474 CASEY 



Surface depressed and nearly flat as in plicatus, similarly densely 

 covered with a thick brown indument of close-set scale-like sub- 

 erect hairs, mingled with hard earthy material, the tubercles with 

 longer, stout, reclined and curved fulvous subsquamoid bristles ; 

 head remotely bi-impressed, with small sparse black tubercles and 

 fulvous bristles ; prothorax not quite as long as wide, rounded at 

 the sides, the latter converging toward base and becoming briefly 

 sinuate at the basal margin, the surface with two sinuous ridges 

 and scattered tubercles nearly as in plicatus; elytra with the 

 ridges and posterior tuberosities similarly placed but much feebler, 

 the small black tubercles penetrating the crust, finer and more 

 remotely scattered. Length 15.5— 16.5 mm. ; width 5.7-5.9 mm. 

 California (Los Angeles Co.) corrosus n. sp. 



Surface much more convex than in any other species, the form 

 stout, parallel, with thick and dense, multi-fissured dark in- 

 dument ; head impressed, nearly smooth, with small scattered 

 tubercles ; prothorax not quite as long as wide, the sides parallel 

 and arcuate, becoming moderately convergent and feebly arcuate 

 in basal three-fifths, feebly sinuate at the obtuse basal angles, the 

 base broadly arcuate; surface with the sinuous ridges narrow, 

 feeble and wholly interrupted at the middle of their length, the 

 surface at the sides more coarsely and roughly sculptured than in 

 plicatus^ the scattered tubercles nearly similar; elytra a little 

 broader and relatively shorter than in plicatus but almost similarly 

 ridged and tuberose, the large irregular indentations much deeper, 

 the tubercles fine and remotely scattered. Length 16.0 mm. ; 

 width 6.5 mm. California convexulus n. sp. 



Corrosus is represented by two similar females and convex- 

 ulus by a single female, from an unrecorded locality of the 

 State; it is the broadest and least flattened form known thus 

 far. I believe that the genus Noserus will prove to be con- 

 fined to the true Pacific coast fauna, with its very close rela- 

 tive PhloRodes^ and that the species described from Texas by 

 Dr. Horn, under the name emarginatus, will prove to be gener- 

 ically different, possibly belonging to a Mexican type related 

 more closely to Nosodervia. 



Nosoderma Sol. 

 I have here restricted this genus to those species having the 

 elytra almost evenly rounded behind, with large isolated tuber- 

 osities scattered over posterior half, none of which is strictly 

 marginal and with longitudinal, more or less incomplete or 

 interrupted ridges thence to the base, the mentum very small, 

 transverse, obliquely narrowed and narrowly truncate ante- 



