Forficulide and Chelisochide, families of Dermatoptera. 109 
transversum, rectangulare ; @ valde angustatum: forcipis bracchia 
¢ basi subcontigua, primum divergentia, in dimidio longitudinis 
repente incurva; margine interno prope basin saepius dente forti 
armata, apice incrassata et bimucronata: @ recta, simplicia, 
gracilia, inermia. 
Type of the genus.—Ancistrogaster luctuosus, Stal, 1855, 
Ofv. Vet. Akad. Forh., vol. xu, p. 349, ¢. (Brazil.) 
I have retained this genus only for the typical species 
with the sides of the abdominal segments recurved into 
depressed sickle-like hooks. 
Sub-family 7.—FORFICULIN A. 
I use this sub-family in a very restricted sense, as includ- 
ing the typical genus Forficula, Linn., and the closely allied 
Apterygida, Westw., sensu stricto, It is characterised by 
the form of the antennz, in which the fourth segment is 
much shorter than the third, and only half as long as the 
fifth. 
TABLE OF GENERA. 
1. Forcipis bracchia ¢ basi dilatata et de- 
planata Se 5 1. Forricuna, Linn. 
2. Forcipis bracchia ¢ basi remota, gracilia, 
nec deplanata, nec dilatata... ... 2 AprERyYGIDA, Westw. 
Genus 6.—Forricuta, Linn. 
Corpus convexum ; caput cordiforme, globosum suturis ssepe in- 
distinctis ; antenne 10-15-segmentatz ; 1 magnum, incrassatum ; 2 
minimum, globosum ; 3 longum, primum subequans, apice paullo 
incrassatum ; 4 quam 3 dimidio brevius ; 5 sensim longius ; cetera 
gradatim longiora, subclavata ; pronotum szepius capite angustius, 
margine antico truncato ; marginibus lateralibus aut parallelis, aut 
convexis ; margine postico rotundato ; szepius subquadratum, necnon 
latius quam longius, aut dimidio postico toto late rotundato, arcuato ; 
prozona plus minus tumida, metazona deplanata ; marginibus later- 
alibus paullo reflexis: elytra perfecte explicata, sat longa, vel brevia, 
truncata ; carinula humerali inconspicua, carina ipsa nulla, sed elytra 
a humeris ad apicem sensim plicata; ale aut abbreviatie, aut long, 
seepius prominentes : pedes typici, femoribus haud valde incrassatis ; 
tarsorum segmentum 3 quam primum longius ; segmentum 2 latum, 
dilatatum, bilobum, cordiforme ; abdomen circa medium subdila- 
tatum, plicis lateralibus segmentorum 2 et 3 distinctis: segmentum 
ultimum dorsale ¢ magnum, quadratum, margine postico szepe 
