THE CANADIAN ENTOMOLOGIST. 123 



the quantity of sap which each obtains, said quantity being measured by 

 the nature of the shoot, whether succulent or otherwise, the only rational 

 conclusion that can be drawn is to consider the sterile form as male. The 

 correct course to have adopted would have been a dissection of the 

 animal, and a comparison of the organs of reproduction, but in this I was 

 debarred by the want of suitable instruments for the purpose. 



From what has been written upon European species, combined with 

 the facts developed in this paper, it seems safe to conclude that the Aphidae 

 reproduce both in a sexual and asexual manner. If not sexually, then 

 there is no getting rid of the conclusion that in the spring of the year 

 three forms of females are produced, wingless virgin, winged virgin, and 

 winged sterile females. As a further confirmation of the above facts, let 

 me add that similar experiments were performed upon a small drab-colored 

 species, which was found feeding upon the leaves and succulent shoots of 

 Spiraea corymbosa, with similar results. 



NOTES OX RHYNXOPHORUS ZIMMERMANII, Sch. 



BY S. V. SUMMERS, NEW ORLEANS, LA. 



Larvae, long, 1.07 to 1.40 inch. Head rather large, smooth, vertical ; 

 occiput dark chestnut brown ; medial line abbreviated, but well denned ; 

 lateral lines complete ; vertex piceous, sculptured ; front rufo-piceous ; 

 mandibles obtuse, opaque, with three large deep impressed punctures ; 

 labium 3-dentate ; mentum sinuated, sub-ilavous. Body sub-cylindrical, 

 not curved, sub-flavous, middle segments largest, humeral and anal seg- 

 ments corneous, brownish : legs replaced by six tubercles. 



Described from seven living matured larvae. 



Pupae, long, 1.10 to 1.24 inch. Quite characteristic of imago, tawny 

 yellow j prothorax and metasternum piceous ; rostrum bent close on pro- 

 sternum, and reaching anterior margin of metasternum ; elytra enclosing 

 posterior legs. Three specimens. 



R. Zimmcrmanii. Long (exclusive of rostrum), 0.66 to 1.20 inch. 

 Black, shining, rostrum shorter than thorax ; $ nearly arcuate before 

 antennae, smooth, with rather large punctures  °_ not arcuate, tuber- 

 culate; antennae with outer half of first joint rufous: eyes large, finely 



