a“ * 
~ 
172 NATURAL HISTORY OF WASPS. 
work * for a fuller and more comprehensive account 
of this system, both anatomical and physiological, 
than I could find room for here. But, without enter- 
ing into all the details, which belong to entomology 
generally rather than to our present subject, it will 
be necessary, to the full understanding of the natural 
history of wasps, to give more than a cursory sketch 
of these organs; the female, so important in a phy- 
siological point of view; the male supplying the 
most unfailing anatomical distinctions between diffe- 
rent species. 
It will facilitate our examination to bear in mind 
that there is a certain correspondence between the 
several organs in the two sexes respectively. Not 
that each organ has its exact counterpart in the 
other sex, but that the chief organs are evidently 
framed on a type common to them both. This com- — 
munity of type displays itself in the form and 
elementary structure of various parts whose functions 
may be very dissimilar. The clue fails us when we 
deal with parts which have no essential character by 
which we may discover them under another form. 
But where any such characters are present the mor- 
phological identity of these parts may be certainly 
proved. And the analysis, though it has been less 
studied, has no greater difficulties than, and is as 
full of interest to the anatomist as, that of the 
thorax. 
The male organs of the wasp, as of other insects, 
consist of two symmetrical secreting glands, the 
testes, and an intromittent organ. It is in the 
* “Entomology, translated,’ pp. 181—223. 
