44 THE CANADIAN ENTOMOLOGIST. 



Tetraopes, Serv. 



Moderate sized, stout insects, with short antenrue and strongly 

 tuberculate thorax. They are found on Asdepias, the common milkweed, 

 in the stems and roots of which they are said to breed. The two 

 Canadian species may be known thus : 



Smaller (.32-. 48 in.) ; body beneath, legs and antennse, black. 

 Above red ; scutellum, four spots on the thorax and elytral 

 markings (a spot on the umbone, a large median heart-shaped 

 blotch and broad common apical space), black. These mark- 

 ings are liable to some variation through extension or diminu- 

 tion . . cajiteriator, Drap. 



Larger (.36-.56 in.) ; ground colours and thoracic ornamentation 

 about as in the preceding species, the front angles and basal 

 margin sometimes also dark. Elytra with umbonal, two ante- 

 median (one subsutural, one discal) and one post-median spot on 



each, black tetraophthaltnus, Forst. 



The bibliography of the North American Cerambycidae is very exten- 

 sive. Aside from detached descriptions of species and biological notes, 

 the following papers, which are more or less synoptic or monographic in 

 form, are recommended for consultation : 



1847. Haldeman, S. S. Materials towards a history of the Coleop- 

 tera Longicornia of the United States. Trans. Am. Phi!. Soc. Additions 

 and corrections to same, Proc. Am. Phil. Soc, Vol. IV. 



1 850-1 85 2. Leconte, J. L. An attempt to classify the Longicorn 

 Coleoptera of America north of .Mexico. Jour. Acad. Nat. Sci., Phila. 



1873. Leconte, J. L. New species of North American Coleoptera, 

 Part IL, Smithsonian Institution. Contains tables of several genera. 



1878. Horn, Geo. H. Notes on some genera of Cerambycida; of the 

 United States. Tr. Am. Ento. Soc. 



1880. Horn, Geo. H. Notes on some genera of Cerambycidse, with 

 descriptions of new species. Tr. Am. Ento. Soc. 



1885. Horn, Geo. H. Descriptions of some new Cerambycidae, with 

 notes. Tr. Am. Ento. Soc. 



1 884-1 890. Lcng, C. W. Synopses of Cerambycidae. Begun in 

 Bulletin Brooklyn Ento. Soc, Vol. VII., continued in Entomologica 

 Americana, Vols. I. -VI. Contains tables of all genera up to and includ- 

 ing the Lepturoides. The remainder are treated in a paper, cited below, 

 by the same author in collaboration with Dr. Hamilton. 



1890. Casey, Thos. L. Coleopterological Notices, II. .Ann. N. Y. 

 Acad, of Science. Tables of Ergates and Tragosoma. 



1 89 1 Casey, Thos. L. Coleopterological Notices, III. Ann. N. 

 Y. Acad, of Sci. Contains synopses of several of the smaller genera. 



1893. Casey, Thos. L. Coleopterological Notices, V. Ann. N. Y. 

 Acad. Sci. Tables of four genera. 



1896. Leng, C. W., and Hamilton, John, The Lamiin?e of North 

 A-inericft. Trans. Am. Ento, Soc. 



