198 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



From the pair secured by Mr. Greene the position assumed by 

 certain parts of the genitalia may be described as follows: The 

 hypopygidium fits over the knob at the base of the sheath while 

 the cochlearii grasp the side of the same knob in the manner of 

 a ball and socket joint. The position of the other parts cannot 

 be seen. 



HYPARGYRICUS FUMIPENNIS (NORTON). 



Mr. J. C. Crawford captured a pair of this species in coitu. 

 on Plummer's Island, Md., April 22, 1915, and notes that they 

 were facing in the opposite directions. 



EXPLANATION OF PLATE XXII. 



Pteronidea ventralis (Say). A and B Two perfect individuals, male 

 and female, mating. C, D and E female which has lost her flagelli 

 being "courted" by three males. In D and E the female is mating with 

 the male at the left. (Photographs by H. S. Barber at Plummer's Island, 

 Md., on leaves of Salix niger). 



AMETASTEGIA GLABRATA (FALLEN), A HOLARGTIC SAWFLY. 



BY S. A ROHWER 



Branch Forest Insects, Bureau of Entomology, Washington, D. C. 



The "dock sawfly," Ametastegia glabrata (Fallen), has been 

 known in America for many years and has heretofore been con- 

 sidered as a native species. Whether it is a native holarctic 

 species or whether it was introduced from Europe may never be 

 decided, but it is very certain that the American and European 

 specimens are morphologically identical and inasmuch as they 

 have the same habits it is believed the following synonymy is 

 justifiable. The European synonymy is copied from Enslin. 



AMETASTEGIA GLABRATA (FALLEN). 



Tenthredo glabrata F&lten, Svensk. Vet.- Akad. Handl. 1808, p. 108. 

 Tenthredo (Allantus) agilis Klug, Magaz. Ges. Naturf. Fr. Berlin, VIII, 



1814, p. 208. 



mthredo (Allantus) rnfipes Lepeletier, Monog. Tenthred. 1823, p. 81. 



letastegiafulvipes A. Costa, Rend. Acad. Sc. Napoli, vol. 21, 1882, p. 198. 



oma Norton, Proc. Boston Soc. Nat. Hist., vol. 9, 1862, p. 



Tr. Amer. Ent. Soc., vol. 2, 1868, p. 165; Provancher, Nat. Can., 



. 10, 1878, p. 165; Fauna ent. Canad., Hyin. 1883, p. 214; Jack, 



