NATURAL SCIENCES OF PHILADELPHIA. 
the eyes, and the front is therefore narrowed at that point. The month is a 
little more elongated, bnt I observe no character worthy of mention in the oral 
oro-ans ; the labrum is rounded in front. The antennae are nearly as in L. 
lemniscata, but shorter, and with the joints less loosely articulated. The spurs 
of the posterior tibiae are equal and slender ; the ungues are double, but the 
inferior part is about one-third shorter than the upper, and is soldered to it, so 
as to form a large tooth, which does not descend abruptly as in Lytta erosa, 
but is rather as in L. elegans. The anterior femora are filiform and uniformly 
pubescent, having no trace of the slight inferior emargination and patch of 
sericeous hair seen in most species of Lytta. 
P. alticeps, elongata, opaca atra, capite lateribus cinereo-pubescente, 
conoideo, vertice conico elevato, subacute, fronte canaliculata, thorace |cam- 
panulato, linea dorsali insculpto, ad basin medio impresso, elytris thorace 
duplo latioribus, minus profunde subtiliter scabris, sutura lineisque angustis 
quatuor indistinctis parum elevatis, calcaribus unguiculisque rufis. Long. 
•58— -85. 
Sonora, Mr. Schott. The thorax is not perceptibly punctured, and the front 
is marked with only a few scattered points. The middle tibise of the male are 
curved, much dilated, and very profoundly excavated along the inner face from 
near the base to the apex : the anterior legs are alike in both sexes, the pos- 
terior legs of the only male prociired are wanting. 
Nemognatha Illiger. 
N. discolor, luteo-testacea, nigro-villosa, thorace sat dense punctate, 
transverse, lateribus rectis, elytris dense subtilius punctatis, vitta utrinque 
lata nigro-picea antice abbreviata ; antennis nigris, tibiis tarsisque infuscatis, 
calcaribus posticis obtusis concavis, externo paulo latiore. Long. -37. 
Texas, Mr. Haldeman, one specimen. Closely allied to N. p i e z a t a , but 
the under surface is of the yellow color as the upper, while that species is black 
beneath. Varieties of N. piezata were brought by Mr. Haldeman, in which the 
usual elytral vittse are completely wanting. 
N. longicollis, elongata, fusco-lutea, breviter nigra-pubescens, capite 
fusco, valde elongate, piano punctate, spatio frontali Isevi, ore producto, thorace 
latitudine sesqui longiore, antice attenuate et utrinque late impresso, modice 
punctate, elytris thorace duplo latioribus, confertim rugose punctulatis, sutura 
margineque infuscatis ; pectore obscure, antennis nigris extrorsum paulo incras- 
satis, articulis arete conjunctis ; tibiis posticis calcaribus planis obtusis, interne 
latiore ; maxillis corpore paulo breviores. Long. *25. 
Ringgold Barracks, Texas, Mr. Haldeman. This species belongs to the genus 
Gnathium of Kirby, but I do not think it necessary to retain it as distinct from 
Nemognatha. It may indeed be a variety of N. minima Say, (a species 
otherwise unknown to me), but differs considerably in color from the descrip- 
tion given by him. 
Bruchus Linn. 
B. uniformis, oblongo-ovatus, fusco-ferrugineus, dense cinereo-pubescens, 
thorace latitudine longiore, antrorsum angustato, lateribus paulo concavis, sat 
dense grossius punctato, vitta dorsali pallidiore ssepius ornate, elytris hand vel 
vix tesselatis, striis angustis punctatis, antennis pedibusque flavo-testaceis 
oinereo-pubescentibus, illis extrorsum obscuris. Long. -17 — '20. 
Colorado Desert. Abundant in the pods of Prosopis and Strombocarpus. 
B. prosopis, oblongo-ovatus, fusco-ferrugineus, dense cinereo-pubescens, 
thorace fusco-pubescente, latitudine longiore, antrorsum angustato, lateribus 
paulo concavis, sat dense grossius punctato, lateribus vittaque dorsali inter- 
rupta pallidis, elytris striis angustis punctatis pube fusca pallidaque tesselatis, 
maculisque obscuris maioribus paucis versus latera ornatis ; pygidio fusco pal- 
lidoque variegate, pedibus flavo-testaceis, antennis obscuris, ad basin testaceis. 
Long. -15— -18. 
1858.] 
