OF THE HOTHOUSES, ROYAL BOTANIC GARDEN. IOI 
Besides these we have a dead pupa, found by Mr. 
Stewart in a propagating-frame on June 13, 1904, but not 
yet identified. 
Two species of fresh-water shells—a Lizmnga and a Physa— 
live in the water-tubs in the hotter part of the Palm-house. The 
Limnea remains still undetermined, but the Pysa is apparently 
Ph. acuta. 
ANTS. 
In the other branch to which we have devoted special attention 
—the ants—we have detected six species. 
Tetramorium guineense, Fabr.—By far the most abun- 
dant is the species which led us to these investigations, and 
which has been identified for us by Mr. Edward Saunders as 
Letramorium guineense, Fabr. It is almost universally distri- 
buted through the houses, running actively about the wooden 
platforms and over the plants. This species sometimes attends 
on the scale-insects, “ milking its cows,” according to the popular 
phraseology. It makes its nests in the corner of the frames, and 
forms occasionally as the approach to its nest an ingenious 
earth tunnel along the angle formed by two sides of the frame. 
Winged specimens are about by June 9, and may be met with 
till the end of September. On September 28, 1904, I observed 
a number of workers tugging viciously at the wings and head of 
winged females, as if they would tear the creatures in pieces. 
On being disturbed, both workers and females ran off, but ere 
long the fernhales were again helpless in the workers’ hands. 
I took this as the sign of the settling of a new nest. 
Technomyrmex albipes, Smith, var. brunneipes, Forel.— 
The second species to which we were introduced is a black 
ant, of even more active habits than the last, but much more 
restricted in its distribution than that species. By preference it 
haunts plants infested by scale-insects, over which insects it 
builds chambers of earth to protect them and to keep them 
prisoners. Mr. Stewart, who introduced us to this ant in June 
1904, opened several such chambers in our presence and 
