12 LAEV^ OF THE PRIONIN^. 



Eusternum of prothorax partially or entirely, and the lateral zone, 

 distinct; coxal lobe large, surrounded by large hypopleuruna; meso- 

 thoracic spiracle protruding into prothorax. 



Lateral zone of abdomen protuberant only on last three segments; 

 hypopleurum distinct; parascutal and coxal lobes large; spiracle in a 

 well defined, elliptical region. Ambulatory ampullae bearing two 

 transverse dorsal impressions and one ventral impression. 



Ninth abdominal segment large, extended, never telescoped 

 within the eighth. 



Key to the Genera of the Prionin^. 



Epistoma not projecting over clypeus. Posterior area of pronotum and the 



ampullae asperate (PI. Ill, fig. 1) Parandra. 



Epistoma projecting over clypeus, front either dentate or carinate. Neither 

 pronotum nor ampullae asperate. 

 Presternum and eusternum of prothorax partly fused, not completely 



divided by suture (PI. II, fig. 1) I. 



Presternum and eusternum of prothorax divided by well defined curved ' 

 suture (PL II, fig. 2) II. 



I. Front produced in a smooth transverse carina or not at all. Anterior 



area of lateral zone of prothorax bearing a group of short conical 

 chitinous spines (PI. II, fig. 1). Last joint of palpi very small, 



blunt Mallodon, Stenodontes. 



Front produced in a transverse dentate carina divided in middle 

 (edge not acute). Lateral zone not armed. 

 Carina distinctly divided into four broad lobes; last joint of 



maxillary palpi shorter than second ; texture rugose . . Derobrachus. 

 Carina not distinctly divided into four broad lobes; last joint of 

 maxillary palpi longer than second, acutely conical; texture 

 smooth Orthosoma. 



II. Front projecting over epistoma, dentate. Last joint of palpi con- 



ical. Pleural disc finely rugose, distinct on first three or four 

 abdominal segments. Labrum as long as or longer than wide. . A. 

 Front projecting over epistoma in a transverse carina, never dentate. 

 Last joint of palpi cylindric. Pleural disc radially striate, dis- 

 tinct on six abdominal segments. Labrum wider than long (PI. 



Ill, fig. 3) Prionus. 



A. Body texture dull, finely and densely rugose (PI. VI, fig. 2).. a. 

 Body texture smooth, shining b. 



a. Ocelliscarcely visible, fused in pleurostoma. Front of head 



bearing four large, blunt, rounded teeth (PL III, fig. 7) 



Ergates. 



Ocelli 3 to 4, prominent. Front bearing four broad, flat- 

 tened, acute edged, dentate teeth (PL III, fig. 1). . Tragosoma. 



b. Front bearing four regular, flattened, acuminate teeth (PL 



III, fig. 5), three prominent obovate ocelli Sjphenostethus. 



DESCRIPTIONS OF LARV^ OF PRIONIN.E. 



Parandra brunnea Fab. 



Form cylindric, slightly tapering; texture smooth, shining, very 

 sparsely pubescent. 



Head suborbicular from above, not strongly chitinized; gena hav- 

 ing a shallow constriction behind middle. , Epistoma roundly 



