ÂRCANA NATURE.. ^25 



hâve already been figuredby Eschscholtz in the Zoologischer Atlas ; the two hère described serve yet 

 farther to illustrate the protean character of the genus. 



10. E. ARMATA, elongata, nigra, nitida, thorace subtiliter minus dense punctato, lateribus rotundatis, 

 postice subangustato, angulis posticis obtusis; ehjtris ovalibus, convexis, apiceparum aUenuatis,punctis 

 plus minusve distinctis seriatis, paucisque interjectis ; femoribus omnibus subfus dente longo acuto ar- 

 matis.— Long. 23-32 mill. — Tab. XII, fig. 2. 



Leconte, Annals oftheLyceum of Natural History of New York, V. 134. Colorado Désert, California. 

 The maie is narrower and more acute behind, with the posterior tibiae sinuate. This species with F. 

 femorata, which has the teeth of the thighs short and obtuse, forms group XV of my arrangement of 

 the species of the genus above mentioned. 



EMBAPHION, Say. 



11. E. CONCAVUM, elongato-ellipticum, nigrum, thoracis et elytrorum marginibus altissime reflexis, 

 illo antrorsum angustato, disco parce punctulato, lateribus parcius subtilius muricatis, elytris subtiliter 

 muricato-punctatis, brevissime hispidis. — Long. 19 mi!!.; lat. 10 mi!l. — ïab. XIÏI, fig. 10. 



Leconte, Proceedings ofthe Academy of Natural Sciences of Philadelphia, VI, 446. Texas. This spe- 

 cies resembles in ail its characters E. muricatum, Say, but differs by the longer and narrower form 

 and the moresuddenly reflexed and almost perpendicular sides of the elytra. 



PELECYPHORUS, Sol. 



12. P. CARiNATus, niger opacus, thorace longiore quadrato, medio elevato et varioloso, lateribus crenu- 

 latis, subreflexis variolosis; elytris marginatis rotundato-ovatis, apice acutis valde declimbus, dorso 

 rugosis, costa utrinque abbreviata cum margine parallela. — Long. 21 1/2 mi!!. — Tab. XII, fig. 1. 



Leconte, Annals of the Lyceum of Natural History of New York, V, 128. San Felipe, at the base of 

 the mountains limiting the Colorado Désert westwardly. 



13. P. ELATUS, niger, capite excavato ; thorace latitudine breviore, lateribus antice latissime reflexis 

 medio angulatis, angulis omnibus distinctis; elytris oblongo-ovalibus, postice subacutis, convexis, thorace 

 plus duplo latioribus, minus profunde rugose punctatis, sutura lineisque tribus lœvibus, humeris minutis 

 porrectis. — Long. 35 mill. — Tab. XII, fig. 7. 



Leconte, Proceedings of the Academy of Natural Sciences of Philadelphia, VI, 445. Texas. Allied to 

 this species is P. difformis, Lee. (loc. cit., VII, 223) ; the latter, however, differs by the narrower form 

 and strongly striate elytra; it is found in Arizona. 



The two species above mentioned serve to illustrate, in a small degree, the varied form of the 

 Pelecyphori of North America. Lacordaire has separated them as a distinct genus, Philolithus, which 

 does not appear to me capable of being retained. The only différence between it and Pelecyphorus, is 

 that the external terminal angle of the anterior tibiae is distinct in the latter and slightly prolonged, 

 while in the former it is rounded. Now I do not find an exact correspondence between our species in 

 this respect. P. elatus, for instance, has the angle distinct but rounded, while in P. carinatus it is 

 much less prominent. In P. Mrsutus, rimatus and some others, it is quite as acute as in Asida or 

 Euschides. For this reason, I hâve not adopted the genus proposed by my learned friend, who states 

 with a proper caution, that the gênera of this portion of the tribe Asidites are very indefinite and 

 separated by very feeble characters. The only character of moment which I find to separate Asida 

 I. 32 



