42 



mae, a qua praecipue sulcis lougitudinalibus obscuriori- 

 bus differunt. 



IV. Dipleura. Green. 



Corpus in globura contractile. 



Caput: angulis muticis, fronte impressioiie circum 

 data, depressa, integerriraa: genis inflatis; oculis minutis 

 papillaeforraibus, ob corneara destructara hiantibus. 



Thorax 14 articulis. profundissime sulcatis; rhachide 

 vix distincta. 



Abdomen semicirculare, capite brevius, laeve. 



Genus antecedenti proximura, fortasse olim cum* eo 

 couiungendum. 



I. D. Dekaji Green. 



In Araerica boreali (Lockport in Ulstcr Co., ad Ca- 

 zenovia in Madison Co., Steuben Co., Rochester in Mun- 

 roe Co. in New York; Northhuraberland, Pensylvania) 



Caput verrucosum, rotundato-triangulare, raarginatum. 

 Protuberantia frontalis sulcis distinctis anibientibus indi- 

 cata, trapezoidea, antice parum attenuata rotundata. 



V. Conocephalus Zenk. 



Corpus ovatura, vix contractile. 



Caput angulis posticis cornigeris. Frons lata: pro- 

 tuberantia frontali abbreviata, sulco profundo circurascri- 

 pta, antice attenuata, lobata. Genae triangulares. Linea 

 facialis pone oculos parura arcuata ad angulura capitis 

 posticura progrediens. Oculi raodo tuberculo rainirao iuxta 

 frontis apioera, raodo lobo palpebrali in genarum raedia 

 parte sito indicati. Thorax 14 — articulatus: articulis pro- 

 funde sulcatis, epiraeribus cuin tergo articulatis, primum 



