PROC. ENT. SOC. WASH., VOL. 21, NO. 6, JUXE, 1919 149 



pr Penis rods. 



pv Penisvlavae, or penis valves which unite to form the so-called penis. 



Styli, or arthrostyli (segmented styli). 

 t Telonlum, or median terminal filament, 

 v Virga, or chitinized terminal portion of ejaculatory duct. 



EXPLANATION OF PLATES. 



The designation "ossicular surface," refers to that surface of the copula- 

 tory apparatus which bears the copulatory ossicles "gl" of all figures. The 

 designation "abossicular surface," refers to that surface of the copulatory 

 apparatus on the side opposite the ossicular surface. The designation "(prim- 

 itively) ventral," refers to that surface of the genital apparatus which was 

 originally ventrally located in the primitive sawflies, and has remained so 

 in the insect in question. The designation "(secondarily) ventral" denotes 

 that surface of the copulatory apparatus which was originally dorsal in the 

 primitive sawflies, but, in the insect in question, has come to occupy a ventral 

 position through a revolution of the copulatory apparatus on its long axis, 

 through 1 80 degrees. 



Mr. S. A. Rohwer has identified the specimens and has furnished most of 

 the material used in the preparation of this paper. All figures except those 

 of larvae are of male insects. 



Fig. i. Genitaliaof Cimbex americana, var. luctifera, Klug, abossicular sur- 

 face (secondarily ventral). 



Fig. 2. Genitalia of Polyselandria flavipes (Nort.), -abossicular surface 

 (secondarily), ventral. 



Fig. 3. Genitalia of Pteronidea ventralis (Say), abossicular surface (sec- 

 ondarily) ventral? 1 



Fig. 4. Genitalia of Tenthredella verticalis (Say), -abossicular surface, 

 (secondarily) ventral. 



Fig. 5. Genitalia of Hemitaxonus dubitatus (Nort.), abossicular surface 

 (secondarily) ventral. 



Fig. 6. Genitalia of Cephaleia fascipennis (Cress.), abossicular surface 

 primitively) dorsal. 



Fig. 7. Genitalia of Xiphydria mellipes (Say), abossicular surface (primi- 

 tively) dorsal. 



Fig. 8. Genitalia of Cephus cinctus (Nort.), abossicular surface (primi- 

 tively) dorsal. 



Fig. 9. Genitalia of Perga dorsalis (Leach), abossicular surface (second- 

 arily) ventral? 



Fig. 10. Genitalia of Eriocampoides amygdalina (Rohwer) (paratype), 

 abossicular surface (secondarily), ventral? 



1 The question mark following the designation of the surface of the 

 copulatory apparatus figured, indicates that the genitalia were removed from 

 the insect before it came into my hands, and the designation dorsal or ventral 

 is purely conjectural. 



