June 1899.] Casey : On American Coccinellid.e. 137 



Did ion, gen. nov. 

 This genus resembles Scymnus in most of its structural features, but 

 differs in its narrow prothorax with rapidly converging sides, small, 

 deeply inserted but feebly inclined head, with narrowly oval eyes and 

 flat surface, in the feebly deflexed presternum, and especially the nar- 

 row and obliquely pointed last joint of the maxillary palpi. The pubes- 

 cence is rather abundant but very short and decumbent. Individuals 

 appear to be very rare, and the genus is confined as far as known to 

 the Upper California Sequoia belts. The two species represented be- 

 fore me may be defined as follows from the female only : — 

 Metacoxal plates more narrowly rounded, extending extremely near to the suture, 

 black throughout, the legs piceous ; body oval, convex, moderately shining, the 

 head finely, sparsely punctate, the eyes widely separated ; prothorax not quite 

 twice as wide as long, about two-thirds as wide as the elytra, the sides strongly 

 convergent and evenly but very feebly arcuate throughout, the punctures very 

 minute and inconspicuous ; elytra much longer than wide, evenly rounded at 

 apex, finely but strongly, rather closely punctate. Length 1.6 mm.; width 0.95 



mm. California (north of San Francisco) longulum, sp. nov. 



Metacoxal plates distant from the suture by a third or fourth of their own length ; 

 in coloration and sculpture nearly similar to longulum, the pubescence slightly 

 longer, the body much smaller, the prothorax rather more than twice as wide 

 as long, with the sides much less convergent but more strongly arcuate and 

 notably more discontinuous with those of the elytra, the latter more broadly and 

 obtusely rounded behind, much longer than wide. Length 1.25 mm. ; width 

 0.8 mm. California (Sonoma Co. ) parviceps, sp. nov. 



These species are both represented by single examples thus far, but 

 very recently Dr. Blaisdell has sent me a male from Calaveras Co., 

 which appears to be identical with parviceps. 



Selvadius, gen. nov. 

 Differs remarkably from Scymnus in its narrow parallel body, 

 exserted, feebly inclined and transversely orbicular head, small eyes 

 and longer straight antenna;. The maxillary palpi are larger than 

 usual in Scymnus, thick, with the last joint strongly securiform. The 

 single type may be described as follows : — 



Body narrowly oblong, rather feebly convex, moderately shining, piceous-brown in 

 color, with the legs, palpi and antenna: yellow ; punctures fine but strong and 

 close-set throughout, those of the elytra larger but shallower than those of the 

 pronotum ; pubescence short, fine and decumbent ; head relatively well developed 

 in size, feebly convex, the eyes small, convex, oval, entirely exposed before the 

 prothorax and entire, the vertex very broad between them ; antennae nearly as 

 long as the head, il-jointed, the second joint subglobular, three to five sub- 



