302 



E. G. LINSLEY 



ecological significance as a group, being either wide-ranging forms 

 or species with restricted distribution isolated by events of the 

 late Tertiary and Pleistocene. 



Less than thirty species of Cerambycidae have been named from 

 these beds (Linsley, 1942). Among the species that are well enough 

 preserved to permit interpretation (Table III), about two-thirds are 

 northern types and some of these are very close to, if not identical 

 with, living forms. About half of these belong to genera that are 



Table III. Modern Occurrence of Some Genera of Cerambycidae 

 Represented in the Oligocene Beds of Florissant, Colorado" 



« Modified from Linsley (1939, 1942). 



^ Numerals indicate approximate number of known endemic species (widely dis- 

 tributed species excluded). 



now more or less equally represented in the present day Vancouveran 

 and Alleghenian subfaunas. Grammoptera, Anoplodera, Leptura, 

 and Gaurotes are flower-visiting forms of low host specificity associ- 

 ated with dead and decomposing conifers and hardwoods; Callimoxys 

 attacks Ceanothus and certain other shrubby plants (the fossil 

 form suggests the modern Alleghenian subspecies); Semanotus is 

 now associated largely with Taxodiaceae and Cupressaceae ; and 

 Phymatodes includes some species that attack conifers and some that 

 attack hardwoods (the fossil species resemble the latter). Six species 

 belong to genera better represented today in the Alleghenian sub- 



