NO. 2173. A REVISION OF THE B EM BIG IN E WA 8PS— PARKER. 3 



Mr. Charles Schaeffer, Brooklyn Institute; Mr. F. X. Williams, 

 University of Kansas; Dr. F. E. Lutz, American Museum of Natural 

 History; and Mr. W. T. Davis, Staten Island, New York. 



ANATOMY. 



Inasmuch as this work is primarily concerned with a taxonomic 

 revision of the genera and species included, anatomy need be con- 

 sidered only in so far as it has to do with the generic and specific 

 characters used in classification. With this consideration ui mind 

 a brief discussion is given below of the anatomy of the Bembicine 

 wasp, such as is deemed sufficient to enable the reader, who is pre- 

 sumed to be f amilar with entomological literature, to understand and 

 use intelligently the terms employed in the generic and specific 

 descriptions. 



Tlie head is vertical, large, and freely movable upon the pro- 

 thorax. The compomid ejes are large, arched, more or less oval 

 in outline, and naked in all species herein described. Tlieir 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 higldy specialized maxOlae 

 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 compomid eyes and joins the vertex, 

 there bemg 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 flagellum. The second segment 

 of the antemia, that is, the first segment of the flagellum is fre- 

 quently called the pedicel, a term not used in my descriptions. The 

 oceUi are not developed in this tribe of hymenoptera and their 

 positions are marked by cicatrices. The anterior cicatrix is foimd 

 upon the frons while the posterior pair is placed upon the vertex. 

 Tlie occiput is the dorsal part of the head posterior to the eyes and in 

 these wasps is iU defined or wanting, the surface of the head posterior 

 to the eyes being vertical and flat or concave. Tlie temple is that 

 part of the head behind the compound eye visible when the head is 

 viewed from the side. 



The pro thorax is relatively small; its posterior dorsal border is 

 frequently referred to as the collar and there is a rounded posterior 

 prolongation on either side near the base of the wings to which the 

 term tubercle is applied. The dorsum of the mesothorax is com- 

 posed of two sclerites of which the anterior is called in my descrip- 

 tions the scutum, which is equivalent to the tenn dorsidum of other 

 writers. The posterior sclerite is the scuteUum. The dorsum of 



