74 AMERICAN COLEOPTERA. 



oblong-ovate, about one-half wider than the thorax, elongate, moderately deeply 

 striate, more finely at sides and towards the apex ; striae distinctly punctate to 

 behind tlie middle the first and second entire, as is also rarely the fifth, which is 

 usually represented by a groove at tip, the others abbreviated behind ; third stria 

 with the ilrst dorsal puncture about one-third from base, the second about one- 

 third from apex : intervals slightly convex. Beneath l)lack, shining. Legs tes- 

 taceous or rufo-testaceous. Length .26-. 30 inch ; 6.5-7.5 mm. 



Closely allied to transversals, but more slender and elongate with 

 the hind angles of the thorax sub-acute and the outer strife of the 

 elytra abbreviated behind. 



It occurs in Colorado, Utah, New Mexico and California. 



Group ix. ustulatum. 



Maxillse with the outer lobe bi-articulate. Frontal grooves single, 

 straight, parallel ; eyes moderately large, prominent. Prothorax 

 subcordate or cordate, usually narrower at base than apex, with the 

 basal impressions bistriate, the outer stria often rather small. Elytra 

 with the humeri rounded ; dorsal punctures, two in number, on the 

 third stria ; outer strise usually more or less abbreviated behind, the 

 eighth not distinct from the margin. 



This group contains a moderately large number of species, many 

 of which are quite difficult to define. It has been found necessary 

 to remove four species which have usually been placed here in our 

 lists, the dorsal punctures being situated on the third interval. They 

 must accordingly enter the group with ephippiger, morulum, etc. 

 The species referred to are tigrinum, scintillans, aratum and dys- 

 chirinum. 



The following table, it is hoped, will aid in the separation of our 



species : 



Thorax narrower at base than apex 2. 



Thorax as wide at base as apex. 



Dark brown varying to black, scarcely seneous, elytra with an ill-defined basal 

 spot and a submarginal one about one-fourth from apex pale, finely 

 striato-punctate ; thorax with the sides at most obsoletely sinuate behind, 

 hind angles sub-obtuse; legs piceous or nearly black, tibise and tarsi 



sometimes rufo-piceous. Length .18-.23 inch nevadeiise Ulke. 



Black, slightly aeneous, elytra with a submarginal spot near the apex or the 

 entire apex pale, moderately deeply striato-punctate; thorax with the 

 sides distinctly sinuate behind, hind angles rectangular ; legs usually 

 rufous, with the femora darker. Length .17-.21 inch. 



cousanguiiieuin u. sp. 



2. Elytra either immaculate or with a pale submarginal spot near the apex. ... 1. 



Elytra each with a well-defined basal and another subapical spot pale ; legs 



rufo-testaceous 3. 



