BLATTIDiE. 
61 
the small household species, common throughout the tropics; it is 
winged, of a brown colour with varied dark markings. 
Stylopyga (Blatta) orientaiis, Linn, is a widespread species, believed 
to have been introduced to Europe from tropical Asia and now carried 
over the world in ships. It is a dark 
coloured insect of a length of a little 
over an inch; the tegmina do not 
reach to the apex of the abdomen 
and cover only the basal five 
segments. The males alone are 
winged. The development in Europe 
is stated to occupy as much as 
four years, the duration of each 
instar being very long. Stylopyga 
rhombifolia, Stoll, (fig. 9) is a larger 
Fig. 11— Periplaneta Australasia:. w j n gi ess form, brown, with varied 
yellow markings, found also in houses. This is the most common 
household species next to the large winged Periplaneta australasice , F. 
Periplaneta includes the two large cockroaches so common in houses 
and on board ships. Both are winged, red brown with lighter markings 
on the pro thorax. P. australasice , Fabr. (fig. 11) is smaller than P‘ 
americana , Linn, the prothorax more wholly dark. The latter has the 
startling habit of flying about in the house before rain falls and is 
accounted a reliable weather prophet. This habit is possibly a relic 
of the instinct of its original free-living ancestor, which flew up into 
safety before the fall of heavy rain. Rhyparobia maderce, Fabr. is a 
cosmopolitan species, carried over the world by commerce. Leucophcea 
surinamensis, Linn, is a smaller thickset insect, the prothorax black, 
the tegmina brown ; it is common in the open and is widespread over 
the tropics. Panesthia regalis , Wlk. is a peculiarly striking species, 
black with a broad band of orange across the tegmina. It is one of 
the rarer plains’ species. Corydia petiveriana , Linn, is a beautiful 
cockroach of South India, the tegmina having large white spots. Hete- 
rogamia (Polyphaga) indica, Wlk. resembles a large round woodlouse, 
wingless and nearly circular in outline. 
Collecting. —Cockroaches are found by searching under stones, 
among fallen leaves, on herbage and bushes, on the bark of trees, and 
