Dec, 1916.] Notes on Ceutorhynchus marginatus. 243 



Observations on white ants; meeting, December 19, 1905. 



North American forms of the genus Strategits ; meeting, December 18, 

 1906. 



Exhibition of pamphlet by Spinola, 1839, wherein are described and 

 figured a few species of peculiar Coleoptera; meeting, January 15, 1907. 



The Ptinid beetle, Gibbium scotias, collected by Wm. T. Davis in the 

 New York Produce Exchange; meeting, April 2, 1907. 



Exhibition of Cynthia and Promethea moth hybrids with remarks on the 

 same; meeting. May 21, 1907. 



Some curious results of the crossing of Cynthia and Promethea moths 

 and some interesting variations of Cynthia; meeting, November 19, 1907. 



Differences in the color of adult moths affected by feeding the cater- 

 pillars in the dark; meeting, March 3, 1908. 



On the habits of the white ant. Vermes flavipes ; meeting, October 19, 1909. 



A Scarabaeid new to Long Island, Trichius texanus Horn, collected by 

 Mr. Engelhardt ; meeting, March 15, 1910. 



Thelydrias contractus difficult to kill with bisulphide of carbon; meeting, 

 May 3, 1910. 



BIOLOGICAL NOTES ON CEUTORHYNCHUS 

 MARGINATUS PAYKULL (COL.).^ 



Bv S. W. "Frost. 



Ithaca, N. Y. 



During the past season the writer found the larvae of a small 

 beetle feeding on the ovules and seeds of the dandelion. This insect 

 attracted much attention, for little seemed to be knov^n about it. 

 Specimens were sent to C. W. Leng, who identified them as Ceutor- 

 hynchus marginatus Payk., a European species heretofore unknown 

 to America. The abundance of the insect, its interesting habits, and 

 undoubted economic importance induced the writer to make a study 

 of its life history. 



At this point the writer wishes to express his thanks to Dr. Robert 

 Matheson who has assisted greatly in correcting and arranging this 

 paper. 



Historical. 



From an examination of the European literature it appeared that 



very little was known of the life history and habits of this beetle. It 



1 Contribution from the Entomological Laboratory of Cornell University. 



