268 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i09 



50. Cell Rs with distal pale spot comma-shaped, bearing a small distal 



extension from posterior side 61 



Cell Rs with distal pale spot not appendiculate but quadrate to round 

 or oval in shape 62 



51. Cell Rs with main body of distal pale spot small and transverse; veins 



M3+4 and Cui pale margined in cell M4; pale spot present in cell M2 

 behind medial fork; larger (wing 1.25 mm. long). 



patnpoikilus Macfie (p. 324) 

 Cell Rs with main body of distal pale spot large and rounded; veins 

 M3+4 and Cui not pale margined in cell M4; pale spot absent in cell 

 M2 behind medial fork; smaller (wing 1.02 mm. long). 



commatis, new species (p. 321) 

 52 (50). Cell Rs with distal pale spot filling cell to apex. 



antefurcatus, new species (p. 315) 

 Cell Rs with distal pale spot rounded or quadrate, not extending to 



apex of cell ^^ 



53. Mesonotum yellowish brown with dark ,brown pattern; antenna with 

 sensoria present on segments iii to ix and xi to xv. 



pilosus, new species (p. 332) 

 Mesonotum dark brown with darker brown pattern; antenna with 

 sensoria present on segments iir, v, vii, ix and xi to xv. 



phaeonotus, new species (p. 326) 



54(25). Cell Ml with three pale spots 55 



Cell Ml with two pale spots 60 



55. Cell Rs with three small pale spots arranged in a triangle with apex 



at end of costa and distad with a large, subapical, double spot; cell 

 Ml with small distal pale spot very small at wing margin and usually 

 narrowly connected to large spot in middle of cell; mesonotum with 

 pattern of small punctiform brown dots; branches of media pale- 

 bordered furens (Poey) (p. 404) 



Cell Rs with pale spots arranged differently 56 



56. Cell Rs with three small, rounded pale spots arranged in a triangle 



in distal half of cell 57 



Cell Rs with two pale spots in distal half 58 



57. Cell Rs with three small round pale spots in a triangle at end of second 



radial cell similar to the triangle in distal half of cell; mesonotum 

 with pattern of punctiform brown dots. 



venezuelensis Ortiz and Mirsa (part) (p. 372) 



Cell Rs with two small round pale spots, often partially fused, at end 



of and behind second radial cell; mesonotum with pattern of large 



patches guyanensis Floch and Abonnenc (p. 370) 



58 (56). Cell Rs with four small, round pale spots arranged in a rhomboid in 

 midregion; no small pale spot at apex of cell Rs; anal cell with two 

 distal pale spots; mesonotum with prominent pattern; halter knob 



dark propriipennis Macfie (p. 412) 



Cell Rs with a small round pale spot at apex, as well as other proximal 



pale spots 5 J 



59. Cell Rs with subapical pale spot round or reniform, not attaining wing 

 margin; a double pale spot at end of second radial cell; anal cell with 

 one distal pale spot; mesonotum without prominent pattern. 



paraensis (Goeldi) (p. 440) 



Cell Rs with subapical pale spot irregular, usually extending to anterior 



wing margin; three small round spots beyond and behind second 



