BY EDWARD NEWMAN. 



379 



Inhabits Canada and the United States of North America. 

 Taken by Mr. Doubleday at Trenton Falls. I may here 

 observe, that the genus BoUtophagus, as at present constituted, 

 is a most lax and ill-defined group. 



The seven genera which follow Myodes agree in having their 

 tarsi heteromerous ; but, as they are not strictly referrible to 

 either of the natural orders which I have attempted to define, 

 I have concluded, that it will be as well to leave them for the 

 present, without any attempt to show their natural relations. 

 I have repeatedly found, that an opinion on this subject, ex- 

 pressed at a time when it has really received no consideration, 

 is wide of the mark, and has not unfrequently to be formally 

 retracted on some subsequent occasion. 



Natural Order. — Clerites, Newman. 

 Genus. — Hydnocera, Newman. 



\ 



Caput transversum, 

 pronum, prothorace 

 manifeste latius ; 

 oculi magni late- 

 rales, distantes : 

 antenna; minutae, 

 vix capite longi- 

 ores, lO-articulatse, 

 articulus 1"% csete- 

 rislongior, crassior, 

 cseteriat9"'".longi- 

 tudine subsequales, 

 10"'. magnus, ova- 

 tus, apice fere acu- 

 minatus : labrum transversum ; mandibulas vix incurvae, apice 

 acutse, intus dente mediano valido armatae ; maxillarum lacinia 

 minuta fere linearis, apice obtusa ; galea lacinia longior, tripio 

 latior, apice rotundata ; maxipalpi 4-articulati, articulus 1"'. brevis, 

 2"% duplo longior valde crassior, 3"^ 2°. brevior ac omnino minor, 

 4''^ brevis, angustus, fere cylindricus, apice truncatus : labium 

 mihi invisum, labipalpi reflexi triarticulati, articulus 1"'. minutus, 

 brevis, 2"'. duplo longior, 3"*. magnus, incrassatus, fere trigonus : 

 prothorax latitudine vix longior, ante marginem anticum subito 



