Vol. XXX] ENTOMOLOGICAL, NEWS 203 



6,000 feet on Beaver Creek, Madison County, Montana, in 

 August, 1913. 



The hind femora of S. montanensis and 5^. madisoni resem- 

 ble those of Metoposarcophaga inmrva (Aldrich), but lack the 

 ventral protuberance and brush. 



Sarcofahrtia atlantica n. sp. (Text figs. 5, 6). 

 Holotype (male) ; collection of R. R. Parker. 



Length 6.5 mm. The essential characters for distinguishing this 

 species are as follows : Gena with irregular row of cilia ; second anten- 

 nal segment light colored ; arista pubescent, distal segment slightly 

 bulbous at base ; bend of fourth vein an obtuse angle, thence almost 

 a straight line to the margin ; section VI of costa very short ; scutel- 

 lum with more than four pairs of bristles ; submesotibial bristle absent ; 

 the accessory plate is large and seems to be fused with the second 

 genital segment (Fig. 5). 



Described from one male specimen collected at Hamden, 

 Connecticut, May 22, 191 1, by B. H. Walden. 



This species is markedly different from others of the genus. 



Table of Species. 



1. Hind femur much larger than normal, in profile with ventral 



emargination 2 



Hind femur of normal size and shape 3 



2. Hind femur as in figure 3 ; genital parts as in figure i, 



S. montanensis n. sp. 

 Hind femur as in figure 4; genital parts as in figure 2, 



6". madisoni n. sp. 



3. Arista short plumose, its shape normal ^. ravinia R. Parker 



Arista pubescent, its distal segment slightly bulbous at base, 



S. atlantica n. sp. 



The species herein described as new agree with the generic 

 characters as originally Hsted (Psyche, vol. 23, p. 31, 1916), 

 except that the tibiae are bearded in 5'. montanensis and the 

 genae bear ciHa in S. atlantica. The accessory plates are of in- 

 terest due to their position and shape in montanensis, madisoni 

 and ravinia, and because of their size and apparent fusion with 

 the second genital segment in atlantica. The posterior claspers 

 in all the species are smaller than the anterior pair and are 

 approximated on the median dorso-ventral plane. All the 

 species have a row of strong bristles on the "hump" of the first 

 genital segment, but the posterior marginal bristles ate weak 

 or lacking. 



