THE CANADIAN ENTOMOLOGIST. 63 



crust, and at one side of this a cavity containing a papilla ; the surface of 

 the joint is broken below this in two places by irregular interruptions in 

 the crust, which appear to be lined by more delicate membrane. It is 

 also somewhat roughened and thrown up in places in transverse ridges or 

 elevations ; a few hairs also pass from round openings in the crust. The 

 subterminal joint has very near the end a large opening through the 

 external coat, and within this three large glandular bodies which bear 

 papillae. Other open spaces are to be seen along the joint, but no glands. 

 The fourth and third joints have also irregular transverse interruptions in 

 the crust, but no papilla-bearing glands. 



The papilla-bearing bodies in the last two joints must certainly be 

 organs of sense, though I have not been able to satisfactorily show their 

 connection with nerves. A delicate thread, probably a nerve, can in some 

 cases be seen running through the joints, but preparations from fresh 

 specimens will be necessary to establish its character and connections. 

 The delicate membranous coverings of the transverse irrorations in the 

 crust seem also well adapted to receiving impressions, but their connection 

 with nerves is still undetermined. 



The labrum is a slender conical projection beyond the clypeus from 

 vv'hich its separation is indistinctly marked, since it contains but little 

 chitinous structure. It is channelled on the under side to near the tip, 

 and from this channel the setse forming the sucking tube pass in a regular 

 curve into the channel of the labium. 



The superior setae (mandibul^) spring from cones which originate 

 with chitinous arcs each side of the opening of the oesophagus ; passing 

 forward, they unite immediately in front of the hypopharynx and within 

 the paraglossK. The inferior setae (maxilte) arise from similar cones 

 which lie beneath based upon chitinous structure lying at the superior 

 posterior portion of paraglossal bases. They unite with each other and 

 with the superior setae at the union of the latter, and pass with these 

 between and in the channel of the paraglossse, and thence into the groove 

 of the labrum. The paraglossae are short and setaceous, arising from an 

 inferior lamina which rests upon the base of the labium. The labium is 

 4-jomted and reaches nearly to the end of the body in the larva, but only 

 beyond the first pair of legs in the adult ; the tip is surrounded by numer. 

 ous hairs and a row of bristles extends each side of the groove. Imme- 

 diately in front of the oesophageal opening appears a denser portion, the 

 epi- and hypo-pharynx, extending to the union of the setae, and within 



