266 CALIFORNIA ACADEMY OF SCIENCES. 



line, and the raised lines mostly pale yellow; cuneus 

 orange, tipped with clear brown; membrane pale smoky 

 with the veins 3'ellow at base and brown at tip. Venter 

 rufo-fulvous, with an arcuated dark brown band before 

 the middle. 



Length to tip of venter, 5-5 ^4 mm. Width of prono- 

 tum. 2^/(— 2 3/j^ mm. 



This species is not rare at Los Angeles and various 

 parts of southern California. A single specimen (?) of 

 the large variety was secured at San Jose del Cabo by 

 Dr. Gustav Eisen. 



Thyrillus gen. nov. 



General aspect of Rhopalotomus; hairy, head thick, 

 nearlv vertical, the face prominently tumido-convex, the 

 throat swollen, the eyes projecting laterally and superi- 

 orly, vertex somewhat depressed above, having a short 

 broad middle groove, the occipital carina rising high above 

 the surface of the vertex, the base of antennae placed 

 some distance below the eyes, with the basal joint but 

 verv little thicker towards the apex, the second joint long 

 and rod-shaped and the following joint not abruptl}^ more 

 slender; superior cheeks oval and swollen, the space be- 

 low the e3'e almost flat; basal joint of rostrum wide and 

 thick, reaching to near the middle of the anterior coxa?. 

 Mucro of the prosternum long triangular, depressed : 

 lateral margin continuously but irregularly carinate ; col- 

 lum wide, sharply defined, more or less depressed; the 

 pleural flaps carried down long and almost triangular. 

 Scutellum a little longer than wide, bluntly ridged and 

 acuminate at tip. The costal border strongly and sharply 

 recurved at base and sunken on the submargin. Cuneus 

 depressed, the inner border at base thickened. Legs 

 long. 



