514 Mr. R. Shelford's Studies of the Blattidse. 



by a superficial examination the eggs are not in a very 

 advanced state of development ; in this specimen the egg- 

 mass is so large that it cannot be retained entirely in the 

 brood-sac ; the ootheca is represented by a thin transparent 

 membrane, which however is complete, not incomplete as 

 in the species observed by Riley. In an undescribed 

 species of Tcninoptcryx from East Africa, the female 

 carries the eggs contained in a transparent membrane 

 protruding from the end of the abdomen; in the only 

 example examined the eggs are very advanced in develop- 

 ment. These new facts enable me to modify Holmgren's 

 " series " of Blattidm as follows : — 



1. Oviparous species. Eggs enclosed in a chitinous 

 ootheca and carried by the female for a short time 

 only. 



Ex. Edohia, Blatta, Periplaneta. 



2. Ovo-viviparous species. {a) Eggs enclosed in a 

 semi-chitinous capsule and carried by the female, pro- 

 truding from the abdomen during the greater part of the 

 embryonic period. 



Ex. Phyllodromia germanica. 



(h) As above, but eggs enclosed in a transparent 

 membrane. 



Ex. Temnopteryx sp. 



3. Viviparous species. («) Eggs enclosed in a chiti- 

 nous ootheca which is retained in the brood-sac of the 

 mother. Ex. Oxyhaloa saussurei, Eustegasta micans, Blahera 

 sp. [1 Pseudophorasj^is ncbulosa and Phlebonotus pallens]. 

 (b) Eggs enclosed in a transparent membrane, which is 

 retained in the brood-sac of the mother, i. Membrane 

 complete. Ex. Molytria maculata, Epilampra hiirm-eisteri, 

 Panclilora virescens, Panesthia javanica [? Pseudophoraspis 

 nehulosa and Phlebonotus pallens]. ii. Membrane incom- 

 plete. Panchlora viridis, P. nivea. 



