342 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



is also closely related to jamaicensis, but bakeri has the pale spot at 

 the end of vein Mi continued proximad as a pale border to the vein 

 to the pale spot straddling this vein near its base, there is no pale 

 spot at the apex of vein M3+4 and the male parameres are spinose 

 at the tips. 



The iriartei group 



This group consists of small to medium-sized species with moder- 

 ately hairy wings; wing with pale spot present straddling middle of 

 vein M2 and usually with one or two linear pale spots lying in front 

 of vein Mi toward its base; female antenna with sensoria present on 

 segments iii, vii-x; four spines in tibial comb; two spermathecae; 

 male genitalia with ventral root of the basistyle long and curved and 

 foot-shaped with a prominent basal hook, parameres with large basal 

 knob, the base not directed laterad, the apex with fringing spines; 

 aedeagus with bladelike projections on the caudolateral margin 

 of the arch. 



Panama species: Two: evansi, new species, and iriartei Fox. (C. 

 blantoni Vargas and Wirth from Mexico and C. baueri Hoffman from 

 the United States also belong to this group.) 



32. Culicoides evansi, new species 



Figure 35 



Female: Length of wing 1.17 (1.12-1.23, n=10) mm. 



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

 segments in proportion of 18 : 13 : 13 : 14 : 15 : 14 : 14 : 15 :20 :20 :22 : 24 :38, 

 antennal ratio 1.02 (0.90-1 09, n=3); distal sensory tufts present 

 on segments iii, vii-x. Palpal segments in proportion of 10:17:31: 

 10:10, third segment greatly swollen, 2.0 (1.8-2.3, n=10) times as 

 long as greatest breadth, with a very broad, moderately deep, sensory 

 pit. Mandible with 13 (12-14, n = 8) teeth. 



Thorax. — Mesonotum rich chocolate brown, with prominent 

 pattern of pruinose gray patches, consisting mainly of a submedian 

 anterior pair of elongate spots, a pair of similar shape and position in 

 flattened prescutellar area, and several small spots over humeral pits 

 and along lateral margins. Scutellum dark brown in middle, pruinose 

 gray on sides; postscutellum and pleuron dark brown. Legs dark 

 brown; fore and mid 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, pale spot over r-m crossvein narrow 

 but broadening as it reaches costal margin; cell R5 with two double, 

 transverse pale spots, both broadly meeting anterior wing margin, 

 each of these sometimes separated into two distinct small rounded 



