316 THE CANADIAN ENTOMOLOGIST. 



SYNOPSIS OF THE NORTH AMERICAN SPECIES OF THE 

 GENUS CAPITONIUS BRULLE.* 



BY S. A. ROHWER, WASHINGTON, D. C. 



The North American species which are here placed in the 

 genus Capitonius have been referred to a number of genera, as 

 may be seen from the bibliography of the species which follows. 



Szepligeti (Gen. Insectorum, Braconidae) states that all our 

 species belong to the genus Cenocoelius Westwood. According to 

 the type species, as indicated by Viereck, Bull. 83, U. S. Nat. 

 Mus., Cenocoelius Westwood is founded on flavifrons, which is not 

 yet characterized, but Cenocoelius Marshall is synonymous with 

 Capitonius. Capitonius having priority is used for our species. 

 It may be possible by comparison with the type of Capitonius to 

 differentiate the North American species into a different generic 

 group, if certain Neotropical species are typical Capitonius of the 

 Neotropical region, but sufficient material is not available for such 

 study. From the material and notes available it is evident that 

 the species of the genus Capitonius are parasitic on wood or bark 

 boring Coleoptera, and from the notes it seems that they are all 

 internal parasites pupating after destroying the host within a 

 cocoon in the larval gallery. The following host relations seem to 

 be thoroughly established for the North American species: 



Liopus alpha and Lio pus fascicular is in sumach — Parasitized 

 by Capitonius ashmeadii and Capitonius provancheri. 



Lepto stylus (either macula or collar is) in chestnut — Parasitized 

 by Capitonius leptostyli. 



Lepturgus facetus in chestnut — Parasitized by Capitonius pro- 

 vancheri. 



Goes oculata in Oxydendrum. arboreum — Parasitized by Capi- 

 tonius nigrisoma. 



Micrasis in hickory — Parasitized by Capitonius provancheri. 



Synoxylon in hickory— Probably parasitized by Capitonius 

 carycB. 



Saperda Candida in elm — Parasitized by Capitonius saperdce. 



Contribution from the Branch of Forest Insects, Bureau of Entomology, 

 U. S. Department of Agriculture, Washington, D. C. 

 September, 1014 



