Читать книгу The Structure and Life-history of the Cockroach (Periplaneta orientalis) - L. C. Miall - Страница 21

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Male Cockroaches are readily distinguished from the females by the well-developed wings and wing-covers. They are also slighter and weaker than the females; their terga and sterna are not so much thickened; their alimentary canal is more slender, and they feed less greedily (the crop of the male is usually only half-full of food). They stand higher on their legs than the females, whose abdomen trails on the ground. The external anatomical differences of the sexes may be tabulated thus:—

Female.	Male.
Antenna shorter than the body, the third joint longer than the second.	Antenna rather longer than the body, the third joint about as long as the second.
Wings and wing-covers ru­di­men­tary.	Wings and wing-covers well de­vel­oped.
Mesosternum divided.	Mesosternum entire.
Abdomen broader.	Abdomen narrower.
Terga 8 and 9 not ex­ter­nal­ly vis­ible.	Terga 8 and 9 externally vis­ible.
The 10th tergum notched.	The 10th ter­gum hardly notched.
The 7th sternum divided behind.	The 7th sternum un­div­ided.
The external outlet of the rectum and vulva be­tween the 10th ter­gum and the 7th ster­num.	The outlet between the 10th ter­gum and the 9th ster­num.
No sub-anal styles.	Sub-anal styles.