2iO DISEASES OF INSECTS. 
Dr. Matthey asks — How does the Gordhts get into 
Acrida viridissima a ? And De Geer — Why do they die 
after having quitted a caterpillar? and where do they 
perpetuate their species b ? These questions, without 
further observations, cannot easily be answered. How- 
ever, it may be supposed that carnivorous insects, such as 
Harpali, &c. may swallow them when found apparently 
dead in clay, where the water has been evaporated, or 
when they have been ejected by other insects ; and they 
may revive in their bodies, as Dr. Matthey found them 
to do in water. It is not difficult to conjecture that the 
larvae of Phryganece may meet with them when young in 
the water, and sometimes unluckily swallow them with 
their food. Why they become as dead when they emerge 
from their prey we cannot at present conjecture ; but no 
doubt to answer some wise purpose ; — in rainy seasons 
they probably revive and get into little hollows full of 
rain-water. Upon De Geer's last question — How they 
perpetuate their species — at present I can offer no con- 
jecture. 
I am, &c. 
n Ubi supra. b De Gecr i. 553. 
