240 Prof. J. C. Schiódte on the Morphology 
therefore that afterwards, when the second volume of his 
manual was published, he did not wish to maintain his former 
statement as universally correct. 
According to my own very extensive investigations, the 
facts are the following. | 
mehota heteroptera possess, without exception, ten pairs 
of spiracles; and their distribution is exactly the same which I 
a 
ave demonstrated long ago in Eleutherata. 
observed; and the spiracle has been sought in vain because 
entomologists have sought it under the edge of this cover, 
which has been mistaken for the suture between the two seg- 
ments, instead of looking for it under the real suture. This 
latter is not to be seen before the cover is removed to a little way 
in front of the second pair of coxe, when the spiracle appears 
very clearly. It is v near its edge that the cover is close- 
fitting ; further forwards the metathorax is so much inflected 
as to leave a considerable air-reservoir between it and the 
