NO. 1S66. WEW SAWFLIES IN U. S. NATIONAL MUSEUM— ROHWER. 405 



Genus TAXONUS Hartig. 



Subgenus PARASIOBLA Ashmead. 



TAXONUS (PARASIOBLA) RUFOCINCTUS VIRGINICUS, new variety. 



Differs from the typical rufocinctus (according to a proxytype in the 

 American Entomological Society collection made by Koliwer in June, 

 1909) in having the abdomen beyond the basal plates entirely rufous. 

 This variation occurs with the typical form in Virginia, but as exliib- 

 ited by many individuals from Mr. Nathan Banks' collection is 

 more abundant than the typical form. In some few specimens the 

 apical dorsal segments are slightly brownish. Males and females. 



Great Falls, Glencarlyn, and Falls Church, Virginia; Ithaca, New 

 York. Collected by N. Banks. Dixie Land, Virginia, collected by 

 C. L. Marlatt. 



Ty 2)6.— Cat. No. 13840, U.S.N.M. 



Paratype in collection of Mr. Banks. 



Genus DIMORPHOPTERYX Ashmead. 



Key to species. 



Mesoprescutum rufous; basal plates pale abnonnis Rohwer. 



Mesoprescutum black; basal plates black 1 



1. Apical foiu- abdominal segments black; (mandibles, antennse, clypeus and labrum 



black) vielanognathus Rohwer. 



Abdomen beyond basal plates pale, sheath black 2 



2. Females (scutellum yellow) 3 



Males (scutellum black) 5 



3. Antennaj black pmguis virginica Rohwer. 



Antennae pale 4 



4. Ocellar basin with well defined lateral walls which extend to the bases of antennae; 



clypeus subangulate emarginate pinguis pinguis (Norton). 



Ocellar basin with the lower lateral walls not sharply defined and reaching the 

 bases of the antennae as roimded ridges; clypeus subsquarely emarginate. 



pinguis errans Rohwer. 



5. Antennae black; ocellar basin with rounded walls; fifth to eighth joints of antennae 



beneath with an apical projection pmguis errans Rohwer. 



Antennae brown; walls of ocellar basin well defined; fifth to eighth antennal joints 

 without projection beneath pinguis virginica Rohwer. 



DIMORPHOPTERYX PINGUIS (Norton). 



The type of Norton's pinguis is not in the collection of the American 

 Entomological Society, and appears to be lost. A specimen which 

 agrees with the original description and with specimens wliich were 

 supposed to be determined by Norton is taken as the proxytype.^ 

 Dr. H. G. Dyar has bred what was considered to be this species 

 from birch, hnden, sugar plum (Amelanchier canadensis) , maple, and 



1 The word "proxytj-pe'' is used to designate a specimen chosen (and labeled as proxytype) as the type 

 by a subsequent author when the real type has been destroyed or lost. 



