CEKATOMYIELLA AND PARADIDYMA REINHAED 31 



margin; parafacials blackish, covered with feebly shining gray 

 pollen, bare below arista, except a row of weak bristles along inner 

 margin which are reduced in size to small hairs on the upper part; 

 palpi yellow, slender to tip; cheek one-third to two-fifths the eye 

 height; eyes sparsely short haired; back of head gray pollinose, 

 moderately clothed with whitish hairs. 



Thorax black, gray pollinose; mesonotum with four black stripes, 

 which are sometimes indistinctly separated behind the suture; scu- 

 tellum black, lightly sprinkled with changeable gray pollen, post- 

 scuteilum normal, thinly pollinose ; inf rasquamai hairs absent in two 

 specimens and three hairs present in the other; calypters pale 

 yellowish white. 



Abdomen shining black ; intermediate segments with silvery bands 

 on basal third, the fourth thinly pollinose almost to apex; first seg- 

 ment without median marginal bristles ; second with one pair ; third 

 and fourth each bearing a marginal row ; fourth without discals, the 

 broad basal margin above destitute of hairs. 



Legs black ; front tarsi compressed and swollen, the claws and pul- 

 villi very minute. 



Wings brown, paler on the posterior margin; apical cell open 

 shortly before wing tip; venation normal; third vein setulose half 

 to three-fourths the distance to small cross vein ; costal spine longer 

 than small cross vein; epaulets black. 



Length. — 7 mm. 



Male. — Unknown. 



Type.— Female, U.S.N.M. no. 44767. 



Remarks. — Described from three female specimens in the United 

 States National Museum as follows: 1 (the type), taken at Ingenio 

 R.R. Station, Guatemala, April 28, 1926, by Dr. J. M. Aldrich, in 

 whose honor the species is named ; 1, labeled San Rafael, Vera Cruz 

 (C. H. T. Townsend), and the other, Higuito, San Mateo, Costa 

 Rica (Pablo Schild). 



The species has the eyes less distinctly haired and smaller para- 

 facial bristles than any other member of the genus. It is provision- 

 ally included here. The accumulation of better preserved speci- 

 mens, including the male sex, seems necessary to decide the question 

 of proper generic allocation. The relationship with Ceratomyiella 

 seems close, but the type species of that genus has the eyes entirely 

 bare. 



(16) PARADroYMA PERUANA (Townsend) 



Diaphoropeza peruana Townsend, Proc. U. S. Nat. Mus., vol. 43, p. 308, 1912. 



Very similar to P. singularis, from which it differs in the following 

 characters : 



