274 THE CANADIAN ENTOMOLOGIST. 



4. Antennae shorter and thicker, a little shorter than the head and pro- 



thorax ; pronotal sulcus sometimes interrupted behind the middle. 



California (Fisk's Mill, Sonoma Co.) interrtiptus, Csy. 



Antennae more slender, fully as long as the head and prothorax or a 

 little longer ; body less stout 5 



5. Ninth and tenth antennal joints but slightly transverse, less than one- 



half wider than long; lateral teeth of the prothorax very feeble, in the 

 form of feeble rounded swellings of the edge. Male with the fourth 

 dorsal feebly, transversely impressed at base, the polished impression 

 with a fine feebly-chagrined line along the bottom in median third. 

 California (Sonoma Co.) convexus^ Csy. 



Ninth and tenth antennal joints much more transverse, one-half to 

 two-thirds wider than long ; lateral teeth of the prothorax prominent 

 and very acute ; body a little smaller and narrower, though even 

 more convex, polished, dark testaceous, the pubescence rather 

 sparse, moderately distinct j integuments very finely, sparsely punc- 

 tate, the elytra more coarsely and rugulosely so, though not densely; 

 impression at the base of the first dorsal deep and large, one-half the 

 discal width. Male with the fourth dorsal wholly impunctate, more 

 broadly, feebly and indefinitely impressed transversely in nearly basal 

 half, the sparsely and feebly chagrined line broader and more 

 indefinite. Length, 1.6 mm.; width, 0.6 mm. California (Marin, 

 Alameda and Sta. Cruz Co's.) , testaceiis, n. sp. 



6. Male with a large, broadly concave and more indefinitely bounded trans- 



verse impression in about basal half of the fourth dorsal 7 



Male with a short, deeper and more abruptly defined transverse 

 impression at the base of the fourth dorsal 8 



7. Form stout, convex, dark castaneo-testaceous, polished, the pubescence 



moderately long, reclined, distinct though not dense ; head thick, sub- 

 triangular, the eyes well developed, the ambient sulcus deep as usual, 

 the antennae notably stout apically, the penultimate joints distinctly 

 transverse ; prothorax not very greatly though evidently wider than 

 the head, not quite as long as wide, angularly rounded and prominent 

 at the sides before the middle, the lateral teeth small but evident ; 

 discal fovese and sulci as usual ; elytra convex, about as long as the 

 head and prothorax, three-fourths or more wider than the latter, 

 the sides rounded, the elongate hjiimeral callus very pronounced ; 



