March. 1915-] TOWNSEND : New MaSICERATID^ AND DeXIID.E. 65 



Several females taken February 17, 1912, and later, on herbage in 

 valley of the Rio Chira at Sullana, in the northern coast strip of 

 Peru; and both males and females taken the first week in April, 1912, 

 on flowers of Asclcpias citrassavica and Baccharis sp. in the valley of 

 the Rio Casma above Casma town, in the center of the Peruvian 

 coast strip. One of the Sullana females is TD4077 (fly, reproductive 

 system, tgg). 



Family DFXIID.^. 



Subfamily Sardioceratinje. 



PARATHERESIA new genus. 



Allied to Eiithcrcsia and Sardioccra. Description is from the 

 female. Front and face gradually widening from vertex, which is 

 about equal to eye-width. Frontalia much widened on anterior half ; 

 parafrontals of nearly equal width throughout, but a little wider in 

 front than at vertex; parafacials wide, slightly wider than anterior 

 width of parafrontals, bare. A single row of weak frontal bristles 

 stopping at root of antennae ; two proclinate orbital bristles ; a rather 

 short pair of divergent ocellar bristles with other divergent bristles 

 behind them ; a row of microscopic hairs on parafrontals about in line 

 with orbitals and approximated to eyes. Facial plate only a little 

 wider than one parafacial, not constricted below, the epistoma fairly 

 produced, the vibrissa but slightly above oral margin. Facialia bare 

 save about three bristles next vibrissae. Second antennal joint hardly 

 elongate, the third fully twice as long; arista thinly plumose; second 

 antennal joint bearing a long bristle in front. Proboscis when ex- 

 tended about as long as head-height, moderately stout, rather horny 

 but labella well developed; palpi well developed, club-shaped. Cheeks 

 fairly wide, about two fifths of eye-height. Eyes bare. 



Three sternopleural bristles, the middle one weaker; four post- 

 sutural bristles. A short apical decussate pair of scutellar bristles, 

 a pair of separated discal bristles of same strength, and two strong 

 lateral bristles. No macrochaetae on first two abdominal segments 

 except weak lateral ones ; third segment with six strong marginal ones 

 in a median pair and a lateral pair on each side ; fourth segment with 

 a submarginal row of about six weaker ones. Legs moderately 

 slender, normal, claws but little elongate ; hind tibiae faintly short- 



