124 AMERICAN HYMENOPTERA. 



short and broad, with a triangular whitish mark, sparsely punctured. Labr\ini 

 large and black in color. Mandibles very heavy and strongly elbowed. Face 

 sparsely punctured, cheeks and occiput almost impunctate. Mesothorax very 

 sparsely punctured, smooth and purplish on the disk, and with the usual im- 

 pressed lines. Scutellum and postscutellum finely and rather closely punctiired. 

 Anterior half of upper surface of metatborax rugose, remaining part extremely 

 minutely punctured, strongly contrasting with the coarser punctures of the pos- 

 terior face. Abdomen large and broad, finely punctured, posterior segments ru- 

 gose. Venter clothed with fine grayish-white pubescence. Legs greenish-blue, 

 clothed with light pubescence, knees having a white spot, tips of tarsi ferrugin- 

 ous. Tubercles concolorous with thorax. Wings smoky hyaline. 



Described from one 9 specimen, collected by Dr. A. Davidson in 

 Tehachapi Mountains, California, altitude 4000 ft. 



This species is rendered very distinct by its great size, and its large 

 and peculiarly punctured head. 



