46 Journal New York Entomological Society. [Voi.xviii. 



Californica. 



This is placed in the group with lobed prosternum. The prester- 

 num is really completely devoid of any trace of a lobe. The form of 

 the apical dilatation of the front tibia of the male is also incorrectly 

 described. The species described by Horn as californica is — in these 

 two respects at least — the monticola of the present paper. 



Caurina. 



Placed by Horn in the group with prosternum not lobed. There 

 is an evident lobe in all specimens examined by me, including ex- 

 amples from the type series kindly sent me for study by Dr. Skinner. 



Carinipennis. 



The anterior tibiae of the male are said to be deeply sinuate at the 

 base of the dilatation. The type shows no such sinuation. These 

 are fundamental characters, and if misapplied the situation cannot 

 be saved by any amount of fidelity as to other details. The species 

 trinervia to californica of Group IV are therefore retabulated below, 

 and with them are included four new species which fall within the 

 same limits. In interpreting the form of the prosternum the faintest 

 possible arcuation of the anterior margin is not to be considered a 

 lobe, but anything suggestive of a lobiform prominence, no matter 

 how short, is to be thus construed. A small amount of individual 

 variation in this particular has been observed, but with some experi- 

 ence, especially if several examples are at hand, there should be no 

 great difficulty in deciding to which group a given specimen belongs. 



Key to Species trinervia— californica of Horn's Group IV. 



A. Prosternum not lobed in front, the anterior margin at most very broadly 



and feebly arcuate at middle ; anterior tibiae of male not or but 



slightly sinuate above the apical dilatation. 



B, Tibial dilatation of male narrow and long, one third the length of 



the tibia ; eyes widely separated above ; body beneath bronzed, size 



larger (about 17 mm.) californica Lee. 



BB. Tibial dilatation evidently less, usually much less than one third the 



length of the tibia ; eyes less widely separated above, always by 



a distance which is distinctly less than half their vertical 



length; size smaller (rarely as much as 14 mm.). 



C. AntennjE with joints 4-1 1 in part testaceous; apical dilatation of 



front tibia of male dentiform verdigripennis Frost, 



CC. Antennae entirely dark, usually with metallic lustre throughout. 



