312 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
by eating off the blue and red paints from the drawings of impor- 
tant maps. Glover . . . states that in his office 'They 
made a raid on a box of water colors where they devoured the 
cakes of paint, vermihon, cobalt and umber ahke; and the only 
vestiges left were the excrements in the form of small pellets of 
various colors in the bottom of the box.' 
"The ootheca of the Croton-bug is very light brown, a little 
over twice as long as broad, 7.5x3.5 mm., with the sides some- 
what flattened and the edges parallel. Within it the eggs, 
thirty-six in number, are arranged in the usual two rows. It is 
carried about by the mother roach for several days with from 
half to three-fourths of its length protruding from the abdomen, 
and when dropped in a favorable place the young, evidently very 
soon, emerge from it; for in a bottle in which a female with pro- 
truding ootheca was placed at eleven o'clock p. m. the young were 
found to have emerged on the following morning at eight. They 
were then wholly white, except the lateral edges of the abdomen, 
where a blackish tinge was evident. By five o'clock in the after- 
noon of the same day, having meanwhile eaten their fill of mois- 
tened wheaten bread, they had become too large for their skins, 
and had moulted for the first time. They then measured 3 
mm. in length, and the head, pronotum, abdomen, and apical 
half of antennae were black, while the other two thoracic 
rings and the basal half of antennae were a grayish white. The 
half grown young are very dark brown, with the first four or 
five segments bordered with yellow, and with traces of a lighter 
median stripe." 
American Roach. 
Periplaneta americana (Linnd). 
Figs. 26, 39. 
Blatta americana Linne, Syst. Nat., ed. 10, vol. 1, p. 434 (1758). 
Periplaneta americana Scudder, Boston Journ. Nat. Hist., vol. 7, p. 
416 (1862); Psyche, vol. 9, p. 100 (1900).— Smith, Rept. Ct. Bd. 
Agric. for 1872, p. 383 (1873).— Fernald, Orth. N. E., p. 135 (p. 51 
of sep.) (1888).— Walden, Bull. Geol. Nat. Hist. Surv. Ct., no. 16, p. 58 
(1911). 
Castaneous, the disk of the pronotum lightest, with hind mar- 
