334 MEMOIRS ON THE COLEOPTERA 



daire, should be excluded and is made the type of the genus Tara- 

 nomis as stated above. 



Plionoma n. gen. 



Besides suturalis Lee. (Sphenothecus) and 5. rubens Csy., the 

 latter being a distinct species and not a variety of suturalis, we 

 have another definable as follows: 



Plionoma degener n. sp. Smaller and narrower than rubens, shining, 

 piceous-black, the prothorax bright red; under surface deep black, the 

 prosternum transversely rufescent; femora red, the tibiae and tarsi 

 throughout black or nearly so; pubescence pale, short and sparse above, 

 dense beneath except medially, sparse on the prosternum; head small; 

 antennae (9) black, about as long as the body, the third joint fully a 

 fourth longer than fourth to seventh, which are subequal, seven to ten 

 gradually decreasing, the last much shorter than the tenth; prothorax 

 nearly as in rubens in form and sculpture but, like the head, much less 

 pubescent; scutellum much narrower, twice as long as wide; elytra nearly 

 similar, coarsely, sparsely punctate, the punctures similarly smaller and 

 closer in a broad sublateral line but scarcely intermixed with smaller 

 punctures, the pale sutural line similar; under surface nearly similar but 

 much less pubescent. Length (9) 10.5 mm.; width 3.0 mm. Arizona 

 (southeastern), Dunn. 



Allied to rubens but differing in its smaller size, sparser pubescence, 

 especially on the head and prothorax above and beneath, in its 

 dark coloration, narrow scutellum and especially in having the hind 

 tibiae almost unmodified; in rubens they are slightly incurvate and 

 much more notably thickened apically than in degener. The hind 

 femora are more evidently bispinulose at tip than in either of the 

 other species. 



Taranomis n. gen. 



The type, named above, is the only species of this genus known 

 to me. The conoidal bivittate prothorax is nearly as in Sphceno- 

 thecus, but the elytra are wholly different in structure. It seems 

 to be a local development and confined to Texas and adjoining 

 regions. Besides bivittata Dup., this genus may possibly include 

 the Ischnocnemis pallida of Schaeffer, from Lower California, but 

 the probabilities are that it is not strictly congeneric. 



Perarthrus Lee., is represented also by a single species, likewise a 

 local development and confined to the seacoast regions of southern 

 California. My single representative is much smaller than the 

 single original male type, being only 8.2 mm. in length; it is a fe- 



