56 Proceedings of the Biological Society of Washington. 



evenly distributed. Color uniform cobalt blue. Underparts metallic 

 blue black, punctuation very fine and sparse, sides of metasternum finely 

 rugulose, pubescence sparse. Legs blue black, anterior and middle tibiae 

 and all tarsi piceous, hairy. Length: 3 mm. 



Described from two specimens collected at Pasadena, Cal., by Dr. A. 

 Fenyes. A beautiful species, very distinct from cijanitincta Fall, which 

 resembles it superficially, in the form of the thorax and by the sculpture 

 of the thorax and elytra. The type remains in the Wolcott collection, 

 while the paratype is placed in the author's collection. 



Hydnocera occiden talis, n. sp. 



Form of H. humeralis Say from which it differs in the much more dense 

 punctuation of the elytra and the more pronounced rugosity of the thorax 

 and head. Head broad, finely and densely punctured, the occiput some- 

 what rugulose, antennae short, rather stout, dark brown, trophi dark. 

 Thorax not as wide as head across eyes, or across humeri, broader than 

 long (26-31), disk smooth, lateral portions rugose, individual punctures not 

 distinct. Lateral foveae large, single, lateral dilation prominent. Basal 

 and apical transverse impressions deep and distinct. Scutellum oval 

 behind, sparsely pubescent. Elytra entirely covering abdomen, sides 

 parallel, apices almost truncate, internal angle rounded, very feebly serrate, 

 punctures rather coarse, dense, confused at apices, surface covered with a 

 mixture of silvery white and black hairs, silvery hairs more dense near 

 middle of length, not so placed as to form a pattern. Color greenish to 

 bluish black. Under parts black, mesosternum finely punctured, meta- 

 sternum smooth. Terminal abdominal segments modified as in //. palli- 

 pennis Say. Legs black, anterior tarsus slightly more than half as long 

 as anterior tibia. Length: 4-4.5 mm. 



Described from six specimens, a male (type), a female (allotype), one 

 male and three females (paratypes) from Palo Alto, Cal., collected in Jan- 

 uary. Of these, the type and a female paratype remain in the collection 

 of the author, the allotype and male paratype are in the collection of Mr. 

 Wolcott while the remaining paratypes are returned to Mr. C. A. Frost, to 

 whom we are indebted for the privilege of describing this material. This 

 is a less elongate species that H. cyanitincta Fall and is not of such a distinct 

 blue color, though it belongs near to this species. 



Hydnocera picipennis, n. sp. 



Elongate ; greenish black, elytra and legs piceous, antennae, mouth parts, 

 anterior tibiae, tarsi (posterior?) paler. Head greenish black, front with 

 fine and coarse punctures intermingled, vertex rugose, pubescence sparse, 

 depressed. Eyes large, convex. Thorax broader than long (31-38), 

 lateral dilations strong, sides toward base parallel, foveae distinct, apical 

 impre-ssion fine and distinct, basal a rounded groove, surface densely rugose 

 at sides, smooth on disk with a few punctures, pubescence sparse, suberect. 

 Scutellum black, sparsely hairy. Elytra nearly as long as abdomen, lateral 

 margins slightly sinuate at apical third, tips oblique, internal angle rounded, 

 irregular nearly smooth, suture nearly closed. Surface coarsely, densely 

 and somewhat confluently punctured, pubescence not dense, evenly dis- 



