m FAMILIES OF PETALOCERA WHICH FEED ON 



Capitulo 3-phyllo ehngato, ovato. 

 Labrum exsertum, trigonum, antice medio productum. 

 Mandibular subarcuata, cornea, valida, apice sapins sub- 



emarginatce. 

 MnxiMztmandibuliformes, subarcuata, cornea, dentate vet 



mermes, sapius edentula. 

 Palpi maxillares subclavati. 

 Palpi labiales breves, articulo extimo subovato. 

 Mentum subtransversum planiuscidum, medio s&pius pro- 



ducto, basi palpigerum. 

 Caput semicirculare aut subquadraturn ; Clypeo suturct 

 transversa distinct a. Corpus ovatum. Thorax 

 transversus, subquadratus ; Scutello distincto. 

 Sternum scepius productum. Pedes rohisti, 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- 

 illa, 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 Anoplognathida 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- 

 hiates and Apogonia. 



The external appearances by which the sexes of insects 

 are distinguishable from each other, though not forming 



