CEEATOMYIELLA AND PAEADIDYMA EEINHARD 29 



hairs on lower extremity; cheek bare above the lower margin, gray 

 pollinose, about two-fifths the eye height; antennae as long as face, 

 first segment rather prominently elevated above the front, third seg- 

 ment about five times longer than second; arista black, thickened 

 nearly to middle, proximal segments short but distinct; palpi slen- 

 der, pale yellow ; beard white ; eyes distinctly hairy. 



Thorax and scutellum black, densely gray pollinose; three pairs 

 of acrostichal bristles behind the suture, the median ones very weak 

 or hairlike; other details of chaetotaxy as in validinervis ; infra- 

 squamal hairs present; postscutellum gray pollinose, membranous 

 above; calypters semitransparent, white. 



Abdomen black, wholly gray pollinose; first segment without 

 median marginals; second with a stout closely spaced pair; third 

 with a marginal row of about 10; fourth bearing a complete row 

 of good-sized discals, besides a row of still larger marginals ; genital 

 segments reddish black, lightly pollinose, fifth sternite deeply 

 divided, the lobes blackish, clothed with fine hairs. 



Legs mostly black, the basal segments and the hind tibiae obvi- 

 ously reddish (front pair missing) ; claws and pulvilli elongate. 



Wings subhyaline; venation normal; apical cell open well before 

 tip of wing; costal spine large; epaulets red. 



Length. — 8.5 mm. 



Female. — Unknown. 



Type.—^inlQ, U.S.N.M. no. 44766. 



Remarks. — Described from one male labeled "Animas Park, N.Mex., 

 6,500 feet (Townsend)." 



(14) PARADIDYMA APERTA Brauer and Bergenstamm 



Paradidyma aperta Brauer and BnaiGENSTAMM, Die Zweifliigler des kaiser- 

 lichen Museums zu Wien, no. 6, p. 187, 1893. 

 Microchira mexicana Br.vx;er and Bergenstamm, Ibid., p. 188. 



Readily distinguished from all other known species by the golden 

 pollen on the head. I have not seen any male specimens. 



Female. — Front at extreme vertex 0.312 of the head width (one 

 specimen) ; pollen deep golden-yellow on parafrontals, parafacials, 

 cheeks, and posterior orbits; face yellowish gray; outer verticals 

 about half the size of inner ones; orbitals, two pairs; ocellars pro- 

 clinate; frontals extending to apex of second antennal segment, 

 directed inward, except the uppermost, which is reclinate ; paraf acial 

 on narrowest part about one-half the width of facial depression, 

 bearing a row of rather weak bristles and with black hairs on entire 

 length outside the main row ; vibrissae situated on front edge of 

 mouth; facial ridges with one or two bristles and fine hairs next 

 to vibrissae; cheek fully one-half the eye height; palpi yellow; 



