2g4 CALIFORNIA ACADEMY OF SCIENCES [Piioc. 4th Ser. 



Described from four males and four females taken by Mr. 

 Giffard at Niles Canyon, May 23. 1917; on the Tunnel Road 

 near Oakland, May 13, 1917; in Santa Cruz Co., June 7, 

 1917, and near Stockton, May 30, 1917. 



Holotype (No. 358), male, from Tunnel Road, in collection 

 of the California Academy of Sciences. 



Allotype, female, in collection of Mr. Giffard. 



Paratypes in both collections and in that of the author. 



167. Plagiognathus diversus pluto, new variety 



Here the pale color has entirely disappeared, except on the apex of the 

 coxae and base of the femora. The elytra, including the cuneus, are en- 

 tirely black, excepting that the slender base of the membrane and a spot 

 on the apex of the areoles is whitish. The second antennal segment here 

 is as slender as in the species. 



Described from two male and three female examples taken 

 by Mr. Gififard in Santa Cruz Co., June 7, 1917. 



Holotype (No. 359). male, in collection of the California 

 Academy of Sciences. 



Allotype, female, and paratypes in collection of Mr. Gififard. 



168. Plagiognathus confusiis Rent. Santa Cruz Co., June 

 14, 1917. 



169. MicrophylcUus bkinctus (Van D.) Redwood Canyon, 

 August 6, 1916; Portola Valley. San Mateo Co., May 14, 

 1917. 



170. Atractotomus hcspcrins ]\eut. h^illcn Leaf Lake, Au- 

 gust 21, 1916. 



171. Excentricus calif ornicus, new species 



Smaller than the luiropcan species; black, above clothed with white 

 scale-like hairs and pale pul)esccnce ; basal two segments of antennae much 

 thickened in the female. Length 3 mm. 



Female: Head long, subrostrate, but moderately deflexed or sub-por- 

 rect. Vertex but gently arcuated, its base ecarinate. Clypeus narrow, 

 prominent, bent so its apex becomes nearly vertical, but little exceeding 

 the cheeks, its basal suture distinct, a little anterior to the insertion of 

 the antennae; facial angle almost a right angle; gula nearly horizontal. 

 Antennae stout; basal segment strongly clavate, its apical thickness nearly 

 one-half its length, exceeding the clypeus by one-fourth its length ; second 

 segment fusiform about as long as the basal, as thick at its middle as the 

 diameter of the eye viewed from before ; both these segments clothed with 

 fine appressed black hairs ; third and fourth very slender, together as 

 long as the second; third a little longer than the fourth. Pronotum 

 trapezoidal, its margins nearly rectilinear, the sides curving a little to the 



