ARC AN A NATURÆ. 
1-25 
hâve already been figured by Eschscholtz in tho Zoologischer Atlas ; the two here describcd 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 ; elytris ovalibus, convexis, apiceparum attenuatis, punctis 
plus minusve distinctis seriatis, paucisque interjectis ; femoribus omnibus subtus dente longo acuto ar- 
matis. — Long. 23-32 mill. — Tab. XII, fig. 2. 
Leconte, Annals of theLyceum of Natural History of New York, V. 134. Colorado Desert, California. 
The male is narrower and more acute behind, with the posterior tibiæ sinuate. This species with E. 
femorata, which lias the teeth of the thighs sh^trt 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 snbtilius muricatis, elytris subtiliter 
muricato-punctatis , brevissime hispidis. — Long. 19 mill. ; lat. 10 mill. — Tab. XIII, fig. 10. 
Leconte, Proceedings of the 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. carinatüs, niger opacus, thorace longiore quadrato, medio elevato et varioloso, lateribus crenu- 
latis, subreflexis variolosis; elytris marginatis rotundato-ovatis, apice acutis raide declivibus, dorso 
rugosis, costa ulrinque abbreviata cum margine parallela. — Long. 21 1/2 mill. — 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 Desert westwardly. 
13. P. elatüs, niger, capite excavato ; thorace latitudine breviore, lateribus antice latissime reflexis 
medio angulatis, angulis omnibus distinctis; elytris oblongo-ovalibus, postice siibacutis, convexis, thorace 
plus duplo latioribus, minus profunde rugose punctatis, sutura lineisque tribus lœvibus, humeris minutis 
porrectis. — Long. 33 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 tibiæ 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. carinatüs it is 
much less prominent. In P. hirsutus, rimatus and some others, it is quite as acute as in A sida or 
Euschides. For this reason, I hâve not adopted the genus proposed by my learned friend, who States 
with a proper caution, that the généra 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 separatc Asida 
32 
i. 
