286 THE entomologist's record. 



Sub-family Ectobiin^. — Ootheca chitinous, of Blattine type. 

 Known in the following genera : — Ectohiiis, Thegannpteryx, Hololampra. 



SuB-EAMiLY PsEUDOMOPiN^. — Ootheca either of Blattine type, or 

 leathery and carried with the suture directed to one side. Known in 

 the following genera : — 



1. Blattine type, FAlipddion, Mareta. 



2. Leathery form, Hemithyrsocera, Blatella, Ischnoptera, Loboptera. 

 Sub-family NYCTiBORiNiE. — Chitinous ootheca of peculiar type. 



Known in the following genera : — Megaloblatta, Paratropes. 



Sub-family Epilamprin^. — Viviparous, ootheca represented by a 

 membrane, which may, or may not, be retained in the brood-sac. 

 Known in the following genera: — PhlebonntKs, Molytria, Paendo- 

 phoraaph, Epjlaiiipra, Kuateriosta. 



Sub-family Blattine. — Chitinous ootheca carried with suture 

 uppermost. Known in the following genera: — Polyzoateria, Blatta, 

 Periplaneta, Paeudoderopeltis, Deropeltis. 



Sub-family Panchlorin^. — As in EpiLAMPRiNiE. Known in 

 following genera: — Gyna, Bliyparohia, Leucophaea, Panchlnra, 

 Naiiphoeta. 



Sub-family Blaberin^. — Chitinous ootheca formed, but never 

 extruded, practically functionless. Known in following genus : — 

 Blabera. 



Sub-family Corydiin^. — Chitinous ootheca of modified Blattine 

 type. Known in following genera : — Polyphaya, Honweoffamia. 



Sub-family Oxyhaloin^. — Viviparous or with chitinous ootheca. 

 Known in following genera : — 



(i.) Viviparous. Oxyhaloa, Diploptera. 



(ii.) Chitinous ootheca. Chorhoneura, Ectonenra. 



Sub-family Perisphaeriin^. — The only evidence that we have about 

 the egg-laying habit of this sub-family, and that but indirect, is that 

 supplied by Mr. Distant in his " Jnsccta Tranfivaalienxm " concerning 

 Cyrtotria {Stenopilemo). A female of the species was found living in a 

 burrow in the ground surrounded by its young ; this is slight 

 evidence in favour of a viviparous habit, for the necessity of forming 

 a horny capsule is obviated by the cryptic habit, and no trace of such a 

 capsule empty seems to have been found, and it is highly unlikely that 

 a cockroach should lay eggs, like the earwig and mole-cricket, entirely 

 unprotected by an ootheca of some sort. 



Sub-fam. Panesthiin^. — Viviparous. Ootheca a mere membrane. 

 Known in the following genera: — Panesthia, Sahjanea. 



It is quite evident that the egg-laying habits can be of considerable 

 use in any scheme of classification of the Blattidae. The discovery 

 of the ootheca of Paratropes was definitive evidence in favour of the 

 inclusion of this genus in the Nyctiborinae, and the oscillations of 

 Heinithyrsocera between the Ectobiinae and Paeudomopinae are brought 

 to an end by the discovery that its ootheca is similar to that of 

 Blattella. It will be noted that so far as our present knowledge goes, 

 the egg-laying habit is diverse in only two sub families, the Pwudo- 

 mopinae, in which a leathery capsule and a chitinous capsule is formed, 

 and the (h-ylialoinae, whichexhibit viviparity and the chitinous ootheca; 

 certainly the latter sub-family is no natural one, and could well be 

 split into two, but whether the Vaeudowopinae lend themselves to the 

 same treatment cannot be decided. 



