of the Ilymenojjteroiis genera Cleptes, ^-c. 463 



at the sides of the thorax the punctures are more or less 

 confluent. Abdomen: the first segment strongly punc- 

 tured, the punctures not very close except at the sides of 

 the segment ; the second and third segments less strongly 

 punctured, and having a central, smooth, longitudinal line; 

 the apical margin of the third segment with seven teeth, 

 the central one smallest. AVings hyaline, the nervures 

 fuscous. 



The male exactly resembles the female. 



Both sexes have seven teeth. 



Hab, — Perth, Western Australia. 



Genus Pyria, St. Farg. 



This genus is composed of species that form a section 

 of the Chrysididcz intermediate betAveen the genus Stllbum 

 and that of Chrysis. Its claims to generic distinction 

 ajipear to be based on a difference in the relative length 

 of the joints of the antenna?, and in the post-scutellum 

 being produced into a conical pointed tubercle, which 

 projects over the base of the abdomen ; the neuration 

 of the wings in the genera Pyria and Chrysis being 

 essentially the same ; Sfilbum, however, appears to have 

 a permanent difference in the marginal cell, it being, in 

 the extensive series of examples that I have examined, 

 oj)en at its apex ; in the genera Pyria and Chrysis it is 

 closed. That an occasional exception to this circumstance 

 Avill be found is certain, but that is only what is to be 

 expected in so extensive a genus as Chrysis; I have 

 observed exceptions to the rule in some of the beautiful 

 species from Brazil. 



The number of joints of which the antennfe of the 

 species belonging to the genera Stilbum, Pyria and 

 Chrysis is composed is thirteen, that number being found 

 in both sexes of the species. The third joint of the 

 antenna?, in the genus Stilbum, is the longest, as it is also 

 in the genus Chrysis, but in the genus Pyria the fourth 

 is the longest. The latter genus has the post-scutelluni 

 produced in the form of a conical spine over the base of 

 the abdomen, but the cone, or tuberculate process, is not 

 hollowed out as in the genus Stilbum ; I only know of a 

 single exception to this characteristic,— it is found in Pyrm 

 smaraydula of St. Fargeau, P. stilboides of Spmola ; in 

 this species the conical spine is hollowed out above, but 

 the excavation is coarsely punctured. 



