy, with dense long hairs 



extending to base of cell M2 . . . rangeli Ortiz and Mirsa (p. 423) 



Subgenus Culicoides {Hqffmania) Fox 



Culicoides (Hoffmania) Fox, 1948, Proc. Biol. Soc. Washington, vol. 16, p. 21. — 

 Ortiz, 1950, Rev. Sanid. Asist. Soc, vol. 15, p. 437.— Wirth and Blanton, 

 1956, Proc. Ent. Soc. Washington, vol. 58, p. 305. (Type: Culicoides 

 inamollae Fox and Hoffman, by original designation.) 



Species with the second radial cell ending in a pale area; base of 

 cell M4 pale where it borders the veins at the base of the mediocubital 

 fork or with apices of veins Mi, M2, M3+4 and Cuj pale; r-m crossvein 

 often more or less darkened; antennal sensoria present on segments 

 III, xi-xv or III, V, VII, IX, xi-xv; tibial comb with 5-6 spines; male 

 genitalia with the apicolateral processes small or absent, dorsal and 

 ventral roots of the basistyle undeveloped; aedeagus with a proximal 

 barlike sclerotization or marginal band and usually a distal pegw ith 

 a spherical tip. 



There are two distinct groups of this subgenus in Panama: the 

 hylas group (below) and the guttatus group (p. 280). 



The hylas group 



This group consists of large to medium-sized species with base of 

 cell M4 dark where it borders the bases of veins M3+4 and Cui, pale 



