120 



double row of closely packed eggs, as shown in the accompanying illus- 

 tration (Fig. 12), the cluster comprising about forty-four eggs. Ko 

 enveloping membrane again was apparent. The individual eggs were 

 considerably narrowed by lateral compression of the abdominal joints 

 toward the inner and smaller circumference of the semicircle, and all 

 of them plainly showed the segmentation of the future insect, the more 

 developed being just ready to burst from the enveloping shell. The 

 individual eggs are a trifle over 2 millimetres long, and the egg-cluster, 

 in longest diameter from tip to tip, is about 8 millimetres. The eggs 

 were not all of the same color, the more mature being darker than 

 the rest. 



These two specimens, with the additional facts obtained on the repro- 

 ductive habits of the insect, confirm the viviparity of this insect. 



In the case of the specimen collected by Mr. Gruttenberg the only 

 living young had been deposited by the female, and there is very little 

 question that some of the eggs afterwards extruded were defective 

 and would not have produced living young. All the evidence seems 

 to point to the fact that the young hatch within the abdomen of 

 the female. The shell of the egg is a very delicate 

 aftair and after the hatching of the young becomes 

 a mere shred, and in the first specimen examined no 

 trace of a case could be found after hatching. Yet 

 a more careful examination of the mass contained in 

 the second sjiecimen sent by Dr. Gissler shows that 

 there is a partial case or covering of the mass. The 

 genital pouch, which is formed by the folding back of 

 the external integument far into the interior of the ab- 

 domen, is rather larger in this species than in other cock- 

 Fig. 12. Panchiora viri- roachcs SO far as kuowu, and the invagination extends 

 dig: egg mass — en- hack through rather luorc than two segments. The 

 arge (ongina ). youngliatch withinthisvaginal Chamber, wMchis large 

 enough to afford space for their movement and post-natal development. 

 The eggs developed in the twin ovaries are matured in couples and 

 passed out into the vaginal space. The typical egg capsule or ootheca 

 of other roaches is, according to Miall and Denny, formed about the 

 eggs within the vaginal pouch from a fluid secreted by the many- 

 branched colleterial glands which open into the under side of the uterus 

 near the extremity of the latter. This egg-capsule is practically want- 

 ing in Panchiora viridis and can be detected only by very carefully 

 dissecting the egg cluster, when a thin membranous sheath is found 

 to inclose the inner or basal half of the mass or about one-half the 

 length of the eggs. Judging from this rudimentary nature of the egg 

 capsule, if this partially inclosing membrane may be so styled, the col- 

 leterial glands must be much reduced or almost wanting in Panchiora. 



