36 Bulletin Americati Museum of Natural History. [Vol. XXIII, 



Blanchard in 1879,^ described in a brief note the capture of some 50 

 specimens of A '. cava in a large colony of black ants, which could only be 

 Camponoius herculeanus pennsi/lvanicus De G., in a white oak near Tyngs- 

 boro, Massachusetts. The word "recently" occurring in this note, which 

 was dated May 1, shows that the Xenodusa' must have been taken during 

 the winter or early spring and that they were hibernating with the Camponotus. 

 Hamilton, who published a good list of American myrmecophilous beetles 

 in 1888,^ had apparently never taken Xenodusa, as he cites only the records 

 of Leconte and Blanchard. Schwarz, in 1890,^ mentions the insect as 

 occurring with C. pennsylvanicus and C. ligniperdus var. novaehoracensis 

 (=pictus Forel) on his own authority and that of Leconte, Pergande, and 

 Hubbard. Wickham,* also records it as occurring with C. nofa'boracensis 

 at Iowa City, Iowa. 



In a recent paper Muckermann,^ has inaugurated a slight advance in our 

 knowledge of the habits of Xenodusa. Aug. 23, 1900, he succeeded in find- 

 ing it in the vicinity of Prairie du Chien, Wisconsin, in a nest of novoehora- 

 censis, and during October of the following year he found within a hundred 

 feet of this nest a colony of Formica sanguinea ruhicunda containing a 

 number of pseudogynes. The circumstances indicated a causal connection 

 between the occurrence of the pseudogynes and the parasites very similar to 

 the connection established in Europe by Wasmann for the heteroecious 

 Atemeles. It must be expressly stated, however, that Muckermann did not 

 find Xenodusce, either as adults or larvse, in the rubicunda nest. And to my 

 knowledge no one has yet taken the beetle in colonies of any of the Amer- 

 can forms of sanguinea. 



Up to the present time I have been able to find A', cava only in two 

 localities: Rockford, Illinois and Colebrook, Connecticut. These are, 

 to be sure, the very localities in which I have collected ants most carefully. 

 The following is the only- observation made at Rockford: August 5, 1902, 

 I took two fine specimens of A", cava from a large and flourishing colony of 

 C. novaehoracensis in an old log completely riddled with the galleries of the 

 ants. Neither Xenodusa larvfe nor pseudogynes were seen. The nest was 

 well stocked with Camponotus larvte and pupse in all stages and also contained 

 several fine winged females. There were many rubicunda nests in the 

 immediate vicinity but no pseudogynes were to be found among their 

 inhabitants. 



1 Bull. Brooklyn Ent. Soc, II, 1879, p. 4. 



2 Catalogue of the Myrmecophilous Coleoptera, with Bibliography and Notes Canad. 

 Entom., XX, 1888, No. .5, p. 164. 



3 Myrmecophilous Coleoptera Found in Temperate North America. Ent. Soc. Wash., I, 

 No. 4, 1890, p. 243. 



4 Further Notes on Coleoptera found with Ants. Psyche, VII, 1894, p. 80. 



^Formica sanguinea subsp. ruhicunda Em. and Xenodusa cava Lee. Ent. News, Dec. 1904, 

 pp. 339-341, pi. XX. 



