Bulletin of the Brooklyn Entomological Society Vol.X 



interesting thing in connection with their biology is the fact 

 that in many cases they are accompanied by different species 

 of the genus Rhyncholus. For instance, Rhyncholus orego- 

 nensis Horn, lives more or less in company with Cossonus cre- 

 natus Horn, and C. ponderosce n. sp., though generally preferring 

 the dryer parts of the trees, Rhyncholus pollens Casey with C. 

 lupina n. sp., and R. hrunneus Mann, with C. piniphilus Boh., and 

 so forth. The genus is of wide distribution, with species in both 

 the old and new world but with a dominance in the tropics, par- 

 ticularly of this hemisphere. 



South of us in Mexico and Central America there are a large 

 number of species and many of these are quite gaily colored. All 

 of ours but one are somber in appearance. 



In 1873 our species were reviewed by Dr. George Horn* the 

 number listed by him being eight, and this number was not in- 

 creased by 1885 when the Henshaw Check listf was published. 

 Since this time, however, two others have been described, C. hamil- 

 toni Slo'S'son:]: from Florida, described in 1899, and C. sulcirostris 

 Fall§ from Lower California, described in 1909, though this 

 latter was changed to C. falli Champion] | somewhat later because 

 the name was preoccupied by a Mexican species. Five more re- 

 main to be added. I have stated that there was some confusion 

 with regard to some of our species. Of Pacific species, the com- 

 mon, yet undescribed C. ponderosce n. sp. is generally mistaken 

 and labeled in most collections as C. piniphilus Boh., the latter 

 being generally lacking. C. impressus Boh. from Southern Flor- 

 ida is usually labeled C. impressifrons Boh. This misidentifica- 

 tion is traceable to Dr. Horn. The true C. impressifrons Boh. was 

 described from Pennsylvania and not recognized by him nor ap- 



* " Contributions to a Knowledge of the CurculionidEe of the United 

 States," by George H. Horn, Am. Phil. Soc, 1873. 



f'List of the Coleoptera of America, North of Mexico," by Samuel 

 Henshaw, Phil. 1885. 



J" A New Cossonus," by Annie Trumbull Slosson, Can. Ent., V, 31, 



P- 193- 



§ " New Coleoptera from the Southwest — IV," by H. C. Fall, Pasadena, 

 California, Can. Ent., 41 (1909), p. 169. 



II " Biolog. Centr. Amer. Insecta Col.," Vol. 10, pt. 7, p. 55- 



