332 CALIFORNIA ACADEMY OF SCIENCES. 



very slightly wider than long; joints of club equal in width, together dis- 

 tinctly shorter than the preceding six; tenth wider than long, evenly rounded; 

 all three coarsely and rugulosely punctate toward tip and inwardly. Prothorax 

 widest at two-thirds its length from the apex where it is two and one-half 

 times as wide as the head and one-half wider than long; sides at this point 

 strongly arcuate, thence moderately convergent and nearly straight to the 

 apex, more strongly convergent to the basal angles which are slightly prom- 

 inent, not at all rounded, and before which the sides are rather deeply sinu- 

 ate; disk coarsely and rather densely punctate very near the sides, elsewhere 

 more finely and very sparsely so, rather strongly convex. Elytra widest at 

 two-thirds their length from the base where they are nearly one-fourth wider 

 than the pronotum and one-third wider than at base; sides rather strongly 

 arcuate posteriorly, strongly convergent toward the apex which conjointly is 

 rather evenly and strongly rounded; disk strongly convex, distinctly striate 

 except very near the sides where the punctures become confused; striae finely 

 punctate with the interspaces much longer than the punctures; intervals 

 strongly convex, very feebly and indistinctly rugulose, each with a single or 

 partially double row of excessively minute punctures along the middle of 

 its crest. Under surface very coarsely punctate, densely so on the abdomen. 

 Length 9.5 mm. 



California (Eureka, Humboldt Co., 1). 



The single specimen which was captured in a dusty wagon 

 road, is a female. It is at once distinguishable from any of 

 the others described from North America by its very convex 

 form, partially oval outline, pale color, and very sparse 

 punctuation of the pronotal and elytral disks. 



Platycerus Agassii Lee. — One male of this species was 

 taken while flying amongst the undergrowth of a dense red- 

 wood forest in the Anderson Valley, Mendocino Co. 



The described species of Platycerus occurring within the 

 United States may be classified as follows : 



Sides of prothorax not sinuate at the basal angles quercUS 



Sides of prothorax more or less sinuate at the basal angles. 

 Last joint of the antennal club strongly transverse. 



Elytral striae very fine, not at all impressed; punctures 



fine oregonensis 



Elytral striae coarse, distinctly impressed; punctures very 



coarse depressus 



Last joint of club nearly as long as wide. 



Elytral intervals unequal in width, coarsely, closely and 



unevenly punctate; elytra moderately convex Agassii 



Elytral intervals equal in width, very minutely, sparsely 



and sub-serially punctate; elytra strongly convex californicus 



