IN'ATUEAL EXEMIES. 
39 
alfalfa weevil the possibility of permanent establishment and future 
efficiency in the case of these species seems rather more encourag- 
ing than in case of the others. During June, 1911, 40 individuals 
reared from imported cocoons were placed in field cages artificially 
overstocked with weevil larvae, the cage covers being removed later. 
Besides this, there is at present on hand a considerable amount of 
hibernating material (PL XII, figs. 1, 2) artificially reared in the 
Murray laboratory (PL XIII, fig. 2), wliicli wiU be allowed to escape, 
naturally, into the alfalfa fields. 
Fig. 2b.— Canidiella curculionis, a parasite of the alfalfa weevil: Adult female; lateral view of abdomen 
of same below, at right. Enlarged. (Original.) 
The parasite Itoplectis masculator Fab. (fig. 26) differs from the 
preceding by reason of the fact that it pupates entirely mthin the 
pupa of its host. It is knoT\Ti to be a primary parasite, but the num- 
ber so far secured is too limited to warrant any discussion regarding 
it, or any predictions as to its future in America. 
Of the eighth and last of these parasites, Hemiteles sp., very Uttle 
is known either in Europe or America, and mth the obscurit}^ surround- 
ing its habits it may prove to be either a primary or secondary 
parasite, a friend or an enemy of the others. It is therefore being 
handled with the utmost caution, none having been liberated either 
in the fields or in field cages. 
