BITING MIDGES — WIRTH AND BLANTON 271 



Eyes separated by a parallel-sided space; antennal ratio 0.84; third 

 palpal segment 1.8 times as long as broad; 13 mandibular teeth; male 

 aedeagus with truncated, simple apex, ninth tergum with small 



apicolateral processes spurius, new species, (p. 433) 



77 (60). Distal pale spot in cell Mi broadly reaching wing margin 78 



Distal pale spot in cell Mi not reaching wing margin, or if connected to 

 margin by a narrow pale line, the mesonotum with punctiform brown 

 dots 83 



78. Distal part of anal cell with one definite pale spot located far from wing 



margin; mesonotum uniformly pruinose brown, without prominent 



pattern 79 



Distal part of anal cell with two, partially coalesced pale spots, the 

 posterior one broadly meeting wing margin; mesonotum with or 

 without pattern 80 



79. Femora stout; second radial cell long with broad lumen, over twice as 



broad as long; costa extending to 0.78 of wing length; antennal ratio 



0.61 caprilesi Fox (p. 456) 



Femora slender; second radial cell short, costa extending to 0.61 of 

 wing length; antennal ratio 0.95 wokei Fox (p. 363) 



80. Small pale brown species with poorly marked wing, mesonotum and 



legs; femora stout; second radial cell long with broad lumen, over 

 twice as long as broad; costa extending to 0.69 of wing length; 



antennal ratio 1.25 almirantei, new species (p. 454) 



Well-marked, yellow and dark brown species with femora slender; 

 second radial cell less than 1.5 times as long as broad 81 



81. Cell Rs with a large U-shaped poststigmatic pale spot cutting off an 



isolated small round dark spot behind second radial cell; large, 

 slender, yellowish brown species with conspicuous brown mesonotal 

 pattern with large yellowish patches (wing 1.14 mm. long) 



dicrourus Wirth and Blanton (part) (p. 386) 



Cell Rs without an isolated small, round dark spot behind second radial 



cell; smaller, stouter species with yellowish mesonotum bearing a 



pair of brown bands (wing 0.80-0.83 mm. long) 82 



82. Hind femur with narrow subapical and hind tibia with broad apical 



pale rings litnai Barretto (part) (p. 352) 



Hind femur and tibia entirely dark on apices 



galindoi Wirth and Blanton (part) (p. 349) 



83 (77). Cell Rs with a U-shaped pale spot enclosing a small round dark spot 



behind second radial cell and larger, irregularly rounded, pale 



subapical spot broadly attaining wing margin; mesonotum bluish 



pruinose on sides; halter knob dark 84 



Cell Rs without complete U-shaped pale spot enclosing a small round 

 dark spot behind second radial cell; veins Mj and M2 entirely dark 

 except possibly for small pale spots at wing margin or a line bordering 



distal fourth of vein Mi only 85 



84. Veins Mi and Mj both pale bordered on distal fourth; mesonotum with 

 submedian anterior pale spots contrasting yellowish, lateral spots 

 bluish mojingaensis Wirth and Blanton (p. 379) 



Vein Ml only with a pale border on distal fourth, vein M2 dark to apex; 

 mesonotum with submedian as well as the lateral spots bluish 

 pruinose azureus, new species (p. 377) 



