. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 153 \J' i and so much complaint has been made of it this spring that we shall publish an account of it in the next number, for the appearance of which wf beg our correspondent to wait. [Fig. 56.] Cynipid gall on Oak Twigs. —/. J. U\,Xo,t/! O/iio. —The gall which you send on the twigs of Qiu-rciis caslanea is new to our cabinet and evi- dently new to science, and if we hud this to be the case upon further inquiry, we will briefly describe it in these col- umns. It has some resemblance to that of C. ijui-rcus-ptiiutata Ba
. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 153 \J' i and so much complaint has been made of it this spring that we shall publish an account of it in the next number, for the appearance of which wf beg our correspondent to wait. [Fig. 56.] Cynipid gall on Oak Twigs. —/. J. U\,Xo,t/! O/iio. —The gall which you send on the twigs of Qiu-rciis caslanea is new to our cabinet and evi- dently new to science, and if we hud this to be the case upon further inquiry, we will briefly describe it in these col- umns. It has some resemblance to that of C. ijui-rcus-ptiiutata Bassett, which is found on Q. rubra. This last, however, is a much larger, more rounded and less elongate swelling, the diameter being 4 or 5 times that of the twig. The tlies bred from these galls, so far, always issue in the spring and are uni-sexual, all of them being females, and there is little doubt from our present know- ledge of dimorphism in these insects, that there is a bi-sex- ual form producing probably a totally different gall perhaps on some other part of the tree, as the bud or leaf. We should be very much pleased to have you watch the trees from which these galls were taken and send us whatever gall growths may be noticed thereon during spring and earl)' summer, as we may thus get at the real connection between this and some other gall. Your gall, which we illus- if^ ti "^'"^ (fig-56), is also very near " to C. i'-lhitata Bassett. The very close resemblance of many of the species producing stem swellings on our oaks ren- ders theirspecific determination difficult, and we never shall un- derstand the true specific rela- tion many of the Cynipidae bear to each other until they have been properly studied in their dimorphic forms, and this can only be done by careful breeding, and this only by confining the uni-sexual flies to growing twigs in fine muslin bags. We note what you say about these galls always being con- fined to )'oung, thrifty trees.
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