140 Prof. J. Wood-Mason on a Viviparous Caddis-fly. 
the insect began to feel the effects of the alcohol there issued 
from the extremity of its abdomen in a dense cloud innumerable 
tiny living creatures, which wriggled convulsively in the fluid 
for some seconds before they died. These tiny creatures, on 
examination under the microscope, proved to be Trichopterous 
larvas possessing all the characters, namely the slender and 
tapering body, the laterally-expanded and dorsally-humped 
first abdominal segment, but above all the disproportionately 
long and slender third pair of legs, of those of typical Lepto- 
ceridae. They closely resemble the larva that forms the sub- 
ject of De Geer’s pi. xv. fig. 10 (Hist, des Ins. t. ii. pt. i.), 
which undoubtedly represents the larva of a species of the 
same family. They measure about *75 millim. in length and 
about T25 in breadth ; they number no less than 460, 
according to my native artist, who measured and counted 
them for me. As is often, if not invariably, the case with 
Trichopterous larvae of the first stage, no tracheal gills are 
present, at least none are to be detected. 
No trace of the gelatinous secretion by which the eggs of 
the oviparous forms are bound together in masses was detect- 
able either in the body of the mother or amongst the extruded 
brood. 
The abdomen of the female still retains the distended con- 
dition it had before parturition, and presents itself as a thin 
and transparent membranous sac, the walls of which bear 
both on the dorsal and on the ventral side a longitudinal 
series of exceedingly short, transverse, brown bands, repre- 
senting the more firmly chitinized terga and sterna of its con- 
stituent segments. The four penultimate of these segments 
appear to be extended and stretched, both in the longitudinal 
and in the transverse direction, to the limit of the extensibility 
of all their interarticular membranes, being separated from 
one another both above and below and at the sides by long 
and equal membranous intervals, while the four basal are 
stretched to little more than half the extent of their mem- 
branes in any part ; so that the posterior half of the abdomen 
would seem to be that which gives lodgment to the main 
mass of the brood-pouch. The abdomen is in fact expanded 
for the accommodation of the developing brood much more 
after the fashion of that of the white-ant queen for her eggs 
than of those of the viviparous Coleoptera of the genera 
Spirachtha and Corotoca described by Schiodte. 
The mother insect, which is of a dull golden-brown colour, 
has the antennas equal to the anterior wings in length and is 
furnished with a retinaculum; it agrees in all essential particulars 
with McLachlan’s diagnosis of the genus Notanatolica , to 
