Excerpt from The Entomologist's Monthly Magazine, Vol. 3 of 28This must necessarily be different in those genera which infest Andrena, and those which attack Halictus, seeing that whereas the Halictus hibernates, the Andrenæ live for comparatively but a short time. Moreover, the Halicti all perish at the approach of winter. What, then, becomes of the parasite which is embedded in the body of these Halicti?I see no escape from the conclusion that all these perish also, and that only those females which are contained in the Halicti survive.This seems certain, as the larval parasites do not develop till after the hibernation of the bee. In the autumn, when the Halicti emerge, the body of the female parasite contains only multitudes of developing embryos, and it is only in the spring and early summer, after the hibernation of the bee, that the larvae of the parasite escape into its dorsal canal fully developed. Before this time the Halicti have all long since perished.The most puzzling part of the matter is that in some cases only the Halicti seem to be attacked by the parasite, the not at all, or, at least, very rarely. In 1886 and 1887, I took hundreds of Halictus tumulorum stylopized, but no, nor have I ever seen that sex attacked. In these cases, perhaps, the parasites (unlike the others above mentioned) do develop in the autumn, and are set free as larvæ before the death of the Halictus, and then hibernate in their first stage.It is certain that many of these parasites, especially those which infest Halictus, must be parthenogenetic. For instance, amongst all the H. tumulorum examined there was no sign of a parasite having escaped from any one of them.The species of Andrena and Halictus which I have myself found or seen recorded by others as being liable to be attacked are: -Halictus rubicundus, Chr. ; H. xanthopus, Kir.; H. 4-notatus, Kir.; H. albipes, Kir.; H. cylindricus, Fab.; H. nitiditcsculus, Kir.; H. minutissimus, Kir.; H. tumulorum, Linn.; H. morio, Fab.Andrena atriceps, Kir.; A. Trimmerana, Kir.; A.fulva, Sch.; A. nigroænea, Kir. ; A. Gwynana, Kir.; A. præcox, Scop.; A. varians, Rossi; A. labialis, Kir.; A. minutula, Kir.; A. nana, Kir.; A. Afzeliella, Kir.; A. Wilkella, Kir.No doubt other species could be added to this list by other Entomologists, as several of the species herein recorded, so far as I know, have not previously been noticed as stylopized.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.