LeConte.] 



SCOLYTID^:. 341 



Beak thick, neither dilated at tip, nor cylin- 

 drical, slightly narrowed from the base 



to the tip, convex 2. 



Beak very short, parallel on the sides 4. 



" longer, gula only feebly concave trans- 

 versely PHLCEOPHAQUS. 



2. Club rounded, pubescent, feebly annulated 3. 

 Club corneous, truncate at tip, which is 



spongy; funicle 5-jointed WOLLASTONIA. 



3. Funicle 5 jointed AM ATJRORHINUS. 



" 6-jointed HBXARTHRUM. 



" 7-jointed ELASSOPTES. 



4. Tarsi dilated, antennal grooves long RHYNCOLUS. 



" narrow, antennal grooves very short. . STENOSCELIS. 



The genera and species are fully described by Dr. Horn in the memoir 

 above cited, and need no farther mention at present. 



Family IX. SCOLYTIDJB. 



Mentum moderate in size, varying in form in some genera according to 

 sex; without gular peduncle (except in Hylastes, where it is very small) ; 

 ligula and palpi small, the former sometimes retracted, sometimes promi- 

 nent. 



Maxillae exposed, palpi stout and short. 



Mandibles stout, curved, more or less toothed on the inner side. 



Antenna? inserted on tha sides of the head, between the eyes and mandi- 

 bles ; composed mostly of scape and club, funicle usually very short, from 

 1- to 7-jointed; club large, solid, annulated, or rarely (Phlceotribus) lamel- 

 lated; surface of the club more or less sensitive according to genus. 



Head prominent in some tribes, deflexed and protected by the prothorax 

 in others; eyes usually large and transverse; beak never long, frequently 

 so short as to be not apparent. Labrum feebly developed, sometimes visible. 



Prothorax truncate in front, exposing the head, (Platypodida, Svolytini 

 and Hylurgirii), or prominent, convex and rounded (most Tomicini); lat- 

 eral edge not dis'inct,* and prosternal sutures obliterated] flanks excavated 

 for the partial reception of the front legs in Platypodida; coxal cavi.ics 

 usually confluent; separated in a few genera. 



Mesosternum triangular, pointed behind, or slightly truncate, episterna 

 (Platypodidfz) excessively large, ascending between the base of the pro- 

 thorax and elvtra with the epimera small, posterior and transverse, or with 

 tin; suture very indistinct; coxte rounded, not widely separated. 



Metasternum long, sometimes, (Platypodidce) very long; side pieces 

 parallel, or nearly so, not dilated in front. 



Legs mod3i-ate in length, rather stout, front coxae almost always con- 



*Kxcrpt in S-ftJi/tiifi. Ent.omuft, as has been elsewhere observed is not ti Rliyn- 

 rhophorous insect but allied to Jfhipidandrus. 



