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Fig. 202.—Male organs of generation of Athalia.—After Newport.

Notice should also be taken of the paired uncinate hooks which are modifications of the penis-sheath of the male of cockroaches (Phyllodromia), which Haase states appear to originate on the tenth ventral plate, and which probably “serve to open and dilate the vagina of the female, especially as a perforated penis, which is highly developed in Machilis, seems to be wanting in the Blattidæ.” (Haase.)

The penis.

An examination of Figs. 203–207 will aid in understanding the various modifications in beetles, etc., of this organ.

A general study of the anatomy and homologies of the male genital armature, from a developmental point of view, together with a comparison of them with the corresponding female organs, is still needed.

Fig. 203.—End of abdomen situated under the anal lobes of Hydrophilus piceus, drawn out, seen from the ventral side: 6, sternal region of 6th segment; 7, 8, 9, segments telescoped, when retracted, in 6th segment; zw, membrane connecting 6th and 7th segments; G, intromittent apparatus; vl, external lobes; vlu, inner lobes; pn, penis.