BITING MIDGES — WIRTH AND BLANTON 339 



erally directed, basal knob; base of stem not greatly swollen, stem 

 gradually tapered to very slender, filiform, simple, twisted tip. 



Distribution: Mexico; Guatemala; Honduras (Lancetilla) ; Nica- 

 ragua (Villa Somoza) ; Panama. 



Panama records: 



BocAS DEL ToRO PROVINCE: Almirante. 



Canal Zone: Fort Davis, Fort Sherman, Mindi Dairy, Mojinga Swamp. 



CocL:fi Province: El Valle, Rio Hato (type locality of hertigi). 



Los Santos Province: La Palma, Las Tablas. 



Panama Province: Cerro Campana, Isla Taboga. 



Discussion: Except for the difference in the extent of the pale' spot 

 in front of {cacozelus) or straddling (poikilonotus) the base of vein M2, 

 cacozelus seems to be identical with 'poikilonotus. A few specimens with 

 poikilonotus wing markings are present in the series from Almirante as 

 well as the series studied from Yepocapa, Guatemala, along with the 

 much commoner and more widespread cacozelus type. At the time 

 we described hertigi we were not sufficiently familiar with the Mexican 

 species, but we now are convinced of the synonymy. The great re- 

 duction in the mandibles, as well as the wing pattern and antennal and 

 palpal structure, ally poikilonotus with panamensis Barbosa, which, 

 however, can readily be recognized by the pale spots straddling veins 

 Ml and M2 and by the very unequal, retort-shaped spermathecae. 



31. Culicoides jamaicensis Edwards 



Figure 34 



Culicoides loughnani var. jamaicensis Edwards, 1922, Bull. Ent. Res., vol. 13, p. 

 165 (female; Jamaica; fig. wing). — Hoffman, 1925, Amer. Journ. Hyg., vol. 5, 

 p. 283 (Canal Zone). — Barbosa, 1947, Anais Soc. Biol. Pernambuco, vol. 7, 

 p. 21 (Jamaica, St. Croix, Panama; fig. male genitalia). — Macfie, 1948, Ann. 

 Trop. Med. Parasit., vol. 42, p. 80 (Chiapas, Mexico; female descriptive 

 notes).— Fox, 1949, Bull. Brooklyn Ent. Soc, vol. 44, p. 32 (Puerto Rico; 

 fig. female palpus, mesonotum, male genitalia). 



Culicoides jamaicensis, Wirth, 1955, Proc. Ent. Soc. Washington, vol.57, p. 112 

 (Guatemala; fig. male genitalia). 



Female: Length of wing 0.97 (0.89-1.06, n=16) mm. 



Head. — Eyes narrowly separated, bare. Antenna with flagellar seg- 

 ments in proportion of 16 : 10 : 1 1 : 12 : 12 : 13 : 14 : 14 :20:21 : 21 : 22 :30, an- 

 tennal ratio 1.21 (1.12-1.32, n = 8); distal sensory tufts present on 

 segments III to XV. Palpal segments in proportion of 10:20:37:10:10, 

 third segment very large and swollen to apex, 2.2 (1.9-2.3, n=16) 

 times as long as greatest breadth, with a very large, deep, sensory pit 



