AMERICAN HYMENOPTERA. 133 



July, 190G, p. 187), differing markedly in the shape of the 

 eyes. In my opinion montivaga should not be placed in the 

 group Timulla, as the type of it (Timulla) has oval eyes, while 

 montivaga has round eyes. 



It has been suggested (Fox, Tran. Am. Ant. Soc. xxv, p. 

 270) that hexagona Say is the male of dubitata Sm. Males 

 which are very close to hexagona have been taken in the same 

 locality and in the same season as the above female. Think- 

 ing that the above female belongs to these males, and the 

 males are Blake's briaxns, and the above female is distinct 

 from dubitata, I consider briaxus as a good species. They 

 differ from hexagona in having the hair of the abdomen black 

 and having only the apex of the scape with white hair. 



Smaller females with pubescence of the abdomen black, 

 and bearing much the same relation to dubitatiformis that 

 the variety omativentris does to dubitata have been found at 

 Boulder. They are known at once from omativentris by the 

 granular pygidium (in omativentris the pygidium, at least at 

 the base, is longitudinally striated). 



Epliuta boulderensis n. sp. 



Male. — Length S mm. Head round, not as wide as the thorax; 

 covered with large, rather close punctures, the sculpture not very 

 distinct because the close pubescence hides it. Mandibles with three 

 small apical teeth. Eyes round, prominent, facets small, but distinct. 

 Antennae reaching beyond the tegulas; third joint shorter than the 

 fourth, apical joint longer than the preceeding one, acute at the apex. 

 Pro thorax and dorsulum with rather large close punctures; meso- 

 pleurse similarly sculptured; metathorax with large, shallow, some- 

 times confluent punctures. Radial cell truncate; third cubital cell 

 not clearly defined; first and second tran. cu. almost meeting on the 

 radius. First abdominal segment small, nodose at the apex; its ven- 

 tral carina "with a tooth both anteriorly and posteriorly, the anterior 

 one the stronger. Second abdominal segment with deep slightly 

 elongate punctures. Spines at the apex of the abdomen rather long, 

 not strongly tapering. Head, antennae, pro- and mesothorax, and 

 legs black; metathorax and abdomen ferruginous or rufo-piceous. 

 Head and upper part of the pro- and mesothorax with matted and 

 erect gray pubescence; mandibles, lower part of the pleurae, legs and 

 abdomen with long black hair; at the tip of the abdomen is a bunch 

 of glistening, fulvous hair. Wings brownish-black; venation black. 



Habitat. — Boulder, Colorado, August 4, 190S (S. A. Roh- 

 wer). 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



