14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



Originally described from La Jolla, Calif., and not seen by Bradley, 

 who states that Professor Cockerell informed him the type is in the 

 National Museum. I have been unable to find the type, but have 

 before me a large series of males taken at San Diego, Calif. 



BRACHYCISTIS (BRACHYCISTIS) PARVA, new species 



Male. — Differe from gaudii Cockerell as stated in diagnosis. 

 B. petiolata Blake is larger, 8 mm. in length, and has the propodeum 

 with the sides of the dorsal surface and the postero-lateral angles 

 rugose; the general color is rather uniformly dark castaneous. The 

 new species has the propodeum microscopically shagreened above 

 and along upper margins of sides. 



Length, 5 mm. 



Holotype. — California (C. F, Baker). 



Type.— Cat. No. 27913, U.S.N.M. 



I have also before me a specimen which is 7 mm. in length, agrees 

 in color with parva, except that the head is black above and the 

 body darker, and has the posterior ocelli at a little less than their 

 transverse diameter from eyes. The propodeum is more coarsely 

 shagreened than in parva, but not rugose as Bradley says is the 

 case in petiolata. It is possible that this specimen represents another 

 species, but more material is desirable before describing it. 



Locality. — Arlington, Ariz., June 16, 1919 (A. Wetmore). 



AMPLA group 



I assign to this group besides ampla Blake, protracta Bradley. 

 I have not seen the latter, but Bradley says they are very closely 

 related. He makes no mention of the peculiar posteriorly narrowed 

 head. In both species the gular carina is elevated at anterior margin 

 and deflected outwardly at that point. Bradley's characters for 

 distinguishing them are as follows: 



Head 0.4 wider than minimum distance between the tegulae; petiole, viewed 

 from the side, evenly but slightly enlarged posteriorly, four times as long as 

 its dorso-ventral thickness; mandible without a carina on the upper surface 

 at base; R, not meeting r-m at an angle, the cell Rj therefore triangular; 

 color dark castaneous. Length 20 mm protracta Bradley. 



Head one-tenth wider than minimum distance between the tegulae; petiole 

 suddenlj' widened toward its apex, three and one-half times as long (measured 

 along the side) as its greatest dorso-ventral thickness; each mandible with a 

 strong carina along its upper surface, arched into a tooth near its base; R, 

 meeting r-m at an angle, the cell Rs therefore four sided; color brownish- 

 3'ellow. Length, 14 mm ampla (Blake). 



BRACHYCISTIS (BRACHYCISTIS) AMPLA (Blake) 



I have before me a number of examples of this species, some of 

 which are about 20 mm. in length while others are about 14 mm. 

 The petiole of the abdomen is in some of these specimens quite 

 four times as long as its greatest dorso-ventral thickness, but the 



