36 THOMAS SAY FOUNDATION 



costal segment half the fifth; hind crossvein quite 

 straight. 



Female. Front .38 of head; lateral vertical 

 small ; thoracic chaetotaxy as in male, including scutel- 

 lum. General color as in male, but pollen less dense, 

 the abdomen somewhat mottled above; front femora 

 in some cases rather gray or dark in ground color. 



Length of male 7 mm ; of female 8 mm. 



Six males, ten females, Opelousas, La., Marcli 

 and April, 1897, in the Hough collection. They bore 

 the label "Sarcojjhilodes nigrocaudaia Bigot," in Dr. 

 Hough's handwriting. The evident intention was to 

 identify them as Bigot's Mcgerlca rufocaudaia, re- 

 ferred by Coquillett w^ith a doubt to this genus. 

 Brauer after that time ( SitzAingsber. Kais. Akad., 

 cvii, 22) published some notes on the type, which is 

 from Mt. Hood, Ore., and indicated that it nmst be 

 quite different from the present species. 



Holotype and Allotype. — In the Hough collec- 

 tio. Paratypes in U. S. N. M., male and female, Xo. 

 20,487. 



Genus SAROTHROMYIA B. and B. 



Brauer unci von Bergenstamm, Zweifl. Kais. jVIus., v, 365, 

 1 89 1, and vi, 160, 1893. 

 Head of very peculiar shape, the lower edge 

 very long and straight, the metacephalon built out 

 liehind in a lobe partly separated by a groove. Front 

 wide in both sexes, with one orbital in the male, two 

 in the female, the reclinate uppermost frontal in line 

 with tliem and simulating another orbital, and four 

 or five other frontals, wliicli hardly extend below the 

 base of antenme; ocellars strong. Parafacials wide, 

 with scattered minute hairs, those along the facial 

 impression in a delicate row. Outer vertical present 

 in both sexes. Front protuberant at base of antenmT. 

 Antennas as in Sarcophaga, the plumosity of the arista 

 not quite so long. Thoracic cha?totoxy exactly as in 

 Sarcopliagula occidua, except that there is a small 

 third stpl, and the second marginal scutellar pair arc 



