180 



Explanation of Plates. 



Plate LVIII. Shows two preparation of A. thetis in which an 

 effort was made to preserve the parts in the 

 natural positions when in cop. with small suc- 

 cess. To diminish manipulations and undue 

 softening of parts by maceration, the scales were 

 not removed or bleached. This much obscures 

 appearances, and even so Fig. 2 shows that 

 the parts have been twisted in handling, the 

 dorsal side of one sex being in line with the 

 ventral of the other. In both preparations the 

 conjunction of the specimens is, however, still 

 probably intact, though the dark scales prevent 

 this being seen. In neither specimen does the 

 prop (hypostema) appear to be fully extended. 

 In Fig. 2 the rein is seen to include sundry 

 tracheae. In Fig. 1 it is enclosed in the ad- 

 ventitious coating illustrated on PI. LXI. 



Plate LIX. Fig. 1. A. thetis, shows the rein still extended 

 towards the aedeagus, but withdrawn 

 from it. 

 Fig. 2. A. thetis, similar result to Fig. 1. 



Plate LX. Fig. I. A. coridon, x 20. 



Fig. 2. A. thetis, X 14'5. These separated in pre- 

 paration and are placed as seen quite 

 arbitrarily ; both, however, show the ex- 

 tension of the eversible membrane of the 

 aedeagus, as it is rare to find it in ordinary 

 preparations. 



Plate LXI. All figures, A. coridon. Figs. 1 and 2 as in PI. LX. 

 Fig. 3 shows a remarkable coat, found after pairing, 

 surrounding the rein. Here it has slipped off in 

 preparing specimen. It is by no means always 

 found, why I don't know, in the following. 



Plate LXII. Fig. 2 shows it as found in situ, in a specimen of 

 A. coridon taken in cop., and Fig. 1 in a 

 specimen of P. eversmanni out of the 

 cabinet, so that it is not always got rid of 

 at once. 



August 16, 1916 



