116 INSECUTOR INSCITI^ MENSTRUUS 



Types, two males, paratypes, four males and five females. 

 No. 24158, U. S. Nat. Mus. ; Escasu, Costa Rica, February 7, 

 1931, and Tiribi, Costa Rica, January 7, 1931 (A. Alfaro) ; 

 also Rio Ciruelas, Costa Rica, April 10, 1931 (A. Alfaro). 



Sabethoides nitidus Theobald. 



Sabethes nitidus Theobald, Mon. Culic, ii, 347, 1901. 

 Sabethoides nitidus Howard, Dyar & Knab, Mosq. No. & Cent. 



Am. & W. I., iii, 37, 1915. 

 Sabethoides nitidus Bonne-Wepster & Bonne, Ins. Ins. Mens., ix, 



2, 1921. 



Male. Proboscis long, straight, slender, not swollen at the 

 tip, white below for three-fourths its length. Palpi very short, 

 exceeding the clypeus by about its own length. Antennae as 

 in the female. Femora more broadly white beneath than in 

 the female on fore legs, the mid-femora white at base and 

 with a bright white area beneath at tip occupying about one- 

 fourth of the joint; first mid tarsal white below; second joint 

 white all around, except for a narrow black dorsal line run- 

 ning two-thirds the length of the joint; third tarsal white at 

 base, the upper side black at tip, the black area beginning as a 

 dorsal line and widening to enclose the whole joint at tip. 



Hypopygium. Side piece elliptical, flattened, concave, 

 strongly chitinized on the edges ; three setae within ; a rounded 

 triangular plate toward the tip, bearing two setae and a tooth 

 (PI. II, fig. 7). Clasper with slender column, triangularly 

 widened and divided into five arms, the supporting limb chiti- 

 nized ; first arm small, slender, recurved, spinose ; second stout, 

 with pointed curved tip, three setae and a short beard ; third 

 transverse, long, bar-like, angled outwardly like a bird's wing, 

 bearing long fimbriate cilia throughout ; fourth thick, capitate, 

 rugose at tip, bearing inwardly three club-shaped filaments 

 and a pointed one ; fifth slender, rod-like, with two groups 

 of long curved cilia at its apex (PI. II, fig. 8). Tenth stern- 

 ites with rod-like chitinized edge and dentate tip. Aedoeagus 

 of two paired appendages, toothed at tip, the smaller pair with 

 a plate behind each, giving rise to a triangular-tipped filament. 

 Ninth tergites each with six stout setae with expanded tips. 



