Vol. VI] VAN DUZEE—SPECIES OF ORTHOTYLUS 107 



Type, male, and allotype in author's collection. Paratypes 

 in Museum of California Academy of Sciences (Nos. 313- 

 315), collection of the University of California and author's 

 collection. 



Group III (Subgenus Diommatus Uhler). 

 16. Orthotylus languidus, new species. 



Larger than dorsalis, elongated, with somewhat the aspect 

 of a Plagiognathus; a pale immature looking insect with faint 

 fuscous markings in the male. Length 5^ mm. to tip of 

 membrane. 



Vertex flattened, the basal carina prominent, the impres- 

 sion before it forming two fovse as in most of the dorsalis 

 group. Front convex, especially in the female. Eyes large; 

 in the male two-thirds the width of the vertex, in the female 

 about one-half. Antennae rather short. Pronotum long, its 

 length two-thirds its basal width; sides very feebly concave, 

 the anterior angles well rounded; callosities large, prominent. 

 Elytra nearly parallel, the costa a little arcuated; almost sub- 

 hyaline in texture; apex of the abdomen in the male reaching 

 the middle of the cuneus, in the female attaining its apex. 



Dextral hook of the male genitalia large, very broad and 

 convex at base, the apex rather abruptly narrowed and in- 

 curved with its apex rounded ; sinistral small, linear, lying along 

 the lower margin of the very deep sinistral notch. 



Color pale whitish-testaceous, with the elytra almost diaph- 

 anous and the typical markings much reduced. Upper surface 

 clothed with rather long and dense pale hair. In the female 

 the colors are almost uniform over the whole surface, with 

 only the extreme tips of the tarsi infuscated. The male is 

 quite distinctly clouded with brown or fuscous on the disk of 

 the vertex and on the pronotum behind the callosities, and 

 there is a faint cloud at the apex of the clavus and two elon- 

 gated ones before the apex of the corium ; the membrane also 

 has an elongated fuscous mark beyond the apex of the areoles. 

 Sides of the basal lobe of the scutellum black. Abdomen and 

 sternum more or less infuscated with the connexivum paler. 



Described from numerous examples taken on willows at 

 Mussey's and at Grossmont in San Diego County, Calif., in 



