136 MEMOIRS ON THE COLEOPTERA. 



tennae of the usual form; prothorax smaller than usual, similarly transverse, 

 almost parallel and broadly arcuate at the sides, much wider than the head 

 and very obviously narrower than the elytra, the surface impressed very 

 minutely as in the preceding; elytra short and strongly transverse, the suture 

 equal in length to the prothorax; abdomen slightly narrower than the elytra, 

 formed as usual, very nearly parallel. Length 1.75 mm.; width 0.34 mm. 

 Arizona (Winslow) , YVickham. 



A somewhat aberrant species in its more slender form, relatively 

 smaller head and prothorax and short elytra. 



Arisota umbrina n. sp A little larger than the other species and rather 

 stout, less shining, the micro-reticulation of the head and pronotum very 

 strong, feebler on the elytra and abdomen, the asperate punctures strong 

 and close-set as usual ; color black, the elytra barely at all paler, the legs 

 piceous; head transversely orbicular, almost evenly rounded at the sides, 

 the eyes large, at much less than their own length from the base; antennae 

 piceous-black, of the usual type, the outer joints slightly wider than long; 

 prothorax rather large, moderately convex and transverse, the sides not 

 strongly arcuate and feebly converging from base to apex, very much wider 

 than the head and not distinctly narrower than the elytral base, the median 

 line very feebly impressed at base; elytra well developed though strongly 

 transverse, the suture about a fourth longer than the prothorax, the sutural 

 angles, as usual in the genus, well rounded; abdomen narrower than the 

 elytra, only very slightly narrower at the apex of the fifth tergite than at 

 base. Length 1.8 mm.; width 0.45 mm. California (San Diego, Pomona, 

 Barstow and Catalina Island), Nevada (Reno) and Arizona (Winslow). 



A rather abundant species in the southern Pacific regions and 

 possibly heretofore described under another name. It is allied by 

 its sculpture to the eastern tetrictila, but is larger, stouter and with a 

 larger and relatively wider prothorax. The example from Barstow 

 has the pronotum distinctly though obtusely impressed along the 

 median line throughout the length, and there may be some varietal 

 forms included in my collection. The type is from San Diego. 



Dolosota n. gen. 



The species of this group are small in size and testaceous in color 

 to a greater or less extent. The prothorax is broad and frequently 

 much wider than any part of the elytra, the middle coxae approxi- 

 mate, the mesosternal process only moderately long, with its acute 

 or aciculate tip well separated from the rather short but broadly 

 angulate metasternum, by a deeply sunken acute ridge. The hind 

 tarsi are very slender and filiform, with the first four joints equal, 

 or with the first sometimes a little longer than the second, the 

 cephalic carinae generally entire, the antennae only moderately short, 



