THE MALE GENITAL ARMATURE 



181 



A general study of the anatomy and homologies of the male genital 

 armature, from a developmental point of view, together with a com- 

 parison of them with the corresponding female organs, is still 

 needed. 



Velum penis. --In the locusts (Acrydiidae) the penis is concealed 

 by a convex plate, flap, or hood, free anteriorly and attached pos- 

 teriorly and on the sides to the ridge forming the upper edge of 



the tenth sternite. When about to 

 unite sexually, the tip of the abdo- 



FIG. 203 End of abdomen situated 

 under the anal lobes of Ili/dro/ih Him /,irrnx, 

 drawn out. M-CII from the ventral side: (i, 

 sternal region of 6th segment; 7, 8, 9, seg- 

 ments telescoped, when retracted, in fith 

 sesrment ; sir, membrane connecting fith and 

 7th seirment!- : (?, intromittent apparatus ; 

 rt. external lobes ; rlu, inner lobes ; pn, 

 penis. 



FIG. 204. The same 

 as in Fig. '203, seen from 

 the side : 6, the free fith 

 segment; 7-10, the four 

 last, when at rest, re- 

 tracted and telescoped 

 within the fith segment, 

 with the copula tory appa- 

 ratus (g) ; vl, outer, rlu, 

 inner lobe ; 10*. termite of 

 loth segment; 111/, stern- 

 ite of the same ; an, anal 

 opening. 



Fig. 205. Terminal 

 parts of the male copula- 

 tory apparatus of Uy/lro- 

 philitx ]'c?ux, torn apart: 

 I'lu, the two inner lobes; 

 jni. penis ; ,r, membrane 

 torn from under side of 

 penis ; fj, ejaculatory duct ; 

 ox. UN opening on the under 

 side of the- penis, directly 

 under its tip. The muscles, 

 tracheie, aud nerves are not 

 drawn. 



men is depressed, the hood is drawn backward, uncovering the 

 ehitinous penis. 



The suranal plate. This is a triangular, often thick, solid plate 

 or area, the remnant of the tergum of the last, usually, tenth, seg- 

 ment of the abdomen, the supra-anal or suranal plate, or anal oper- 

 culiim (lamina stipraanaU-s) of Haase. In most lepidopteroiis larvse 

 this plate is well marked; in those of the Platypteridae it is remark- 

 ably elongated, forming an approach to a flagellum-like terrifying 



