STRUCTURES USED IX CLASSIFICATION. 7 



we beg the reader to bear them in mind in judging the result, 

 hoping that our book may be of service to him in spite of its 

 shortcomings, and that it may serve eventually as the founda- 

 tion for a better one. 



EXPLANATION OF STRUCTURES USED IN THE CLASSIFICATION 



OF RHYNCHOPHORA. 



As set forth by LeConte and Horn (188:5, p. XXIX) and by 

 the senior author in his "Coleoptera of Indiana" (p. 25), the sub- 

 order Rhynchophora is separated from the suborder Coleoptera 

 genuina, by having the head more or less prolonged into a beak; 

 palpi rigid and labrum absent (except in Anthribid;ie and Rhino- 

 macerime) ; gular sutures confluent on the median line and the 

 prosternal sutures wanting. The names of the principal external 

 parts used in this work in the classification of Rhynchophora arc 

 shown in the accompanying figure. 



pronotum 



front 



eye _ 

 ffrooyt , _ 



scape 



funicle 

 dub- 

 beak 



elytra 

 -- declivity 

 -- stria 

 --interval 

 - ventral seomenks 



femur 



-tibia 

 ,. tarsi 

 .daws 



o 



Fig. i. 



Pissodes fraseri Hopk., showing names of principal external structures. 

 (Adapted from Hopkins by Edw. D. Harris.) 



Many details are omitted in this figure for the purpose of 

 showing more clearly the names of the principal parts to which 

 constant reference will be made in the text. Figures showing all 

 external parts in greater detail will be found on a later page 

 under the family Scolytidae. 



The names of the parts of the head are shown in Fig. 2, drawn 

 on a larger scale. 



