48 REVIEWS. 
” In the second stage, or Histriobdella-like form, the larva is, in 
its general appearance, like the low worm to which Ganin compares — 
it. It may be described as bearing a general resemblance to 
the third and fully developed larval form (Fig. 19, tg, three pairs 
of abdominal tubercles destined to form the sting ; l, rudiments of » 
the legs; fk, portion of the fatty body ; at, rudiments of the an- . 
tenn; fl, imaginal discs, or rudiments of the wings). No 
trachee are developed in the larva, nor do any exist in the 
Fig. 19. imago (Ganin thinks, that as these insects are 
somewhat aquatic, the adult insects flying over 
the surface of the water, the wings may act 
as respiratory organs, like gills.) It lives six 
to seven days before pupating, and remains 
from ten to twelve days in the pupa state. 
The development of Ophioneurus, another 
fj? and Polynema. This egg-parasite passes its 
early life in the eggs of Pieris brassice, and 
two or three live to reach the imago state, 
though about six eggs are deposited by the 
G cx 
Sey Gees, 
R, 3° 
5 4 
g 
Sue 
w The larva is at first of the førm indicated by 
Fig. 20 E, and when fully grown becomes 
of a broad oval form, the body not being 
divided into segments. It differs from the 
genera already mentioned, in remaining within 
its egg membrane, and not assuming their 
strange forms. From the non-segmented, sac-like larva, it passes 
directly into the pupa state. 
First larva of Polynema. 
` The last egg-parasite noticed by Ganin, is Teleas, whose devel- : 
opment resembles that of Platygaster. It is a parasite in the 
eggs of Gerris, the Water Boatman. Fig. 20 A represents the 
egg ; B, C, and D, the first stage of the larva, the abdomen (or pos- 
terior division of the body) being furnished with a series of bris- 
tles on each side. (B represents the ventral, C the dorsal, and D 
the profile view; at, antenne; md, hook-like mandibles; M90, 
mouth; b, bristles; m, intestine; sw, the tail; ul, under lip, oF 
labium). In the second larval stage, which is oval in form, an 
non-segmented, the primitive band is formed. 
In concluding the account of his remarkable discoveries, Ganin 
egg-parasite, agrees with that of Platygaster — | 
female. The eggs are oval, and not stalked. 
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