H. C. FALL. 147 



truncate, all the angles minutely prominent. Elytra parallel, one- 

 third wider than, and more than three times as long as the prothorax, 

 and nearly twice as long as wide. Beneath shining, sparsely pubes- 

 cent, obsoletely sparsely punctulate. Length, 4-4.3 mm. ; width, 

 1.6-1.9 mm. 



Sierra Madre Mountains near Pasadena, California — Sep- 

 tember. 



I am indebted to Dr. Fenyes for my representatives of 

 this most interesting species, which seems to be truly an 

 autumnal one. 



The above description applies to the male, the only female 

 at hand differing in having the head not wider than the pro- 

 thorax, and in entirely lacking the reddish tint present on 

 certain parts of the body in the male. In the latter sex the 

 last ventral is rather broadly deeply impressed in apical half, 

 the impression narrowing in front, and the basal joint of the 

 front and middle tarsi is parallel sided instead of narrowed 

 basally as in the female. These basal joints though obvi- 

 ously feebly dilated are still very slender, being about four 

 times as long as wide. 



OPHRvEA Jacoby. 

 This genus has been established by Jacoby for a small 

 number of Mexican species, which while structurally nearly 

 identical with Galerucella differ by their shorter antennas and 

 nearly impubescent and finely rugose elytra. Some are 

 posteriorly dilated, others not. Rugosa Jac, to which the 

 species described below seems closely allied, is put in the 

 group with dilated elytra, but the description says nearly 

 parallel, and the plate indicates this. 



O. arizonica n. sp. 



Oblong oval, black, prothorax rufous with median elongate black 

 spot ; surface dull, the elytra with sparse exceedingly short and scarcely 

 visible pubescence ; punctuation of upper surface very dense, the punc- 

 tures in actual contact or very nearly so throughout, coarser on the pro- 

 thorax and basal parts of the elytra, becoming gradually finer apically. 

 Antenna? less than half the length of the body, third and fourth joints 

 equal. Prothorax fully twice as wide as long, widest behind the mid- 

 dle, sides arcuately convergent in front, the anterior angles minutely 

 prominent, suddenly sinuate behind the point of greatest width, becom- 



TRANS. AM. ENT. SOC, XXXVI. JUNE, 1910. 



