112 



those of the Old World ; I have named it Trichoton 

 from the Greek word t/^wto? Pilosus, placing it in 

 the neuter gender, as according with the original 

 Fabrician genus Opatrum ; the specific name of 

 Cayennense is the country from whence it was 

 received. 



Isopteron, Hope. 



Corpus elongatum, elytris thorace triplo longi- 

 oribus. Caput antice fossula transversa sulcatum 

 postice rotundatum clypeo emarginata; — Thorax 

 fere semicircularis angulis posticis externe fortiter 

 incisis, Scutellum magnum. Elytra antice, et pos- 

 tice fere sequalia. Corpus infra scabrum punctatum 

 femora antica fortiter sulcata, quatuor posticis fere 

 integris, at externo sinuatis. Tibiae anteriores den- 

 tatse, reliquis inarmatis et elongatis. Habitat in 

 Nova Hollandia. 



In concluding my observations on the genera of 

 Opatridae, I have to remark, that I have adopted 

 the genera of Microzoum, Leichenum, and Pilio- 

 bola of Solier, feeling satisfied that they form sub- 

 genera. The name of Microzoum, however, should 

 be changed to Microzoon ; that of Leichenum should 

 I think, be changed, and Piliobola be altogether 

 expunged. I am in doubt if the above genera are 

 published with details or not; if not, it remains with 

 future writers to name them anew. 



Fabrician Species. 



Sp. 3. Obscurum. — On Westermann's authority, 

 I record this species as an Asida. 



