1922] Ball and Hartzell: Review of Orgerini 139 



KEY TO THE N. A. GENERA OF ORGERINI. 



A. Callosity behind eye; vertex elongate or angulate. 



B. Vertex elongate, with more than one-half its length beyond the eyes. 

 C. Cephalic process truncate at the extremity. Five-angled. 



D Cephalic process gradually tapering as seen from both top and side. 



Apex small Orgamara Ball. 



DD. Cephalic process parallel margined; apex as seen from the side slightly 



enlarged; projecting at an angle with vertex Yncanda nov. gen. 



CC. Cephalic process as seen from side, beak-like, the apex obliquely roundmg 



from above, the lower angle slightly produced Deserla nov. gen. 



BB Vertex angulate, narrowing from the eyes, less than twice the length of 



the eye Orgerms Stal. 



AA. No callosity behind eye; head rounding or if elongate, broad, if seen from 

 the side. , • j • 



E. Vertex angulate, produced in front of the eyes at least one-third its 

 length. 

 F. Head twice the length of the eye as seen from the side, widenmg 



toward the tnmcate apex Acinaca nov. gen. 



FF. Eyes contigious to pronotum; head distinctly less than twice 

 the length of the eyes; as seen from the side, distinctly narrowing 



and roundingly truncate Aridia nov. gen. 



EE. Vertex broad and short, scarcely longer than its basal width. The 

 lateral carina of the front closely margins the eye clear to its juncture 

 with the lateral margin of the vertex. 



G. Fore and middle tibia broadly foliaceous Timodema Ball. 



GG. Tibia normal. 



H. Lateral carinas of the frontal tablet uniting some distance 



below the apex of the head Ticidia Uhl. 



HH. Lateral carinse of the frontal tablet narrowing but not uniting 

 before joining the vertex Timonidia nov. gen. 



Orgamara Ball. 

 Resembling Orgerius Stal but with the vertex produced into 

 a long stylate process, similar to that found in Scolops, but 

 stouter. 



Cephalic process long, tapering, nearly twice the length of the eye, 

 truncate apically, but slightly inchned to the plane of the_ vertex. 

 Front straight in profile, tricarinate, the lateral carinae narrowing near 

 the apex but not uniting with the median. The carina from the lower 

 corner of the eye running obliquely to the upper margin of the snout at 

 or beyond the middle; below this carina, the front is pustulate. _ A 

 transverse carina sets off the posterior third of the vertex ; median 

 carina of the vertex extending onto the cephalic process a slight dis- 

 tance. Eye separated from the pronotum by an elongate callosity. Pro- 

 nottun with a central raised tablet, tricarinate, the lateral extensions 

 sloping strongly downward and backward, pustulate. Elytra covering 

 the second segment of the abdomen, irregularly reticulate; a row of 

 pustules near the posterior border of each segment. Legs long, slender, 

 terete; hind tibia with 5-6 weak spines. Rostrum about equalling the 

 abdomen. 



Type of the genus 0. acuta Ball. 



