GS8 Dr. T. A. Chapman on Asymmetry in 



the terminal spine starting dorsally, and curving round its 

 dor?al mnrgin to the left side. 



Macroglossa hcngalcnsis has a thick xdccagus witli the 

 right margin swollen and armed with spines. This species 

 has two definite spines to harpc (like some Sphinges). 



B.hojialo'psyehe nyrtcris has a very tliick /pdomgns, with 

 chitinons slips included, it has a thickened margin dorsally 

 and to the right, ending on the left in a hook following 

 the margin of the tern)inal opening, with its sharp apex 

 below the left margin, the distal margin of this hook or 

 spine is armed by a row of sharp points. 



In Ptcroyon j^voscrpina the parts seem to be quite 

 symmetrical except that the .vda'ayus, which is a chitinous 

 tube, exposed for about 1 m.m. of its length, and about 

 "25 m.m. its diameter, is slightly expanded terminally, and 

 appears to be longer on the left side, and to have a slightly 

 projecting flanged margin at this side of the extremity. 

 This flange is in fact a Hange for about half its length, but 

 its lower extremity is free, and terminates in a fine point. 

 This free extremity, however, has the same curve as the 

 portion attached to the margin of the tube, and is close 

 to the portion of the margin of the tube to which it 

 corresponds. The other extremity curving round the 

 dorsal margin, curves in a ba.sal direction, and so fades 

 away on the right side of the tube. 



Unyo liigulris. — The ivdmagus is a rather long tube, 

 with delicate transparent walls, and has a spine of stronger, 

 darker tissue, in line with it projecting from left aspect of 

 dorsum beyond left side of opening (like a bayonet on a 

 gun-barrel). The length of this fine spine is nearly 1 m.m. 

 There is no other appreciable asymmetry. 



Dcidamia inscriptu. — The only lateral inequality is in the 

 <Tdoeagus, which is about 3 m.m. long and "55 thick, at the 

 extremity, a thick hook arises on the left side, and curves 

 round the upper margin of the terminal opening, almost 

 indeed partially over it, and terminates in a fine point on 

 the right side. Comparing this with B. triopus, one queries 

 whether a half rotation of the organ has not been made in 

 one or other specimen in preparation. I describe what is 

 before me ; another preparation must be made. 



Pk. linecda. — The /vdoxigtis here is wide and short. 

 The appearances might be produced, if first the tube were 

 perfectly cylintlrical, with a terminal opening continued 

 ventrally by a longitudinal slit, then let the two sides of 



