28 PROC. ENT. SOC. WASH., VOL. 21, NO. 2, FEB., 1919 



Table of Subgenera of Gymnaetron. 

 (after Reitter) 



1 . Third elytral striae united apically with the eighth .... GYMNAETRON. 



Third elytral striae united apically with the sixth, the seventh and 



eighth being united RHINUSA. 



Subgenus Gymnaetron Schonherr. 



Type beccabungae Linnaeus. 



The typical subgenus does not occur in the United States. 

 Many species of Gymnaetron have a squamose area on the pleural 

 regions of thorax and this area is absent from Rhinusa. 



Subgenus Rhinusa Stephens. 

 Rhinusa Stephens, 1829, Syst. Cat. Brit. Ins., p. 150. 



Type antirrhini Paykull, designated by Westwood, 1840. 

 Table of North American Species of Rhinusa. 



1. Scutellum elongate; thorax but little broader than long; anterior 



femora armed with minute denticles; beak shorter than prothorax; 

 elytra longer than broad ANTIRRHINI Paykull. 



2. Scutellum broad, rounded; thorax very broad, transverse; anterior 



femora of male with very strong tooth; beak as long as prothorax; 

 elytra about as broad as long TETER Fabricius. 



a . Large specimens with pubescence thick on thorax and elytra, 



intervals with several rows of setae ; no red markings 



var. TETER Fabricius. 



b . With red spots on apical portion of elytra 



var. PLAGIELLUM Gyllenhal. 



c . Small specimens with thinner pubescence ; some intervals with 



but a single row of setae; no red markings 



var. SUBROTUNDATUM Reitter 



The beak of the male is more punctate and rougher than that of 

 the female in this genus. Both of the species here determined have 

 been compared with European specimens and also with the de- 

 scriptions. 



Gymnaetron (Rhinusa) antirrhini Paykull (1800). 



Curculio antirrhini Paykull, 1X00, Fauna Suec., vol. 3, p. 257, 



no. 78. 

 Curculio noctis auct., Brisout not Herbst (1795). 



This is a European species recorded as breeding in seed pods 

 of Linaria genistaefolia and L. vulgar is. The name antirrhini 

 is confused with the variety subrotundatum Reitter cited below. 

 The material at hand answers the description and tallies with 

 the three European specimens determined as noctis. Three 



