72 Trans. Acad. Sci. of St. Louis 
dish brown. Eventually all change entirely to a reddish 
brown. 
Although the adults and nymphs of the roach may 
appear in abundance about the house, the egg cases are 
rarely seen. The reason for this was discovered in the 
habits of those kept for close observation in the Jabora- 
tory. In the great majority of cases, the mother very 
deftly conceals the egg case, either by depositing it in a 
erevice or by carrying earth and debris, sometimes for 
considerable distances, and with this and her saliva, 
daubing the new case until it is quite hidden from view. 
This is so stealthily done that I have never been able to 
eatch her in the very act, but the result leaves no doubt 
that the act is deliberately and purposely done. Of 
course the insects in their native habitat have every 
chance to conceal the egg cases beyond all chance of our 
ever finding them; even in glass jars, with a limited 
amount of material with which to work, they succeeded 
so well that in a few cases I myself did not discover 
them until I had injured them in handling. 
A large number of females carrying egg cases were at 
different times placed in the jars, together with a small 
amount of earth and rubbish, just to see what would 
be their course of action. Out of 90 egg cases thus de- 
posited, 36 were deposited in some place which afforded 
some concealment, as crevices in bark, the cells of old 
wasp nests, under a bit of paper or, in a few cases, in 
slight depressions which, I was sure, the mother roach 
had made in bark or clay, expressly to fit and receive her 
dotheca. Many, if not the majority, of these were also 
daubed. Of those which were dropped on the bottom of 
the jars (this open space formed by far the greater part 
of the available space), 38 were well hidden by having 
been daubed with dirt and rubbish stuck on with saliva, 
