FRANK E. BLAISDELL, SR. 327 



Bay, Alarin County, California. Specimens can be obtained 

 throughout the year, although they are most abundant from 

 March to July. The color varies from immaturity to nigro- 

 piceous. 



Size small to medium. Form oblong-oval to somewhat elongate-oval. 

 Labrum with two to five punctures in apical third, otherwise impunctate. 



Epistoma arising abruptly from the frontal suture, its vertical base more or 

 less transversely rugoso-punctate; surface of the median third very sparsely 

 punctate, usually glabrous at middle anteriorly; lobes slightly prominent, 

 feebly arcuate, sometimes subangulate; surface more or less impressed, rather 

 densely and coarsely punctate, a few punctures coalescing; side margins 

 oblique, feebly and broadly sinuate, oblique suture feeble; apical sinus broad 

 and rather less than moderately deep. 



Front not deeply impressed behind the suture, impression not distinctly 

 defined from the general surface, not very densely punctate, most of the punc- 

 tures furnished with a yellow hair. 



Mentum comparatively small, .sides straight and diverging as usual; apex 

 feebly sinuate, angles narrowly rounded; surface not strongly punctato- 

 scabrous, sometimes subcarinate in the median line. 



Pronolum not strongly convex transversely; sides broadly rounded, or less 

 so and more convergent; scarcely or narrowly explanate; disk rather finely, 

 sparsely and more or less evenly punctate. 



Prosternum not strongly asperato-punctate. Process glabrous and nearly 

 impunctate on the median line and on central area of the dilated apex; peri- 

 pheral punctures with long hairs; not distinctly margined between the coxae. 



Male: Rather broad to elongate oblong-oval; pronotum broader, or similar to 

 that of the female. 



Female: Form variable as in the male; pronotum usually narrower; elytra 

 slightly more inflated than in the male. 



Measurements. — Length, 5-7 mm.; width, 2.8-4 mm. 



A series taken from a single sand dune some distance from the 

 shore of Tomales Bay, determines the general characteristics of 

 this variety of ciliatus, as will be seen from the description the 

 form is variable in the sexes with all intermediate gradations. 

 About San Francisco (type region) the habitat is inland and 

 often away from the dunes. The dryer environment may explain 

 the smaller size. As compared with ciliatus it is usually much 

 smaller in size and narrower, although some of the specimens 

 are relatively as broad. In ' debilis the front is less strongly 

 punctured behind the suture and the sculpturing generally is 

 less developed. The elytra are frequently scarcely asperate, as 

 in pacificus. The color is more brownish and in many specimens 

 the suture is narrowly rufous and the surface luster dull and 

 more or less subopaque. Some of the specimens are scarcely 

 larger than Coelomorpha maritima Casey. 



TRANS. AM. ENT. SOC, XLV. 



