. 
Forficulide and Chelisochidx, families of Dermatoptera. 99 
In its restricted sense, this sub-family includes the true 
Opisthocosmia and its immediate allies, genera, that is to 
say, in which the feet are long and slender, the pygidium 
very short, barely distinguishable nor even not visible, and 
the anal segment very strongly narrowed and sloping in 
both sexes ; the forceps are usually long, slender, and often 
armed with numerous teeth pointing in various directions. 
TABLE OF GENERA. 
1. Elytra haud carinata. 
2. Pronotum capite angustius ; (pedes 
eracillimi) . . . ae tee, +s 
2.2 Pronotum capite haud angustius. 
3. Segmentum ultimum ventrale 
inerme. 
—_ 
. OptstHocosMIA, Dohrn, 
4. Pygidium bifidum . . . . 2. Lipopss, n. 
4.4. Pygidium parvum, obtusum 3. Hypuraus, n. 
3.3. Segmentum ultimum ventrale 
processu utrinque armatum. 4. SARCINATRIX, Rehn, 
1.1. Elytra costa carinata. 
2. Pronotum capite angustius 5. EMBOROS, n 
2.2. Pronotum capite haud vel vix 
angustius. 
3. Als perfecte explicate ; genus 
americanum 6. KLETER, n. 
3,3, Ale abortive; genus javanum 7. Cosmrenia, Verhoeff. 
Genus 1.—OpistHocosmiA, Dohrn. 
Statura gracili ; antenna 10-12-segmentate ; segmentis omnibus 
tenuibus, cylindricis, gracilibus ; segmento 3 quam primum dimidio 
breviori ; 4 quam 8 longiori ; 5 quam 4 longiori: caput tumidum, 
suturis distincte impressis, pone oculos tumido-elevatum ; pronotum 
capite distincte angustius, longius quam latius, margine antico recto, 
postico ovato, postice subangustatum ; prozon atumida, metazona 
ampla, deplanata, lateribus reflexis ; elytra ad humeros lata, apicem 
versus subangustata, levia, margine exteriori distincta plicata, 
carinula humerali autem supra humeros ipsos haud producta ; mar- 
gine postico emarginata vel truncata; ale longe ; pedes longi, 
gracillimi ; femora vix incrassata ; tibize superne teretes, compress ; 
tarsi graciles, segmento primo cetera unita equanti vel superanti; 
abdomen basi gracile, medio subdilatatum, haud deplanatum, valde 
convexum, plicis lateralibus distinctis ; lateribus ipsis inermibus, 
