6 INSECTA. 
F. auricularia, L.; De Geer, Mem. Insect., HI, xxv, 16, 25. 
Length, half an inch; brown; head red; margin of the thorax 
greyish; legs an ochraceous yellow; fourteen joints in the an- 
tenn. 
The two sexes in coitu are united end toend. The female 
keeps careful watch over her eggs, and for some time over her 
young ones. 
F. minor, L.; De Geer, Ib., pl. xxv, 26, 27. Two-thirds 
smaller than the auricularia; brown; head and thorax black; 
legs yellow; eleven joints in the antenne. Found more parti- 
cularly about dung-hills(1). 
BuatTra, Lin. 
Where there are five joints to all the tarsi. The wings are only 
plaited longitudinally, the head is concealed under the plate of the 
thorax, and the body oval, orbicular and flattened. 
Their antennz are setaceous, inserted into an internal emargina- 
tion of the eyes, long, and composed of a great many joints. The 
palpi are long, the thorax has the form of ashield. The elytra are 
usually of the length of the abdomen, coriaceous or semi-membra- 
nous, and slightly cross each other at the suture. The posterior ex- 
tremity of the abdomen presents two conical and articulated append- 
ages. The tibie are furnished with small spines. ‘Their crop is 
longitudinal, and their gizzard is provided internally with strong, 
hooked teeth. They have eight or ten ceca round the pylorus. 
The Blattz are very active nocturnal Insects, some of which live 
in the interior of our houses, particularly the kitchen, in bake-houses 
and flour mills; the others inhabit the country. They are extremely 
voracious, and consume all sorts of provisions. The species pecu- 
liar to the French colonies are termed there Kakerlacs or Kaker- 
(1) Add F. bipunctata, Fab.; Panz., Faun. Insect. Germ., LXXXVIII, 10;—F. 
gigantea, Fab.; Herbst., Archiv. Insect., XLIX, 1; see Palis. de Beauy.; Insect. 
d@ Afr. et ’ Amer. The two species quoted, and all those which have not more 
than fourteen joints in the antenne, compose my genus ForricuLa proper—Faun, 
Nat. du Regn. Anim. Those which have more, such as the F. gigantea and ‘others, 
form my genus Forricrsiza. All these Insects are winged. Those which are 
apterous form a third genus, that of Curtipoura. Doctor Leach also divides the 
Dermaptera into three genera: 1. Forficula, with fourteen joints in the antennez; 
2. Labidoura, with thirty; 5. Labia, with twelve. . For further details respecting 
these Insects as well as for others of the same order, see the Hore Entomologice 
of M. Toussaint Charpentier. 
