20 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



anterior portion of metapleural region nearly smooth and without 

 hairs; posterior portion not very definitely marked off above from 

 the propodeum. 



Propodeum: Black with three yellow spots — one on each side at 

 anterior end, each of these extending downward and posteriorly to 

 a point, and one at the end of the propodeum extending forwards on 

 both sides of and extending over on the dorsum; propodeum punc- 

 tate, finely striate, and hairy. 



Abdomen: Petiole smooth, nonpunctate, minutely sericeous in 

 places, yellow to ferruginous ; abdomen long, ovate, pointed at apex ; 

 first segment yellow, with a fusco-ferruginous stain above petiole; 

 rest of segments black anteriorly, yellow posteriorly, smooth, and no 

 more than slightly sericeous except the last dorsal and ventral seg- 

 ments, which are sparsely hairy and punctate. 



Legs : Anterior four : Coxae black, often ferruginous at tip ; tro- 

 chanters ferruginous; femora ferruginous at base to yellow at tip; 

 tibiae yellow ; tarsi yellow, the outer segments becoming ferruginous. 

 Hind legs : Coxae black, ferruginous at tip ; trochanters ferruginous ; 

 femora ferruginous at base, the rest fuscous to black; tibiae yellow, 

 black distally; tarsi yellow, the outer segments probably becoming 

 ferruginous or fuscous (only two specimens were available, and both 

 of these lacked the last two tarsal segments). Coxae and trochanters 

 very sparsely hairy; entire surface of legs more or less sericeous; 

 tarsal claws ferruginous, with a minute tooth near the middle on the 

 inner surface ; spines on legs varying from yellow to fuscous. 



Wings: Transparent *with a ferruginous tinge; outer margins 

 slightly infuscated; wings sometimes with an extremely slight violet 

 reflection. 



Male. — Only one male was available for study, and that one was 

 extremely small, and may have been abnormal in other respects. 

 Differed from female as follows: Petiole entirely black; teeth of 

 clypeus more pointed ; abdomen shorter and less acute. 



Genitalia : Practically the same as those of caementariuTn (figs. 

 16, 17, and 18). 



Length.^ female, 20 mm. to 24 mm.; male, 14 mm. (As already 

 mentioned, only one male was available for study, and this one was 

 probably unusually small.) 



Habitat. — California, Lower California. 



Type. — Probably in the Saussure collection at Geneva. 



UNIDENTIFIED AND OTHER SPECIES 



The following species have been described as occurring within the 

 geographical limits of this paper, but have been unrecognized or 

 should be placed in other genera. 



