On new 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 infbrmata, a Miocene 

 species described by Lonsdale in the first volume of the 

 1 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 C. pumicosa, 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, 5. 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 Frederick 

 Smith, Assistant in the Zoological Department, British 

 Museum. 



[Continued from p. 55.] 



Family Crabronidze. 

 Genus Trypoxylon, Latr. 



Trypoxylon vagum. r 



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 antennse and in the sinus of the eyes 

 has a golden lustre; the cheeks silvery; the mandibles and 

 the apex of the scape ferruginous. Thorax : the anterio 



7* 



