June. I9II.] Schaeffer: New Coleoptera. 125 



longitudinal, polished space of the prosternum is a variable character 

 and is present in some specimens, more or less obliterated in others by 

 being sparsely punctate and rugose, while in a few the two areas are 

 united, owing to stronger, coarser punctuation and rugosity of the 

 usually smooth median area. 



Dr. Horn described novatiis as having the prosternum of the male 

 in front of the coxae coarsely punctured and opaque but none of the 

 males which I have seen has this, though a few have some coarser 

 punctuation and rugosity of this part and are intermediate. 



In dcbilis and dolosus some males have a more or less smooth 

 median area and others have the prosternum in front coarsely punc- 

 tured with scarcely an indication of a smooth median area. 



In most of the specimens of heyeri examined, the prosternum in 

 front of coxae is coarsely punctate and rugose, though in a very few 

 there is a faint indication of a smoother median space, owing to this 

 part being less coarsely punctate and rugose, while in the specimens 

 of lugcns the two areas are generally very well defined. 



.From the foregoing it is very plain that the sculpture of the pro- 

 sternum in front of coxae is very variable and cannot be relied upon 

 in the separation of species and even varieties as only a moderate 

 series is necessary to show the variability of the sculpture of the pro- 

 sternum in most of the species. 



Family Cistelid^. 



Stenochidus robustus, new species. 



Elongate, black. Head densely and coarsely punctate, eyes as in gracilis 

 and cyanescens ; antennae reaching to the middle of elytra, second joint small, 

 third joint elongate, slightly longer than fourth, the latter slightly wider at 

 apex than third fifth and following gradually decreasing in length, but each 

 wider than any of the preceding joints. Thorax slightly broader than long; 

 sides feebly arcuate and deflexed near apex ; apical and basal angles rounded ; 

 surface densely and coarsely punctate. Elytra slightly wider than the thorax 

 at base, humeral angles rounded, sides feebly arcuately widening towards apex, 

 striae relatively very deeply impressed and finely punctate ; intervals convex, 

 feebly rugose and finely irregularly punctate. Body beneath sparsely punc- 

 tate, except the underside of thorax which is more coarsely and densely punc- 

 tate, prosternum transversely rugose. Tibiae scarcely curved. Length 10.5 mm. 



California. (O. Dietz.) 



This species is very distinct from the others by its more robust 



