BITING MIDGES — WIRTH AND BLANTON 



389 



antennal sensoria only on segments iii, viii-x, palpal segments iv 

 and V combined are only 0.88 as long as iii and the sensory pit on the 

 third palpal segment is deeper with a narrower opening. C. avilaensis 

 has the pale wing spots even more reduced than in discrepans. 



52. Culicoides volcanensis, new species 



Figure 55 



Female: Length of wing 1.45 mm. 



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

 segments in proportion of 30:24:24:25:25:26:24:24:33:35:41:43:65, 

 antennal ratio 1.07; distal sensory tufts present on segments in, 

 vii-x. Palpal segments in proportion of 9:15:30:7:10, thu'd segment 

 moderately swollen, 2.1 times as long as greatest breadth, with a 

 broad, shallow sensory pit. Mandible with 13 teeth. 



Thorax. — Mesonotum slender and long, very convex on front por- 

 tion; color a deep chocolate brown, anterior margin blackish, with a 

 submedian anterior pair of elongate spots, a prescutellar area, two 

 small spots in area of humeral pit and three small lateral spots on each 

 side yellowish. Scutellum broadly dark brown in middle, yellowish 

 on sides; postscutellum dark brown, pleuron j^ellowish above, dark 



Figure 55. — Culicoides volcanensis, new species. Female: a, wing; b, thoracic pattern; c, 

 tibial comb; d, spermathecae; e, palpus. 



