234 CALIFORNIA ACADEMY OF SCIENCES. 



cleft, the interior portion not very much shorter than the outer in the 

 front pair but more evidently so in the others. Abdomen with six dis- 

 tinct segments. 

 Length, 2.25 mm. 



Described from a single example taken at Pasadena, 

 November 2, 1899. 



By the tables given by Horn and Casey, S. megaceph- 

 alus falls near S. difficilis, S. phelpsii, and S. nebulosus, 

 from all of which the more parallel form and large head 

 will at once distinguish it. The sex of the type is not 

 determinable with certainty, but it is probably a female. 



43. Scymnus mimus, sp. nov. 



Resembles S. pallens exactly, and is only separable with certainty by 

 the male characters. These consist of a subtriangular impunctate area 

 surrounded by denser suberect pubescence at the middle of the posterior 

 margin of the first ventral, and the strongly impressed sixth ventral. In 

 S. pallens the first ventral of the male is unmodified, and the last is but 

 feebly impresso-emarginate. In S. mimus the abdominal punctuation is 

 distinctly finer and sparser, and there are but two pale segments, while in 

 S. pallens the last three are usually pale. 



There are two males in my collection, from Southern 

 California (Riverside and Pomona); the female has not 

 yet been identified. 



44. Scymnus dentipes, sp. nov. 



Broadly oval; black; head, sides of thorax in front, and rather narrow 

 apical space on the elytra, reddish yellow. Head and thorax rather 

 sparsely, elytra more coarsely and closely punctate. Beneath black, abdo- 

 men paler at apex, legs dull reddish yellow, the femora often more or less 

 clouded, especially towards the base. In the male the first ventral is dis- 

 tinctly longitudinally impressed at middle, both the impression and its 

 margin punctulate and bearing numerous fine erect hairs; the last ventral 

 is moderately impresso-emarginate, and the middle thighs are obtusely 

 dentate beneath, near the knees. 



In size, and in fact in all respects except the second- 

 ary sexual characters, this species is scarcely distin- 

 guishable from 8. fraternus, and is possibly confused 



