346 Coleopterological Notices, VII. 



widest behind the middle, smooth and impunctate, the foveolse nearly as in 

 IsBvigatus but smaller, feebler and less perfectly defined. Legs moderate in 

 length, the femora somewhat metallic greenish, the anterior tibiae and tarsi 

 violaceous; first four joints of the anterior male tarsi feebly dilated. Length 

 6.5-6.8 mm. ; width 2.8-3.0 mm. 



California (San Francisco). 



The three specimens, which I took in the suburbs of the city, 

 represent a species which is smaller than laevigatus, a,nd which dif- 

 fers besides in its smaller head, feebler pronotal impressions with 

 shorter median line, and still finer and very much denser punctu- 

 ation of the propleuroe. 



PROMECOGIVATHUS Chaud. 

 The body in this genus is very smooth, highly polished and 

 impunctate, even the elytral striae being wholly obliterated. 

 There are two supra-orbital setse, and usually two anterior and 

 one basal seta at each side of the pronotum. Of the two de- 

 scribed species, crassus has the elytra much shorter and 

 broader than laevissimus, and is a stouter insect in all its propor- 

 tions ; the following is almost as much more slender than Isevissi- 

 mus, as the latter is narrower than crassus. 



P. delbilis n. sp. — Slender, moderately convex, very highly polished and 

 sculptureless, dark jDiceous-brown in color throughout. Head nearly as in 

 laevissimus, except the mandibles which are shorter, the left much less pro- 

 longed inwardly and less aciculate at apex. Prothorax fully }^ longer than 

 wide and much narrower than in lasvissimus, widest near apical third, the sides 

 evenly rounded, gradually convergent posteriorly, sinuate near the base, the 

 sides thence straight and parallel to the basal angles, which are slightly obtuse 

 but not in the least blunt and feebly reflexed dorsally, the impression of the 

 surface being quite deep. Elytra evenly elliptical, ^ longer than wide, % 

 wider than the prothorax and less than twice as long ; sides broadly and evenly 

 arcuate. Length 9.0 mm.; width 2.8 mm. 



California (Sta. Cruz). 



There are no well marked structural characters to distinguish 

 this species from either of the other two, but on comparing the 

 type with a very large series of laevissimus, its distinctness seems 

 to be apparent at once. It is only because of the completeness 

 of this series and the absence of any approach to the present 

 form, even in its smallest components, that I have deemed it ad- 

 visable to found a species upon the unique individual taken by 

 myself about ten years ago. The type bears no special evidences 

 of immaturity other than its paler color. 



