352 Coleopterological Notices, V. 



California (Humboldt Co.). 



The labial palpi are very long and slender, composed apparently 

 of two closely connected joints, forming an obtuse angle, the second 

 about one-half longer than the first and feebly acuminate toward 

 tip. This species agrees tolerably well in form and size with rubi- 

 ginosa, but the sides of the prothorax are more convergent and 

 sinuate toward base, and the basal angles are much more pro- 

 nounced ; the antennse, also, are longer, rather looser and more 

 incrassate. 



Silusa gracilis Sachse, is a more slender parallel and less convex 

 species, with the second joint of the labial palpi much shorter, not 

 longer than the first, and somewhat claviform. I have specimens 

 agreeing very well with the description from Pennsylvania and 

 Iowa. The following is a species more nearly resembling gracilis, 

 but much smaller still : — 



S. nanilla n. sp. — Rather narrow, tliick, subparallel, moderately shin- 

 ing, the head coarsely, very densely but inconspicuously punctate, the punc- 

 tures round, very shallow, variolate and somewhat umbilicate ; pronotum 

 reticulate, finely densely and granularly punctate ; elytra coarsely deeply 

 and densely so, the punctures normal but giving a somewhat rugose appear- 

 ance ; abdomen finely but strongly, granularly and rather densely punctured 

 toward base; pubescence fine, suberect, dense but not conspicuous ; abdomen 

 with long bristling pubescence toward apex, especially beneath ; color very 

 dark red-brown, the abdomen feebly rufescent toward base, pale at tip ; legs 

 pale flavate ; antennae dusky, the basal joints and also the eleventh paler. 

 Head transverse, fully three-fourths as wide as the prothorax ; eyes moderately 

 prominent, at their own length from the base ; antennae short, feebly incras- 

 sate, but slightly longer than the head and prothorax, bristling with long 

 sparse setae, basal joint much longer and thicker than the second, tlie latter 

 longer than the third, which is twice as long as wide, fourth subquadrate, 

 outer joints becoming strongly transverse, also more and more obconical and 

 with a corona of dense ashy pubescence, the tenth scarcely twice as wide as 

 long, eleventh large, conoidal, as long as the two preceding. Protliorax three- 

 fourths wider than long ; sides parallel, almost evenly, distinctly arcuate, 

 becoming straight and convergent in basal half; base and apex subequal, 

 the former more arcuate ; basal angles very obtuse but distinct ; basal beaded 

 edge conspicuous and rather abruptly defined ; disk very obsoletely, broadly 

 flattened in the middle before the base. Ehjtra subquadrate, one-fourth wider 

 and fully one-half longer than the prothorax ; sides nearly straight, the 

 humeri slightly visible. Abdomen narrower than the elytra but wider than 

 the prothorax; sides parallel and nearly straight ; first three segments im- 

 pressed at base; fifth longer than the fourth. Legs moderate; posterior tarsi 

 short, the first two joints oblong, equal. Length 1.7 mm. ; width 0.5 mm. 



