Mr. R. Shelford’s Studies of the Blatiide. 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 86 to 40 and are retained in the brood-sac 
until mature ; they do not form a crescentic mass as in 
Panchlora 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 Periplaneta, 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 maculata, 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 m 
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 Molytria; 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 Blattidx, viz. Epilamprine (4 genera), Panchlorine, 
Blaberine, Oxyhaloine, Perispheriine, Panesthiine (one 
genus each), and 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 Hpilamprine. Eustegasta is a 
genus placed by all authors in the Perispheriine, but in 
the majority of its characters it is much more closely 
allied to the Hpilamprine than to the other members of 
the Perispheriine and it is of interest that viviparity 
occurs in this genus. 
Note.—Just before going to press I received alive a 
female specimen of Panchlora virescens, Thunb., and some 
females of Phyllodromia germanica, L. Mr. H. Main, to 
whom I am indebted for the latter specimens, informs me 
that P. germanica $ 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. J was surprised to observe in the living female of 
Panchlora virescens an egg-mass partially protruding from 
the end of the abdomen; so far as can be determined 
