Mr. R. Shelfoid's Studies of the BlatticLv. 513 



and extending as far forward as the third abdominal 

 sternite ; this brood-sac is, as in the other viviparous 

 species, connected with the genital pouch. The eggs 

 number from 36 to 40 and are retained in the brood-sac 

 until mature ; they do not form a crescentic mass as in 

 Panehlora viridis. The left colleterial glands are absent, 

 but those on the right are well developed. It is by no 

 means clear that these glands secrete the chitinous ootheca 

 of Periflancta, etc. ; it is remarkable to find that on one 

 side at least they are well developed in a species whose 

 eggs are enclosed in a thin membrane. I have not been 

 able to dissect Molytria macxdata, Br., as I have nothing 

 but dried specimens, but I have frequently removed egg- 

 masses in all stages of development from the brood-sacs 

 of freshly-killed females during my sojourn in the Eastern 

 tropics and I have several of these egg-masses in my 

 possession now ; they are larger than those of Panesthia 

 javanica, but otherwise show no differences worth con- 

 sidering at present. I hope ere long to study the 

 embryonic development of these two viviparous genera 

 Panesthia and Moh/tria ; it is possible that it differs 

 considerably from that of oviparous species. Viviparity 

 is now known to occur in six of the eleven sub-families 

 of Blattidm, viz. Epilamprinse (4 genera), Panchlorinse, 

 Bldberinx, Oxyhaloinse, Perisphseriinm, Pancsthiin^ (one 

 genus each), aiid is consequently of more usual occurrence 

 than was suspected ; I think it likely that it will be 

 shown eventually that it occurs almost, if not quite, 

 universally amongst the Epilamprins}. Ettstegasta is a 

 genus placed by all authors in the Perisphmi'iinm, but in 

 the majority of its characters it is much more closely 

 allied to the Epilamprinm than to the other members of 

 the PerisphieriinsB and it is of interest that viviparity 

 occurs in this genus. 



Note. — Just before going to press I received alive a 

 female specimen of Panehlora virescens, Thunb., and some 

 females of Phyllodromia gcrnianica, L. Mr. H. Main, to 

 whom I am indebted for the latter specimens, informs me 

 that P. r/ermaniea $ carries the egg-capsule protruding 

 from the tip of the abdomen for some weeks and deposits 

 it only one or two days before the contained young hatch 

 out. I was surprised to observe in the living female of 

 Pmichlora vireseens an egg-mass partially protruding from 

 the end of the abdomen ; so far as can be determined 



