24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



evergreen tree, Picea englemanni. Thomson 's species Jiyalinata, com- 

 pressicornus , and angustula,^ seem to belon": to the genus Platygaster 

 but is hard to sa}' definitely since some species of Leptacis are without 

 a spine on the scutellum. The character of real importance, namely, 

 the presence or absence of foveae on the second tergite, is not dis- 

 cussed at all in Thomson's descriptions. 



Xestonotidea Gahan*" with foersteri Gahan as its type, is a typical 

 Platygaster species. Foerster would probabl\' have placed it in his 

 genus Polygnotus, although the sculpture is delicate. The median 

 lobe of the mesonotum is truncated and touching the scutellum, but 

 the lateral lobes do not touch the upper part of the scutellum, a wide 

 space being left between the two parts. The scutellum is not quite 

 typical of Xestonotus Foerster being rather densely pubescent later- 

 ally. 



This mistake in identification is of no moment, however, for I have 

 specimens showing transition between the wide scutellar suture of 

 Platygaster and the narrow one of Xestonotus Foerster. As with 

 Ancuron, discussed above, the difference is one of degree and is of 

 little or no generic value. Anopedias error Fitch may be taken as 

 showing the typical form of Xestonotus, with its narrow scutellar 

 suture and parallel, widely separated notauli. 



Isorhomhus Jiyalinipennis Ashmead, which seems to form the basis 

 of Ashmead 's conception of the genus Isorhomhus, really belongs to 

 Platygaster and forms a division of its own characterized by a sharp 

 differentiation in the color of the funicle and club. Ashmead was in 

 error when he said the antennal clubs of the types were three-jointed. 

 They are reall}' four-jointed (with the first joint only slightly wider 

 than the last funiclar joint) although a three-jointed appearance is 

 caused by the differentiation in color of terminal three joints. Other 

 points of interest in connection with the t^^pes are: First, the lateral 

 ocelli are less than their diameter distant from the margin of the 

 eye; and, second, the scutellum has the dorsal plate slightly upturned 

 apically. The sculpture of the specimens as a whole is moderately 

 fine, the scutellum and the greater part of the body being faintly 

 shagreened. 



The subgenus Triplatygaster Kieffer" with contorticornis Ratzeburg 

 as its type, has not been recognized in America. The group is 

 characterized by having the mesonotum very long and indistinctly 

 longitudinally striate, the notauli complete, and the eyes pubescerit. 



This synonony necessitates a restatement of the generic diagnosis 

 given in my paper referred to above: 



• Ofvers. af K. Vet.-Akad. ^orh., 1859, p. 82. 



>« Proc. U. S. Nat. Mus., vol. 56. p. 524 



"Broteria: Serie Zoologica, vol. 11, fasc. 3, 1913, p. 178. 



