1922] Ball and Hartzell: Review of Orgerini 147 



inflated just above the eyes. Pronotum scarcely more than half as long 

 as the diameter of eye, sloping irregularly backwards to a mere collar. 

 Scutellrmi very small without a defined tablet. 



Color — Bright testaceous with the head and pronotum a bright 

 green. A belt covering most of the elytra deepening anteriorly and 

 encircling the insect below just back of antennas, dark shining brown to 

 black. The lateral caringe, median carina of the front and the margins 

 of the truncate cephalic process black-lined. Fore and middle tibia 

 lineate with light. 



Described from three pairs from Mo Java, California, taken 

 July 30, 1912. Other examples are at hand from Ravenna, Cal- 

 ifornia. This striking and easily recognized species was taken 

 only on one of the chaparall bushes, Eriogonum fasciculatum, 

 of the deserts and dry mountain slopes to which its color almost 

 perfectly adapts it. 



Aridia nov. gen. 



Resembling Acinaca, but with a shorter, broader, more 

 rounding cephalic process. 



Cephalic process broad and short, rounding at the apex, slightly 

 inclined upwards. Vertex broad, as wide as the eye, the median carina 

 fades out before reaching the apex. Front narrow, with very sharply 

 defined carinae; median carina of the front uniting with the lateral 

 carina in a five-sided figure. Frontal tablet linear, inflated just below 

 the eyes. No callosity behind the eyes, the eye and pronotum contig- 

 uous. Pronotum short, with median carina, without a central tablet, 

 pustulate. Scutellum with central tablet, with three sharply defined 

 carinae. Elytra brachypterous. Strongly reticulate. Abdomen ovate. 

 Abdominal segments with a row of pustules along posterior margin two- 

 thirds of the distance to the median line. Legs linear, not expanded. 



Type of the genus Orgerius compressiis Ball. 



Key to the Species of Aridia. 

 A. Cephalic process upturned at an angle of about 45°. Rostrum about 



equalling the abdomen A compressa Ball 



AA. Cephalic process flat or upturned but very slightly. Rostrum decidedly 

 longer than abdomen A. erecta Ball 



Aridia compressa Ball. 

 Orgerius compressiis Ball. Proc. Bio. Soc. Wash., Vol. XXII, p. 202, Dec, 1909. 



Resembling erecta, but with a longer, narrower more 

 upturned cephalic process. Length 4 mm. 



Cephalic process upturned at an angle of about 45°, slightly less 

 than the length of the eye, acutely angular with apex truncate. Front 

 narrower than in erecta, sharply carinated. Line through center of eyes 

 cutting slightly above the middle. Vertex long, angulate with faint 



