82 FAMILIES OF PETALOCERA WHICH FEED ON 



Capitulo 3-phyUo elongato, ovalo. 

 Labrum exsertum, trigonum, antice medio prodtictum. 

 Mandibulae subarcuatcE, cornece, validce, apice secpius suh- 



emarginata. 

 ^a.xi\\x mandibuliformes, sitbarcuat<E, cornea, detttatte vel 



inermes, scepius edentula. 

 Palpi maxillares subclavati. 

 Palpi labiales breves, articulo extimo. subovato, 

 Mentum subtransversum planiusculum, medio scepius pro- 



ducto, basi palpigerum. 

 Caput semicirculare aut snbquadratum ; Clypeo sutura 

 transversa distinda. Corpus ovatum. Thorax 

 transversus, siibquadratus ; ScuteUo distincto. 

 Sternum scepius productum. Pedes robusti, fe- 

 moribus posticis interdum incrassatis. 



Observations. 



This family derives its name from an Australasian genus 

 nstituted by Dr. Leach, and which appears to be the type 

 ■of the family. The triangular labrum, mandibuliform max- 

 illae, and singularly acuminate mentum, will of themselves 

 be sufficient to indicate what other genera ought to be 

 associated with Anophgnathus to form the family. At the 

 same time due regard ought to be paid to the modifications 

 which these several characters may undergo in different 

 genera. But though the AnoplognathidcE. will thus be 

 found to be composed of a number of very distinct insects, 

 no additions have yet been made to the original genus, 

 with the exception of Mr. Kirby's remarkable genera Ge- 

 niates and Apogonia. 



The external appearances by which the sexes of insects 

 are distinguishable from each other, though not forming 



