and Occurrence as British, of Lomechusa strwmosa, 417 
used in any way to grasp or hold the 9, it can be under- 
stood why they are simple in both sexes, and not modified 
in the &. 
The perfect insects appear to die off about the middle of 
June. I took my first specimen this year on April 27th ; 
I exhibited it at the Royal Society on May 8th, and it 
died on May 30th. I was able to account for all the 
beetles in my observation nest, as they either came out of 
the nest to die, or were brought out by the ants; the last 
died on June 21st. 
On September 8th I noticed two new Lomechusas out, 
and have since counted seven specimens altogether ; these 
must have hatched from pupe, or full-grown larvee, already 
in the nest. Of course my study is much warmer than 
out of doors, and in nature these specimens would hibernate 
with the ants in their winter quarters by the end of 
September. 
T introduced specimens of Formica rufa, fusca, and exsecta, 
Lasius fuliginosus, and Formica sanguinea from different 
nests at different times into the plaster nests with Zome- 
chusa, as all my experiments * have shown that true ants’- 
nest dwellers are protected from the ants even of another 
%. 
Fie. 2. Glands of Lomechusa. N.B.—The position of the glands is 
disturbed through dissection. 
» 3 Labium. 
, 4. Dorsal segment of Abdomen. 
species, and | found that, though attacked ai first, the 
beetles were able to protect themselves. They shook 
themselves, stamping with the feet and putting up their 
* Cf. Ent. Record, 1901, pp. 349-353; 1908, pp. 11-12; 1906, 
p. 288, and 1907, p. 256. 
