ABT. 3 WASPS OF SUBFAMILY BBACHYCISTHNAE MALLOCH 25 



BBACHYCISTIS (BRACHYCISTIS) TRIANGULARIS Cresson 



I identify as this species specimens from Hot Springs and Higley, 

 Ariz., and Lordsburg, N. Mex. 



Originally described from Arizona. 



BRACHYCISTIS (BRACHYCISTIS) INDISCRETA Fox 



I have before me a specimen from Wilcox, Ariz., which agrees 

 with specimens, evidently from the type material, in the United 

 States National Museum. 



Bradley includes this species in his key but omits it in the treatment 

 of the species. 



Bkachycistis (Brachycistina), new subgenus 



This subgenus is distinguished from the other two by the presence 

 of only one preapical mandibular tooth which is sometimes poorly 

 developed. 



Genotype. — Brachycistis {Brachycistina) acuta, new species. 



There are two species referable here which may be distinguished as 

 indicated below. 



KEY TO SPECIES 



Preapical tooth of mandibles poorly developed, an angle, apical tooth long and 

 sharp (fig. 26) ; posterior ocelli separated from e.ye and from anterior ocellus by 

 about twice as great a distance as their transverse diameter, .acuta, new species. 



Preapical tooth of mandibles well developed, apical tooth short and stout (fig. 25) ; 

 posterior ocelli separated from eye and from anterior ocellus by about as great 

 a distance as their own diameter elegantula (Cockerel! and Casad). 



BRACHYCISTIS (BRACHYCISTINA) ACUTA, new species 



Male. — Pale brownish-orange, head fuscous above, tips of mandibles 

 blackish; stigma pale-brown. Head subquadrate above; ocelli rather 

 small; clypeus as in Figure 27, descending farther than in any other 

 species known to me, the apex transverse, not bevelled and without sub- 

 median teeth, the central part with a rounded elevation which slopes 

 evenly off on sides and below; gular orifice not over one-third wider 

 than space between it and eye at anterior extremity, the carina low, 

 not bevelled at anterior extremity; vertex with very few punctures. 

 Propodeum short and robust, without distinct sculpture. Basal 

 abdominal segment about as long as its apical width; hypopygium as 

 in Figures 54 and 55. Hind tibia with two or three short bristles show- 

 ing amongst the hairs; hind coxae not carinate. Fore wing in type 

 with but two submarginal cells, the cross vein from stigma inter- 

 stitial with vein closing second submarginal, the latter cell a little over 

 half as long as first. 



Length, 6 mm. 



Holotype. — Arlington, Ariz. June 17, 1919 (A. Wetmore). 



Type.—C&t. No. 27930, U.S.N.M. 



Genitalia and apical segments of abdomen in vial witli alcohol. 



