CERATOMYIELLA AND PARADIDYMA EEINHARD 23 



face, third segment black, about as wide as parafacial below and 

 only slightly more than twice the length of second which is yellow; 

 arista blackish, thickened on about basal fourth, penultimate segment 

 as wide as long; palpi pale yellow, slender; proboscis short, labella 

 fleshy ; eyes sparsely short haired ; back of head gray poUinose, mod- 

 erately clothed with pale hairs. 



Thorax black, thinly gray pollinose; mesonotum with four black 

 stripes obliterated behind suture where the surface is subshining in 

 most views; scutellum black, almost shining but lightly dusted with 

 uniform grayish pollen; chaetotaxy as in validine7'vis, but with only 

 two sternopleural bristles; postscutellum normal; no infrasquamal 

 hairs; calypters white. 



Abdomen black, rather broad and flat above; last three segments 

 with silvery bands on basal fifth, the remainder of these segments 

 including the first polished or shining; first segment without median 

 marginals; second with one pair, small; third also with a median 

 pair, a wide space intervening between these and the next ones sit- 

 uated near the sides of the segment; fourth bearing a row of rather 

 strong discals besides a row of somewhat weaker marginal bristles; 

 hairs on intermediate segments depressed. 



Legs black, trochanters yellow, coxae less distinctly so ; front tarsal 

 segments not laterally compressed, the claws and pulvilli small but 

 distinct. 



Wings grayish hyaline; third vein bristly two-thirds the distance 

 to small cross vein; hind cross vein unusually oblique to fourth, join- 

 ing it nearer bend than small cross vein ; apical section of fifth vein 

 one-half the length of preceding section ; fourth vein with a rounded 

 obtuse stumpless bend, curving outward shortly beyond, thence 

 almost straight to costa; apical cell very narrowly open shortly 

 before extreme tip of wing; costal spine small. 



Length. — 4 mm. 



Male. — Unknown. 



Type.— Female, U.S.N.M. no. 44760. 



Remarks. — Described from one female specimen in the United 

 States National Museum, collected by W. Carter, labeled " S. pestifer, 

 Salmon River Crossing, Idaho, August 31, 1927." 



This species, like P. setigera, has almost normally developed fore 

 tarsal claws and pulvilli, but differs in the more oblique hind cross 

 vein and the extremely narrow pollen bands on last three abdominal 

 segments. There are other minor differences. 



(8) PARADIDYMA NEOMEXICANA, new species 



Male. — Front before triangle 0.258 of the head width in the one 

 specimen ; paraf rontals gray pollinose to vertex, clothed with moder- 



