42 



Labrum (PI. I., D, fig. 3) semi-oval, emarginate at the apex. 



Mandihleg (PI. I., D, fig. 4) small, streugthened with a strong dorsal costa, armed 



with many sharp teeth near apex. 

 Maxilhe (PI. 1., D, fig. 5) large, unilobed, with the lobe long and strong, abruptly 



recurved near the apex and very strongly hooked, armed with four large and very 



sharp teeth at the extremity, and furnished with u short and broad coriaceous 



process near the outer basal angle. Stipes very small. 

 Mentum (PI. I., D, fig. G, j) subquadrate, anterior margin excavated, with the 



angles acute. 

 Labium (PI. I., D, fig. 6, k) elongate-oblong, strengthened with lateral costfe, and 



furnished at the extremity with two sharp erect paraglossal processes on 



each side. 

 Lingua (PI. I., D, fig. 6, 1) small, fan-shaped, emarginate in fiont. 

 Pronotiiiit generally small, with the anterior margin entire, either circularly or 



ovallj' rounded, posterior angles not produced. 

 SnitiUuin small, generally rounded. 

 Kbitvd long, with their extremities rounded. 

 W'liujs large, elongate, with the membrane oval, broad at the base, hairy on the 



upper surface, and strengthened with the usual neuration. 

 Abdomen composed of seven segments, with the fom- basal coriaceous, and the three 



apical corneous. 

 Prothorax (PI. I., D, fig. 2, a) with the prostermim small, elevated between the coxse, 



and produced and much dilated behind them ; episterna minute ; cpiviera rather 



large, enclosing the coxal cavities behind ; coxal cavities large, rounded, and 



not contingent, partly open in front. 

 Pectus with the mesosternum (PI. I., D, fig. 2, d) moderate ; epistcnia moderate ; 



cpimcra rather large, humeral, not extending to the coxal cavities ; coxal 



cavities rounded and rather widely distant. 

 nictastcriium (PI. I., D, fig. 2, g) large, transverse, not extending to the sides of 



the body, posterior margin between the coxjb straight ; episterna large, much 



narrowed i^osteriorlj-, and rather longer than the metasternum ; epimera 



narrow, wholly covered by the epipleural fold of the elytra. 

 Venter composed of six segments, with the basal segment very large, nearly as long 



as all the rest united, the remainder equal to each other in length ; apical 



segment entire. 

 Legs anterior with the cox£e small, rounded ; trochanters narrow, elongate ; 



femora simple ; tibiaj moderate ; tarsi robust, 4-jointed ; 1 and 2 nearly 



equal; 2 bilobed; 3 minute; 4 elongate and slender; claws moderate, generally 



much curved, and incrassate on the under side of the base. 

 intermediate longer than the anterior, with the tarsi long and slender, with the 



two basal joints bilobed, the first longer than the second, in other respects 



similar to the anterior. 

 posterior like the intermediate. 

 Coxa anterior not contingent, scarcely prominent. 

 intermediate rather widely distant. 

 posterior broadly pyriform, not extending to the sides of the body, and widely 



distant from each other. 



The species of this extensive genus are in many cases difficult to distinguish 

 from each other, chiefly on account of the similarity of their superficial sculpture. 

 The slight differences which do exist, although sufficientlj- perceptible to the eye, 

 are extremely difficult to define intelligibly by description ; to say that one species 

 is more deeply punctured than some other implies the necessity of comparison, a 

 process often unattainable, especially among the rarer kinds. I have reason to 

 think that some of the species described in the following pages are merely local 

 races, but, since they have been considered by other authors to be distinct, I have 



