Proceedings of the United States National Museum, 1917, Vol. 52 (Classic Reprint)

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Excerpt from Proceedings of the United States National Museum, 1917, Vol. 52The head is vertical, large, and freely movable upon the pro thorax. The compound eyes are large, arched, more or less oval in outline, and naked in all species herein described. Their borders are entire, neither incised nor emarginate. The mouth parts con sist of a prominent labrum, a pair of well-developed, pointed man dibles, and a proboscis composed of the highly specialized maxillae and labium. The clypeus is prominent and well defined and varies somewhat in general outline among the genera. The frons from its union with the clypeus, which is marked by an evident suture, extends upward between the compound eyes and joins the vertex, there being no evident dividing line between the two. The antennae are inserted on the frons and are made up Of 13 segments in the males and of 12 in the females. The first segment is known as the scape, the remaining segments form the ¿agellum. The second segment Of the antenna, that is, the first segment Of the ¿agellum is fre quently called the pedicel, a term not used in my descriptions. The ocelli are not developed in this tribe of hymenoptera and their positions are marked by cicatrices. The anterior cicatrix is found upon the frons while the posterior pair is placed upon the vertex. The occiput is the dorsal part Of the head posterior to the eyes and in these wasps is ill defined or wanting, the surface of the head posterior to the eyes being vertical and ¿at or concave. The temple is that part Of the head behind the compound eye visible when the head is viewed from the side.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.