402 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ioj 



environments in the Canal Zone. It superficially r esembles fur en y 

 (Poey) in wing and mesonotal markings but the relationship to 

 jurens is not so close as to alahialinus and gorgasi Wirth and Blanton. 

 Culicoides alahialinus differs in having a very faint wing pattern and 

 fainter mesonotal pattern and lacking the sensoria on segment vii of 

 the antenna; gorgasi differs in its larger size, more prominent mesonotal 

 pattern with yellowish center and also lacking the sensoria on antennal 

 segment vii. Barbosai at times is fairly abundant at some localities 

 in the Bahamas and extreme southern Florida, where it has been 

 confused with furens. 



58. Culicoides gorgasi Wirth and Blanton 



Figure 61 



Culicoides gorgasi Wirth and Blanton, 1953, Journ. Parasit., vol. 39, p. 232 

 (male, female; Panama; fig. wing, mesonotum, palpus, male genitalia). 



Female: Length of wing 1.04 (0.96-1.09, n=10) mm. 



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

 ments in proportion of 23:17:17:17:17:16:16:16:24:24:26:26:37, an- 

 tennal ratio 0.99 (0.94-1.03, n = 5); distal sensory tufts present on 

 segments iii, viii-x, rarely on vii. Palpal segments in proportion 

 of 9:24:25:10:12, third segment moderately swollen, 2.1 (1.9-2.4) 

 times as long as broad, with a small, deep sensory pit. Mandible 

 with 17 (15-19, n=12) teeth. 



Thorax. — Mesonotum pruinose gray-brown with prominent pattern 

 on dark brown punctiform dots at bases of mesonotal hairs, these dots 

 irregularly fused in some areas, principally in two sublateral longi- 

 tudinal bands; an elongate pair of submedian anterior spots yellowish 

 brown. Scutellum narrowly brown in middle, dark brown on sides; 

 postscutellum and pleuron dark brown. Legs dark brown; knee spots 

 blackish; all femora with subapical, all tibiae with subbasal and hind 

 tibia with apical, narrow pale rings; hind tibial comb with four 

 (n=10) spines, the one nearest the spur longest. 



Wing. — Pattern as figured; large yellowish areas at wing base and 

 over r-m crossvein; two longitudinal, elongate poststigmatic pale spots 

 in cell Rs, the anterior one situated entirely distad of the posterior 

 one and sometimes connected to it by a very narrow pale space, distal 

 pale spot in cell R5 usually narrowly connected obliquely distad to 

 anterior wing margin; two small, narrow, elongate pale spots in cell Mi, 

 the distal one sometimes connected by a narrow pale line to a trace of 

 a small pale spot at wing margin; a large pale spot at wing margin in 

 cell M2 and one in cell M4; two pale spots in distal portion of anal 

 cell; cell M with a pale line from base connected to a pale spot behind 

 medial fork and a pale spot lying ahead of broadest portion of cell M4. 

 Macrotrichia numerous on distal portion of wing and in anal cell and 



