512 Mr. R. Shelford’s Studies of the Blattide. 
young and find that below the genital pouch lies a forward 
prolongation of it with rather thick walls; this is the 
brood-sac and as it is not much larger than the genital 
pouch itself and much smaller than the brood-sac in 
Panchlora viridis and in Molytria maculata and Panesthia 
javanica, as described below, it is rather difficult to explain 
its function, unless one supposes that it becomes very much 
dilated as the fertilized eggs pass into it from the uterus, 
its walls then becoming membranous and the whole organ 
pushing forward to lie amongst the abdominal viscera as 
is the case in other viviparous species. The brood-sac 
was empty in the specimen examined; the genital pouch 
Dissection of Panesthia javanica, ? , showing brood-sae, etc. 
3-7 = Nos. of segments. U.= Uterus. 
R. = Rectum. Ov. = Ovary. 
G.P. = Genital pouch. Br. = Brood-sac. 
C.G. = Colleterial gland. N.= Branches of ventral nerve-cord. 
Sp. = Spermatheca. 
had thick muscular walls, and when opened the four finger- 
like gonapophyses were seen attached to the dorsal wall 
and directed backwards; in the ventral wall was seen 
the orifice leading to the brood-sac and lying at the 
bottom of a depression in the wall of the pouch, The 
right colleterial gland was well developed, but the left one 
was aborted. 
In Panesthia javanica, Serv., the egg-mass, which is 
about 18 mm. long, is contained in a thin-walled brood- 
sac lying asymmetrically on the left side of the abdomen 
