April, 1916 Bulletin of the Brooklyn Entomological Society 47 



Columbia. Mr. Sladen points out that this is the first reported 

 occurrence of a Psithyrus inhabiting a nest of a Bombits in the 

 New World. 



In addition it might be well to record the finding, by myself, 

 of both sexes of the Psithyrus variabilis Cress., inhabiting the 

 nest of Bombus pennsylvanicus De Geer at Champaign, Illinois. 

 During September, 1910, I had occasion to open several surface 

 nests of Bombus pennsylvanicus. Of a total of seven nests, four 

 contained Psithyrus variabilis. Again, on September 14, 191 5, 

 one female of Psithyrus variabilis was found in a surface nest of 

 Bombus pennsylvanicus. In one of the nests examined Septem- 

 ber, 1910, were found thirty males and twelve females of Psith- 

 yrus variabilis, along with fifty-one Bombus. In the other three 

 nests the number of inquilines varied from one to five. In the same 

 nest containing the Psithyrus females, were to be found the living 

 Bombus queens. Apparently, as in the case of the Psithyrus 

 insularis, the female of Psithyrus variabilis does not kill the queen 

 Bombus. 



Hibernating Hydrophilidse. — Mr. Fred Wintersteiner, who is 

 studying the habits of this family, reports the capture near Rich- 

 mond, Va., during the last week of January of adults of Phil- 

 hydrus nebulosus, P. ochraceus, Tropisternus glaber, T. lateralis, 

 Creniphilus subcupreus, and Cymbiodyta fimbriata. 



WANTED. — All kinds of material for Life Histories. Lepidoptera, 

 Coleoptera, Hyneoptera, Diptera, etc., etc. Herman H. Brehme, 74 13th 

 Avenue, Newark, N. J. 



WANTED. — Transactions American Entomological Society, Vol. IV ; 

 Proc. U. S. Natl. Museum, Vol. X, pp. 335-337 ; Vol. XI, pp. 481-525 ; 

 Vol. XII, pp. 455-496. Howard L. Clark, Box 1142. Providence, R. I. 



FOR SALE.— Entomological News, Vols. XV to^ XX, inclusive, un- 

 bound, at subscription price, six vols., $6. Geo. P. Engelhardt, Museum, 

 Brooklyn, N. Y. 



