290 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Color a bronzy grey-brown, much as in plagiatus, varying to deep black, 

 when immature pale and tinged with green. In pale examples the coUum 

 is yellowish and the callosities black, sometimes sending an indistinct 

 blackish ray either side the middle and another next the lateral margins. 

 Scutellum in pale examples with a black geminate median vitta omitting 

 the extreme tip which remains pale in the darkest individuals. Apex of 

 corium with a blackish cloud which is more extended as the individual 

 becomes darker. Extreme tip of clavus black. Cuneus always pale with 

 the tip black ; sometimes it becomes rosy red but this color does not seem 

 dependent upon maturity. Membrane faintly enfumed with the nervures 

 yellowish or even red ; apex of the larger areole with a fuscous cloud 

 which send a ray to the apex. These parallel rays are normally separated 

 by double their own width but they may become extended so as to cover 

 much of the surface. Antennje black ; second segment pale with its ex- 

 treme base and apical one third black; narrow base of third segment pale. 

 Femora black in mature examples, the anterior and intermediate pale 

 when immature, more or less invaded with black ; tibiae and tarsi pale, the 

 narrow base and apex of the tibiae and apex of the tarsi black. Beneath 

 black with a large ivory-white spot on the orificies ; either side with a 

 longitudinal pale vitta in pale examples which becomes nearly or quite 

 obsolete in black specimens. Whole surface with a short pale pubescence 

 which is easily rubbed off. 



Described from four male and ten female examples taken 

 from yellow sand verbenas (Abronia latifolia), growing on 

 the sand dunes at Ingleside, San Francisco, March 24, 1918. 

 A few nymphs and immature were taken with these adults. 

 This species is perhaps nearest to plagiatus in many of its char- 

 acters but its true relationship is with riihicundus from which 

 its larger size, punctured hairy face, more convex pronotum, 

 black femora and different coloration, especially of the mem- 

 brane, will distinguish it. It pertains to Knight's pratensis 

 group. 



Holotype (No. 410), male, and allotype (No. 411), female, 

 in collection of the California Academy of Sciences. 



Paratypes in collection of the Academy and in that of the 

 author. 



20. Pilophorus discretus, new species 



Allied to zvalshi, a little smaller and more constricted at the 

 middle ; fulvous-brown, elytra paler, the apical silvery line 

 oblique but not dislocated, the polished outer half of the corium 

 beyond this line abruptly fuscous. Length about 4 mm. 



Head more produced than in zvalshi, its length before the eye distinctly 

 more than the length of the eye, in zcalslii about the length of the eye ; 

 base of the vertex depressed, sharply, slenderly carinate behind. Basal 

 segmient of rostrum not exceeding the bucculae. Pronotum polished ; sides 

 almost parallel anterior to the middle or a little constricted at the middle, 

 the humeri angularly prominent; hind margin distinctly concavely arcu- 



