10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



second radial cell, antennal sensoria usually on segments m, xi-xv, 

 the hind tibial comb with 5-6 spines, and 2 well-developed sperma- 

 thecae present. 



Covagarciai Group 



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

 yellow or with the knees broadly yellow banded; scutum yellowish to 

 brown, subshining; base of cell M4 dark at the base of the medio- 

 cubital fork, and apices of veins Ml, M2, M3+4 and Cul always 

 dark; eyes contiguous, bare; male genitalia with basistyles mesally 

 spinose, apicolateral processes of the ninth tergum developed to vary- 

 ing degrees, and variable development of lobes or a cleft on the caudal 

 margin between them. There are five previously described species 

 found in Central America and northern South America. 



Culicoides popayanensis Wirth and Lee, new species 



Figure 3; Plate 1 (fig. 4) 



Female.— Length of wing 2.16 (1.90-2.43, n=14) mm. 



Head: Eyes (fig. 36) bare, contiguous for a distance equal at least 

 to the diameter of 3 facets. Antenna (fig. 3a) with lengths of flagellar 

 segments in proportion of 32-28-30-31-33-30-28-28-30-34-40-46-68, 

 antennal ratio 0.86 (0.82-0.91, n==3); distal sensory tufts present on 

 segments in, xi-xv, 5-7 sensoria on distal half of xv; antenna brown- 

 ish in-x with extreme bases of segments pale. Palpal segments (fig. 

 3c) with lengths in proportion of 12-32-40-19-19; third segment 

 moderately swollen in midportion 3.9 (3.6-4.5, n=14) times as long 

 as greatest breadth, with an open irregular pit subapically. Proboscis 

 moderately long, P/H ratio 0.88; mandible with 19 (16-21, n=28) 

 teeth. 



Thorax: Brown, scutum with a submedian pair of large yellowish- 

 brown patches on discal area. Legs brown; knees and distal fourth of 

 femora yellow, narrow base of foretibia and approximately basal 

 halves of mid- and hind tibiae yellow, hind tibia with broad apex 

 pale; hind tibial comb (fig. 2>e) with 6 spines, the second from the spur 

 longest. 



Wing (pi. 1: fig. 4): Pattern as figured; pale spots extensive with a 

 yellowish tint; anterior margin with 3 very dark areas; wing base 

 pale for a distance of approximately one-third the length of medial 

 stem; broad yellowish pale spot over r-m crossvein, broadly meeting 

 costal margin and extending narrowly into cell M2; poststigmatic 

 pale spot involving distal two-thirds of second radial cell, extending 

 distally only slightly past it into cell R5, barely touching vein Ml 

 posteriorly, branches of media and cubitus with apices dark at wing 

 margin; a moderately large pale area straddling vein M2 just proximad 



