168 Journal New York Entomological Society, [^'o'- ^i-"^- 



the spot, the beetle must have been in the act of migrating to a 

 colony of its summer host. F. inccrta, which is very abundant in the 

 same region. The beginning of May may therefore be set down as 

 the time of the spring migration. The migration from the incerta 

 back to the Camponotus nests takes place, in all probability, during 

 the last week of July or first week of August, since I have a record 

 of finding a very fresh and light-colored specimen of the beetle in a 

 nest of C. novehoracensis at Colebrook, Conn., July 28, 1910. These 

 dates indicate, therefore, that the breeding period of X. cava, or its 

 life with the definitive, or summer host, covers a period of only three 

 months, and that it spends the remaining nine months of the year 

 with its intermediate host. 



An examination of Dr. A. Fenyes's collection of Aleocharinse 

 during the past winter, enables me to add the following notes on the 

 hosts of two of the western species of Xcnodiisa : 



1. The type specimen of X. angusta in this collection was taken 

 from a colony of Camponotus fallax subsp. discolor var. clarithorax 

 living in a gall of Andricits pouiiformis on live oak (Qiicrciis agri- 

 folia) in the Gran Arroyo Seco at Pasadena, California. The Cam- 

 ponotus is therefore the winter host of this small Xcnodusa; its 

 summer host is probably F. piliconiis. the only Formica I could find 

 in the portion of the Arroyo in which the beetle was captured 



2. Dr. Fenyes showed me several specimens of X. montana which 

 he had taken from nests of C. Icvigatus at McCloud, Castle Crag and 

 Sissons, Cal., and a specimen of the same beetle found in a colony 

 of C. hcrculcanus var. inodoc at Tahoe City in the same state. Schwarz 

 had previously recorded C. Icvigatus as a host of X. moutaua. and 

 Wirtner has found it living with its summer host, F. subpolita. 



From the following table, which summarizes our present knowl- 

 edge of the hosts of our five Xcuoduscc. it will be seen that both hosts 

 are known of only two of the species : 



I. X. cava Leconte. 



SiDinncr Iwsts : Formica schaufttssi var. incerta (Wheeler) : F. e.rsec- 

 toides (McCook) ; IF. sanguinea subsp. rubicunda (Muckermann). 



Winter hosts: Camponotus herciileanus subsp. pennsylvanicus (Schwarz, 

 Blanchard. Pricer. Brues. Wheeler) and its var. ferrugineus 

 (Fenyes) ; C. hcrculcanus subsp. liguiperda var. novehoracensis 

 (Schwarz, Wickham, Muckermann, Wheeler) ; C. castaneus subsp. 

 americanus (Reiff and Strickland). 



