64 THE CANADIAN ENTOMOLOGIST. 



this, forming a central row, are eight spots, light in the centre with dark 

 borders, becoming entirely dark with more superficial focussing ; appar. 

 ently these lie immediately above the channel formed by the epi- and 

 hypo-pharynx leading 'to the gullet. 



In Cicada the epi-pharynx, which forms the under surface of the 

 clypeus, is channelled, and the edges of channel are raised into two strong 

 arches. In the central portion of this channel is a double row of ten 

 spots similar to those described in P. tesselata, and back of these in a 

 direct line toward the pharynx is a sac-like organ apparently with an open- 

 ing into the channel and with a delicate tube leading from its neck, and 

 within its boundaries two clusters containing four spots each, lying one on 

 each side of the median line.* These spots are very similar to structures 

 that I have examined which are similarly located in the honey ant, and 

 which evidently correspond with the sense organs of the honey bee 

 described as located here. 



These organs, which seem never to have been described in Hemiptera 

 heretofore, are present in such Hemiptera as I have been able to examine, 

 and when fresh specimens are at hand, it is hoped that their structure and 

 ofhce may be more fully determined. It seems most probable, however, 

 that they are organs of sense, and their location would warrant the belief 

 that they may be connected with taste, though they may be connected 

 with smell instead, or it is not impossible, owing to the close relation of 

 these senses even in the highest animals, that they might perform a double 

 office. The wax-secreting glands located on the dorsal surface of each 

 segment consist of circular groups of large pavement cells disposed 

 beneath the epidermis. 



Prof Thomas, in his work on Aphididae (8th Rept. State Entomolo- 

 gist of 111.), places this species in the genus Schizoneiira, but following the 

 venation of the wings according to which the genera are divided, it can- 

 not be placed in this genus since the third discoidal vein is not forked, 

 while in other characters, as well as this, it agrees with Pemphigus. 



The venation, however, is not constant, for in examining the wings of 

 over thirty specimens, one was found in which the third discoidal of the 

 front wing was distinctly forked, while in one other the second oblique of 

 the hind wing was forked. 



* Can this structure l)e analogous to the "taste goblets" which are found in the 

 fungiform and circumvallate papilloe of the human tongue ? 



