AMERICAN COLEOPTERA. 297 



The name above used has been taken from the Munich Catalogue. 

 The description is unknown to me. 



O. rubra. Weber. — Broadly cuneiform, depressed, elytra broader at apex, 

 color above rose red or reddish yellow, the elytra slightly clouded with darker 

 spaces. Vertex punctured. Thorax much broader behind, sides nearly straight, 

 coarsely and deeply punctured, slightly depressed posteriorly. Elytra broader 

 at apex, which is obtuse, the margin explanate and serrate, disc with ten rows of 

 punctures and three entire rather strong costae; between the second and third 

 costae a shorter one which starts from the humeral umbone and joins the second, 

 and a shorter which starts from the third near the apex and extends forward. 

 Length .24-.26 inch ; 6-fi.5 millim. 



The under side of the body varies in color from piceous to pale red. 



This species is widely diffused, specimens have been seen even from 

 California. 



O. calil'ornica n. sp. — Beneath piceous, above reddish yellow, nearly as in 

 rubra. Vertex with longitudinal impression. Thorax a little wider posteriorly, 

 disc coarsely and deeply punctured, slightly flattened near the base, sides nearly 

 straight or slightly sinuate. Elytra gradually wider posteriorly, the apical mar- 

 gin feebly explanate and finely serrate, disc with rows of punctures and costae as 

 in rubra. Length .18 inch: 4.5 millim. 



This species might be mistaken for the smaller forms of rubra. It 

 differs, however, in having the thorax much less dilated posteriorly, and 

 the elytra have not the rather abrupt expansion of the apex. In rubra 

 the thorax at base is nearly twice as wide as the apex, in the present 

 species not more than one- fourth wider. The elytral costae while they 

 preserve the type of rubra are much less elevated. 



Occurs in California and Arizona. 



O. nervosa Panz.— Color variable. Vertex with median sulcus. Thorax 

 about one-third wider at base than apex, sides nearly straight, anterior angles 

 often prominent and dentiform, disc coarsely and deeply punctured. Elytra 

 elongate quadrate, slightly areuately broader posteriorly, margin feebly serrulate, 

 surface with eight rows of punctures separated by three entire costae, the first 

 distinctly broader. Length .14-. 16 inch; 3.5-4 millim. 



This species is extremely variable in color. The under side may be 

 either piceous or entirely pale. The head is usually dark, thorax often 

 pale, usually more or less maculate with piceous. The elytra are some- 

 times pale, with slight traces of darker spaces resembling in this respect 

 rubra, or the surface may be black with a few indistinct yellow spots. 

 The more common form has yellow elytra with piceous spots arranged as 

 follows: At scutellum and humeri, two spots on the first costa and one 

 opposite them at the side margin, a spot at the outer apical angle. These 

 often become connected by oblique extensions. The great number of 

 variations have given this species a large synonomy. 



Occurs everywhere in the Eastern regions, also in Arizona. 



TttA.NS. AMKH. KNT. SOC. X. (75) JULY, 1883. 



