CURCULIONIDAE. 109 



A A. Antennae elbowed (in Magdalinus imper- 

 fectly). 



a a. Posterior angles of thorax at most right 

 angles, not prominent ; body not cylindrical. 



A a. Body not rhomboidal ; prosternum very 

 short before anterior coxae (in Acalyptus 

 of ordinary length, but tarsal claws simple). 



Peduncle of submentum slender and rather prominent ; 

 mandibles very short; rostrum not very robust, often slender, 

 cylindrical, variable in length, scrobes commencing near or 

 somewhat before middle, linear and reaching base ; eyes 

 nearly always rounded ; elytra leaving pygidium slightly 

 uncovered or not; tibiae not hooked; first tarsal joint 

 generally short ; claws variable. Anthonomides. 



-B h. Body rhomboidal ; prosternum long- 

 before anterior coxae. 



Peduncle of submentum slender and prominent; man- 

 dibles elongate triangular, prominent ; rostrum very long 

 and slender, scrobes commencing a little beyond middle, 

 linear, reaching base ; eyes transverse ; elytra generally 

 leaving pygidium slightly uncovered ; tibiae not hooked 

 (except sometimes anterior pair) ; first tarsal joint mode- 

 rately long; claws bifid or appendiculate. Balaninides. 



b h. Posterior angles of thorax acute, more or 

 less prominent ; body cylindrical. 



Peduncle of submentum tolerably long ; mandibles very 

 short ; rostrum tolerably long, cylindrical, scrobes com- 

 mencing in or slightly beyond middle, linear, reaching 

 base ; eyes transverse ; elytra not covering pygidium ; 

 tibiae hooked at apex ; tarsal claws simple. 



Magdalinides. 



-B jB, Antennae not elbowed. 



a a. All abdominal segments free. 



Peduncle of submentum variable in length ; rostrum 

 generally long, slender and dilated in front, scrobes shallow, 

 commencing in middle, generally linear, reaching base ; 

 pygidium covered or not ; intermediate coxae contiguous or 

 separated by process of mesosternum ; tibiae not hooked at 

 apex ; tarsal claws bifid or free. Bhinomacerides. 



