290 H. C. FALL. 



1!). D. pusilla Lee. 



In well preserved specimens the pubescence is seen to be sparser 

 or nearly wanting in several longitudinal lines on each elytron, giv- 

 ing a distinctly vittate appearance which is peculiar to the species. 

 The thoracic sulcus is rather less pronouuced than in the other 

 members of the group, and the posterior tibial spurs are of the type 

 prevailing in the species with non sulcate thorax. For these rea- 

 sons I have thought best to place it at the head of the grou}) rather 

 than at the end, where it was left by Horn. It is common in the 

 Southern Californian coast region from San Diego to Santa Barbara, 

 and I have seen one example from as far north as Monterey. Wick- 

 ham reports taking a single specimen at Coolidge, New Mexico. I 

 suspect this may be an error in determination, and that his speci- 

 men is one of the varieties of sulcata. I have taken specimens in 

 numbers in early June flying at dusk about the flowers o^ Aclenos 

 toma faseiculata in the foot hills near Pomona, and have also taken 

 it at same time of day flying about rose bushes in the city itself. 



20. D. decolorata sp. nov. 



Body beneatli, head, thorax, suture and lateral stripe on the elytra, black ; 

 otherwise testaceous. Head densely subrugosely punctate, vertex with rather 

 small fusiform smooth space which does not reach the clypeal suture: clypeal 

 suture impressed, strongly angulate; clypeus moderately reflexed, truncate, or 

 very feebly arcuate in front, lateral angles broadly rounded, sides a little conver- 

 gent anteriorly. Thorax with rather shallow median groove, surface moderately 

 closely punctate laterally, more finely and sparsely toward the middle; basal and 

 apical marginal lines distinct; sides obtusely angulate just before the middle, 

 feebly sinuate posteriorly, hind angles obtuse, not at all prominent. Elytra 

 rather finely and not densely punctate. Spurs of hind tibise slender, nearly 

 equal. In the male the outer spur is, however, more obtuse at tip than the inner, 

 while in the female there is no apparent difi'erence in this respect, both spurs 

 being acute. Length 9-11 mm. 



Hab. — California (Santa Clara and Monterey Counties), 2 males, 

 3 females. 



The color of this species, as above described, is that of the two 

 males, and is almost precisely that of lateralis, except that in the 

 present species there is no noticeable metallic lustre. The three 

 females are testaceous throughout. Decolorata is nearest the Marin 

 County specimens assumed to be valida, but is clearly distinct by 

 the color, finer and sparser punctuation of thorax and elytra, the 

 denser punctuation of the clypeus, more strongly angulate clypeal 

 suture and shallower pronotal groove. The hind claws are slightly 

 l)ut distinctly cleft. 



