CEEATOMYIELLA AND PARADIDYMA REINHARD 25 



From the other forms having the hind cross vein retracted, the 

 present species may be separated by the following characters : Male 

 with three pairs of well-developed presutural acrostichals; female 

 with distinct fore tarsal claws and piilvilli; and the abdomen more 

 extensively pollinose in both sexes. 



(9) PARADIDYMA DERELICTA, new species 



Male. — Front narrowed before vertex, at narrowest part 0.238 of 

 the head width in one specimen; parafrontals densely gray pollinose 

 to vertex, sparsely haired outside of frontal rows; median stripe 

 reddish brov/n, at antennae about as wide as one parafrontal, verti- 

 cals one pair (inner) developed; f rentals ordinary in size, uppermost 

 bristle reclinate and hardly stouter than the preceding one ; sides of 

 face densely gray pollinose, bare outside the main row of bristles, 

 which become longer and stouter downward; antennae black, third 

 segment five times the length of second; arista thickened hardly to 

 middle; palpi dark brown; cheek nearly one-half the eye height^ 

 thickly clothed with hairs on lower margin. 



Thorax black, covered with gray pollen, which on the mesonotum 

 has a brownish sheen in certain lights; dorsal vittae four, outer 

 pair interrupted at the suture; scutellum black, grajnsh pollinose; 

 calypters tawny. 



Abdomen black ; pollen on intermediate segments with a brownish 

 tinge apparent in most views; narrow hind margin of third and 

 apical half of fourth segment subshining; first segment without 

 median marginals; second with one pair; third bearing a marginal 

 row of about eight ; fourth with a row of discals, which are obviously 

 stouter than the marginals ; genital segments black. 



Legs black; pulvilli tawny. 



Wings grayish hyaline; hind cross vein noticeably retracted and 

 sinuous; last section of fifth vein one-half as long as the preceding 

 section; third vein setulose almost to small cross vein; apical cell 

 narrowly open, reaching costa well before extreme wing tip; costal 

 spine developed; epaulets black. 



Length. — 7 mm. 



Female . — Unkn owm . 



Ty^^.— Male, U.S.N.M. no. 44762. 



Remarks. — Described from one male in the United States National 

 Museum taken at Mound Valley, Chihuahua, Mexico, August 23, 

 1909, by Dr. C. H. T. Townsend. 



Differs from P. validinervis, which it closely resembles, in the ab- 

 sence of median marginals on first abdominal segment, and in having 

 the hind cross vein of wing noticeably retracted. There are other 

 minor differences. 



73007—34 3 



