On neio Species of Fossorial Hymenoptera. 99 The mouths of the cells are generally placed so as to come between two other cells, and they are so pressed down as to be discovered with difficulty ; and it frequently happens that no mouth can be discovered over the whole upper surface, but one or two may be found on the edge of the mass. The arrangement of the cells, if arrangement it can be called, reminds me more of Cellepora informata^ a Miocene species described by Lonsdale in the first volume of the * Quarterly Journal of the Geological Society,' p. 506. The form of the cells, and their heaping together and being fora-minated, gives a certain resemblance to them ; but in the fossil rather regular layers of cells can be traced, similar to those in old specimens of G. pwnicosa, while in the recent species we have in view they are so minute that I cannot satisfy myself on this point. Large masses of Sertularia were cast ashore last autumn and winter on the beach at Exmouth. I collected a good many of them, and on some I discovered this species ; they are principally on the lower branches of the Sertularian. I shall send specimens to the British Museum. EXPLANATION OF PLATE III. B. figs. 1-6. Fig. 1. Groups of cells, natural size. Fig. 2. Enlarged. Fig. 3. Removed from the Sertularian. Figs. 4, o. Front and lateral views of cells. Fig. 6. The beginning of a group with four cells, mouthless, or opening into a common elongated cell. XIV. — Descriptions of new Species of Fossorial Hymenoptera in the Collection of the British Museum. By Fredeeick Smith, Assistant in the Zoological Department, British Museum. [Continued from p. 55.] Family CrabronidaB. Genus Trypoxyjlon, Latr. Trypoxylon vagnm. Female. Length 5\ lines. Black, adorned with golden pubescence ; abdomen pale testaceous at the base. Head opaque ; the face and clypeus with silvery pubescence, that above the insertion of the antennas and in the sinus of the eyes has a golden lustre ; the cheeks silvery; the mandibles and the apex of the scape fermginous. Thorax: the anterio 7*
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