TKIBE XVIII. BAIUNI. 377 



densely scaly. 



e. Apex of pygidium entirely hidden; males without sexual 



modifications of the antenna?. XIII. CENTRINUS. 



ee. Apex of pygidium exposed in both sexes; males with outer 

 joints of antennal funicle obliquely truncate, and the basal 

 joint of club with a large glabrous area on the inner side, 

 at the middle of which there is a tumid or dentiform pro- 

 cess; scutellum always densely clothed with white pubes- 

 ence, this sometimes abraded. XIV. ODONTOCORYNUS. 



dd. Mandibles with inner edge straight, finely toothed or crenulate. 



f. Antennae inserted behind middle of beak. 



g. Front coxa? narrowly separated; body densely scaly; form 

 oblong-oval; smaller, not over 3 mm. XV. CENTRINOPUS. 

 gg. Front coxa? widely separated; body subglabrous; form 

 broadly oval; length more than 3.5 mm. 



XVI. PACHYBARTS. 

 ff. Antenna? inserted at or in front of the middle of beak ; front 



coxa? narrowly separated. 

 h. Thorax not tubulate at apex. 



i. Form broadly oval; metasternum very short; body above 

 usually subglabrous. XVII. MICROCHOLTTS. 



ii. Form narrowly oval; metasternum longer; body above 

 densely scaly, the scutellum conspicuously so. 



XVIII. NICENTRUS. 



hh. Thorax strongly constricted behind apex, the latter tubu- 

 late. XIX. CENTRINITES. 

 cc. Mandibles not prominent, thick, curved, crossed when closed, 



deeply notched at apex. 



;'. Elytral stria? almost obsolete, each terminating at base in a 

 deep fovea. XX. OOMORPHIDIUS. 



'/./ Elytral stria? normal, not foveate at base. 



A\ Body without erect bristles; third tarsal joint dilated and 



bilobed. 



7. Metasternum long, much more than one-half as long as its 



episterna; males often with spines before front coxa?; 



form narrowly oval. XXI. LIMNOBARIS. 



II. Mestasternum shorter, not more than one-half as long as 



the met-episterna; prosternum not armed in males, ex- 



except occasionally in Idiostethus : form broadly oval. 



m. Antennal club small or moderate; vestiture very sparse 



but distinct. 

 n. Thorax not tubulate at apex; prosternum flat. 



XXII. OLIGOLOCHUS. 



nn. Thorax tubulate; prosternum broadly impressed, 



deeply excavated in front. XXIII. IDI-ISTETIICS. 



mm. Antennal club very large, nearly as long as 'funicle; 



body almost glabrous. XXIV. STETIIOISARIS. 



Jfk. Body subglabrous, but with erect bristles; third tarsal joint 



slender, not dilated; very small, less than 1.8 mm. 



XXV. ZAGI.YPTT'S. 



