92 FOREST ENTOMOLOGY. 



being often an essential condition, — though, as they are rather fastidi- 

 ous as to tlie amount of moisture, it would be useless to look for them 

 in extremely wet places. 



SC0LYTID.E. 



The family is divided by Fowler into the following sub-families 



— viz.-.! 



I. First joint of tarsi (or metatarsus) much shorter than the 

 remaining joints united ; sides of thorax not emarginate 

 for the reception of the legs ; eyes oblong or divided ; head 

 never broader than thorax . . . Scolytinse. 



II. First joint of tarsi (or metatarsus) almost as long as the 

 remaining joints united ; sides of thorax emarginate for the 

 reception of the legs ; eyes round, subconvex ; head broader 

 than thorax ..... Platypodinse. 



ScOLYTINyE. 



This sub-family embraces the whole of the genera of Scolytidae, 

 with the exception of Platypus, which is a genus containing a single 

 species. The whole of the other species in the family are divided by 

 Fowler into the three following tribes : — 



I. Thorax not prolonged over the head, which is always in part 

 visible from above, and is terminated by a short snout ; 

 thorax without any marked asperities on its anterior portion ; 

 third tarsal joint nearly always bilobed. 



A. Abdomen strongly raised obliquely from near apex ; thorax 

 bordered at sides ..... Scolytina. 



B. Abdomen not, or only slightly, raised, as a rule regularly 

 cylindrical ; thorax not bordered at sides . Hylesinina. 



II. Thorax prolonged over the head, which is sunk in the thorax 

 when the insect is at rest, and is more or less globose ; 

 thorax almost always furnished with more or less distinct 

 warty asperities in front ; third tarsal joint simple 



Dryocaetina. 

 ^ British Coleoptera, vol. x. 



