24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



guished by the frontal bristles, which extend remarkably far down 

 on the paraf acials ; and both genera differ from Exoristoides in hav- 

 ing the eyes smaller and cheek wider, as well as in lacking any hairs 

 on the first vein. In the single known specimen of Exoristopsis 

 both pteropleurals are broken off, but the large scars are present. 



Three species were originally included, johnso7ii, slossonae, and 

 harringtoni, of which the last has been removed as type species of 

 the genus Homalactia Townsend. 



KEY TO SPECIES OF EXORISTOIDES 

 MALES 



1. Third antennal joint very wide, two-thirds as wide as long, with 



obliquely truncate apex (North Carolina to Louisiana and 



California) johnsoni Coquillett 



Third antennal joint less than half as wide as long 2 



2. First vein with few setules, rarely none ; fourth abdominal seg- 



ment wholly black (New Hampshire to Alabama) slossonae Coquillett 



First vein with complete series of setules from near humeral 



cross vein (Trinidad, West Indies) uricM, new species 



FEMALES 



1. First vein setulose from near humeral cross vein to tip 2 



First vein with only a few setules, at most on basal half 3 



2. Third antennal joint concave on front edge, widened at tip. 



urichi, new species 

 Third antennal joint straight, not widened apically (Peru). 



setifera Townsend 



3. Sternopleurals two ; fourth abdominal segment red jolinsoni Coquillett 



Sternopleurals three ; fourth abdominal segment wholly black. 



slossonae Coquillett 



EXORISTOIDES JOHNSONI Coquillett 



Exoristoides johnsoni Coqihixett, Revision of the Tachinidae of America north 

 of Mexico, p. 91, 1897. — Walton, Proc. Ent. Soe. Washington, vol. 17, p. 97, 

 1915.— Bbimlet, Ent. News, vol. 33, p. 22, 1922. 



The material in the National Museum at present referred to this 

 species is the following: Holotype, female, Hertford County, N. C. 

 (collection Coquillett) ; one female, Raleigh, N. C. (Brimley) ; one 

 female, Palo Alto, Calif. (W. F. Derby coll., through the Aldrich col- 

 lection) ; one female, Opelousas, La. (Pilate) ; one female, Lindsey, 

 Calif. (McGregor) ; one dwarf male, reared at Capa, S. Dak., from 

 Gryllus abhreviatus Serville, by Prof. H. C. Severin, emerged Sep- 

 tember 12, 1919; two males and one female, reared at Sacramento, 

 Calif., from Gryllus assim'dis Fabricius, by C. C. Wilson, emerged 

 March 27, 1930; and one female, reared at Winters, Calif., by the 

 same entomologist from the same host, emerged April 10, 1931. 

 Thus there are three different rearing records from Gryllus^ and 

 these are the only ones yet known. 



