154 MEMOIRS ON THE COLEOPTERA 



knowing the male, Dr. Horn placed the type species in Discodertis. 

 The head is well developed, the mentum completely edentate as 

 usual and the frontal fovese more obvious than usual. The hind 

 tarsi are short as in Selenophorus, but the basal joint is not quite 

 so elongate, being scarcely longer than the next two joints com- 

 bined. A rather singular character, partially presaged in Seleno- 

 phorus fatuus, is the freedom of the punctures of the elytral series 

 from the striae; the punctures of the two inner series are but seldom 

 in close contact with the strije, though they are nearly normal and 

 substrial in the outermost series; in fatuus it is the middle series 

 that is notably erratic. My material seems to indicate two species 

 as follows: 



Form suboblong, rather elongate, very moderately convex, strongly 

 shining, dark testaceous throughout, except the elytra, which are 

 blackish-piceous and with scarcely visible greenish metallic lustre; 

 head fully three-fourths as wide as the prothorax, with moderate 

 though very prominent eyes, the foveae small and deep, punctiform 

 and lying within rather deep impressions; antennae pale testaceous, 

 slender and rather long; prothorax one-half wider than long, the 

 sides strongly rounded anteriorly, becoming oblique and nearly 

 straight thence to the base and finely though strongly, evenly 

 re flexed throughout; base transverse, slightly arcuate laterally, 

 with the angles very obtuse but evident though distinctly blunt, 

 not three-fourths as wide as the apex, which is broadly and very 

 feebly sinuate; surface with feeble transverse rugulae, fine but distinct 

 subentire stria and rather evident traces of irregular anterior and 

 posterior transverse impressions, the fovese moderate in size, deep 

 toward base and with a few r feeble sparse punctures; elytra one-half 

 longer than wide, a third wider than the prothorax, nearly parallel, 

 with feebly arcuate sides, widely basally exposed and non-denticulate 

 humeri and obtusely ogival apex, the sinus obsolete; striae fine [but 

 rather deep, the scutellar nearly obsolete, the intervals flat except 

 at apex, the serial punctures small and feeble, the margins and apex 

 distinctly and suffusedly punctulate; abdomen with very fine sparse 

 punctures; anterior and middle tarsi (cf ) rather strongly dilated, 

 the two series of squamae beneath conspicuous. Length (cf) 8.0 

 mm.; width 2.8 mm. Arizona (Tucson). [Discoderus cordicollis 

 Horn] cordicollis Horn 



Form somewhat similar but smaller and rather narrower, more parallel, 

 similarly feebly convex, very shining and piceous-black throughout 

 above, without metallic lustre, the rather finely but strongly and 

 evenly re flexed sides of the prothorax diaphanously paler; under 

 surface and legs testaceous, the antennae and trophi still paler; 

 head not so large, similarly with very prominent moderate eyes and 

 rather constricted neck, the foveae rather large, irregular and very 

 deep; antennae nearly similar; prothorax slightly more than one-half 



