394 CALIFORNIA ACADEMY OF SCIENCES. 



In the male the last ventral segment is deeply and 

 acutely triangularly emarginate and of yellow color. In 

 the female the segment is sharper than at apex and very 

 convex, the edge turned upward and entirely piceous. 



The specimens examined show very little variation. 



Numerous specimens from Washington and Vancouver. 



Xanthochroa californica Horn, Trans. Am. Ent. Soc, 

 1874, P- 39- 



Form slender, elongate, head, thorax and legs (in great 

 part) reddish yellow, elytra decidedly blue, beneath 

 piceous. Antennae piceous, the first two joints paler 

 beneath. Head sparsely punctate. Thorax as wide as 

 long, sides arcuate in front, sinuate posteriorly, slightly 

 expanded at base, surface shining, very sparsely punc- 

 tate. Elytra densely punctate, subopaque, decidedly 

 blue in color, sparsely pubescent, disc feebly subcostu- 

 late. Body beneath piceous with faint bluish tinge. 

 Legs in great part pale, tibiae and tarsi piceous. Length 

 .24— .38 inch.; 6—9.5 mm - 



The male characters are very like those of lateralis. 

 In the female the fifth ventral is elongate-oval, subacute 

 at apex and entire. 



Occurs in El Dorado County, California. 



Xanthochroa marina n. sp. 



Slender, piceous, elytra blue, thorax reddish yellow. 

 Antennae wholly black. Head black, clypeus yellow, 

 front sparsely punctate, neck more densely. Thorax as 

 wide as long, sides strongly arcuate in front, sinuously 

 narrowed posteriorly, disc convex, shining, with very few 

 punctures. Elytra densely punctate, the costae very 

 feeble, the pubescence short, grayish, and sparse. Body 

 beneath more shining than above, very sparsely punc- 

 tate. Legs totally black. Length .32 inch.; 8 mm. 



