SARCOPHAGA AND ALLIES 143 



two orbitals, and the outer vertical is well developed; 

 genital segment red, the tergal part with long mar- 

 ginal bristles; sternite developed into a short, blunt 

 point, which does not bend forward, and hardly pro- 

 trudes from the abdomen in repose. Middle tibia 

 with a row of three increasing bristles on the outer 

 front side. 



Holotype.— Male, No. 20525, U. S. N. M., 

 from Socorro, N. M. 



No. 64. Sarcophaga aculeata n. sp. 



Male. Like eojcisa except in the following 

 points: Front .166 of head (average of six, which 

 gave .162, .166, .160, .183, .165, and .161); fourth 

 abdominal segment wholly black. Forceps yellow, 

 brown toward apex; concave twice in front in pro- 

 file — once near the middle and again near the apex; 

 behind rather evenly curved nearly to the tip, where 

 they are slightly concave; the tip has a tooth pro- 

 jecting forward; back of forceps rather coarsely 

 spinose; from behind they are moderately diverging 

 with the tips twisted outward. Accessory plate rather 

 long and slender, curved; posterior clasper long, 

 blackened apically, and gradually curved forward; 

 anterior clasper of medium length, black, stout, 

 curved; penis with long yellow basal segment, the 

 distal blackish, flat, normally at a right angle with the 

 preceding; the apical processes are wider than those 

 in angustifrons and vary in the amount of their di- 

 vergence, — in some cases they separate U-shaped and 

 show the central terminal organ much as it appears 

 in angustifrons, in others they touch each other and 

 conceal the organ; on tlie front or inner side of the' 

 segment is a pair of flat pads microscopically denti- 

 culate or granulate anteriorly. Fifth sternite nar- 

 rowly split at the bottom, with a sudden almost square 

 widening before the middle of the fourth tergite, the 

 basal exposed part black, somewhat hairy, the border 

 with pale pubescence, the terminal lobes concealed. 



