DISEASES OF INSECTS. 199 
tion of these affects the gueen-bee*. A similar result, 
as Huber tells us>, follows, when the same experiment is 
repeated on the workers or drones: they immediately 
‘become unable to take any further part in the labours of 
the hive; they can no longer guide themselves except in 
the light; if they petition one of their fellow citizens for 
honey, they are unable to direct their tongue to its mouth 
to receive it; they remain near the entrance of the hive, 
and when the light is intercepted they rush out of it to 
return no more. , 
Insects occasionally are subject to tumours or a preter- 
natural enlargement of their parts and organs. The an- 
tennee of bees sometimes swell at their extremity so as 
to resemble the bud of a flower ready to open, becoming 
at the same time very yellow, as does the fore part of 
the head‘. I once saw a specimen of a Hydrophilus— 
agreeing with H. fuscipes in every other respect even 
to the most minute punctum—which had a large tumour 
on each side of the prothoraz, evidently accidental, occa- 
sioned probably by the stoppage of the pores by which 
the superfluous moisture and air escape when it under- 
goes its last change. The converse of this I have ob- 
served to take place sometimes in the same part of Geo- 
trupes fovedtus, the ordinary lateral fovee becoming very 
considerably enlarged ;—thi_ was the case with the spe- 
cimen from which Mr. Marsham made his description 
of that insect. The species is, however, very distinct in 
other respects, and may always be known by its small 
size. It happens now and then also, that these tumours 
represent dlisters. I saw one once on one elytrum of a 
* Vo. Il. p. 169—. > Huber Adeies i1. 409. 
° N. Dict. d’ Hist. Nat. 1. 42. 
