344 



PSrCHE. 



[May 1S90. 



comparatively, agrees with the present 

 species so far as the sheath is concerned. 



Fig. I. 

 Toward the tip the sheath becomes 

 narrower and more closely infolded un- 

 til just below the labellae a chitinous, 

 curved, cross piece imites the tw^o sides 

 and makes the tube complete. Chiti- 

 nous rods, quite heavy at their point of 

 inception at thiscross piece run upward 

 close to the margin of the incurved 

 edges, gradually losing themselves in 

 the body of the sheath. S. calcitrans 

 has a very similar structure. The ex- 

 treme tip is somewhat tumid, smooth, 

 set with a few tactile hairs and furnished 

 toward the back with a series of fleshy 

 processes which are apparently sucker 

 discs, being hollow with an oval open- 

 ing at the side near the tip. Centrally 

 there is an elongate, somewhat tri- 

 gonate opening, with corneous edges 

 through which the hypopharynx (lan- 

 cet) and perhaps the canula (lancet 

 sheath) are extended when the insect 

 pierces its prey ; the soft lips with the 



fleshy suckers form a close union with 

 the punctured surface. 



.v. calcitra?is diflers very decidedly in 

 the structure of the tip, the lips not be- 

 ing tumid while the edge is completely 

 encircled by the sucker discs. 



The canula or axis piece or lancet 

 sheath, carries the hypopharynx or true 

 lancet. It is rather more than half a 

 cylinder to near the tip, where there is 

 a beautiful adaptation to hold and stiffen 

 the lancet. The open sides of the canula 



Fig. 



are for a short distance almost contigu- 

 ous then again widely open, showing a 

 transverse septum rising to half the 



