PREDACIOUS AND PARASITIC ENEMIES OF APHIDES. 249 



like appearance so far as form goes. To prevent Dasya elegatis 

 dropping its hairs, and the more delicate species of Polysiphonia 

 breaking up into short pieces, they should be put, whilst fairly 

 fresh, into formalin or chrome alum solution. — Bot. Gazette. 



|pre^aciou6 S. iparaditic lEnemice of apbi^c0 



(incluDina a StuDy oX H^^per^parasites). 



By H. C. a. Vine. 

 Part IV, (continued). Plates XIII. and XIV. 



Capsus Lanarius. Anatomy of the Imago. 



THE change involved in the casting of the nymphal skin of 

 this specie^ is much greater than is the case with many 

 others of the order. The most striking feature of the 

 nymph, the numerous tufts of elongated, flattened appendages, 

 which, for want of a better name, I have called ' hairs,' have 

 wholly disappeared, and the abdomen, which has no longer the 

 distended appearance of the nymph, is become chitinous, shining, 

 glabrous, brown to black in colour, though sometimes yellowish 

 beneath, and clearly segmented ; in the female the dorsal surface 

 of the posterior segments of the abdomen is divided by two horny 

 ridges, between which an ovipositor of beautiful construction 

 (Fig. 6, PI. XIV.) is extruded as occasion requires. 



The abdomen and the major part of the thorax is now com- 

 pletely hidden by the extensive hemelytra, which, with the evolu- 

 tion of the scutellum and the development of colour, make so 

 great a change in the general appearance of the insect as to make 

 it difificult to believe that only a cast skin stands between it and 

 the nymph. 



The Head of the Imago. 

 The head has wholly lost the elongated and somewhat 

 angular appearance which was characteristic of the larva. It is 

 now broad and flat, the length at the most not exceeding the 



International Journal of Microscopy and Natural Science. 



Third Series. Vol. VI. r 



