NATURAL SCIENCES OF PHILADELPHIA. 
65 
M. striatum, elongatum depressum, rufescens nitidiim, capite thoraceque 
nigricantibus, illo parce et vage, hoc subseriatim parce punctato, latitudine 
longiore, postice subangustato, lateribus late rotundatis, angulis subrectis 
rotundatis, linea dorsali lata Vxyi, postice utrinque breviter impress© ; eljtris 
striis sex temiibus antice punctatis, alterisque externis obliteratis, in striis vix 
brevissime pilosis, Isete rufis, margine laterali quadranteque postico nigris. 
Long. -07. 
Colorado River, at Fort Yuma. The impressions towards the base of the 
thorax limit the dorsal smooth space, and are formed by the confluence of three 
or four punctures. The pygidium is larger and more prominent than in M. 
rufipenne, and is nearly horizontal. 
Closely allied, and belonging to the same genus is Rhizophagus c a p i t o 
Fairemaire, a species found in the Sandwich Islands. On comparison, 
however, it is seen that the punctures of the thorax are larger than in M. 
striatum, though also unequally distributed in rows ; the punctures and striae 
of the elytra are deeper, the red portion of the latter extends from the base 
for only one third the length, and finally the head thorax and under surface are 
black, with only the feet and and antennae red. 
f Aphodius Illiger, 
A. d e n t i g e r , obovalis convexus, ater nitidus, clypeo parce punctato hand 
tuberculato, antice declivi, ad apicem linea elevata angulata notato, et sub- 
reflexo, dentibus duobus acutis parvis armato ; thorace brevi antrorsum sub- 
angustato, angulis omnibus rotundatis, lateribus subrectis, parce punctato, ad 
basin subtiliter marginato ; elytris striis punctulatis, interstitiis planis, biseria- 
tim parce punctulatis, mesosterno hand carinato ; tibiis anticis valde triden- 
tatis, posticis spinulis sequalibus coronatis. Long. '25. 
Copper mines of the Gila, Dr. Webb ; one specimen. Very distinct from all 
others in my collection by the peculiar construction of the apex of the clypeus ; 
the outline is not emarginate, but the apical portion is slightly deflexed and 
marked with a transverse elevated angulated line, meeting the margin each 
side within the base of a small but acute tooth. The clypeus is not perceptibly 
tuberculate, or I might give the species to the same division with A. ursinus, 
a 1 e u t u s and others from Western America ; were it not that the terminal 
fringe of the posterior tibise is composed of equal spines it could be placed near 
A. bi col or. In A. oblongusmay be observed two similar teeth at the 
anterior part of the clypeus, but there is no intermediate elevated line, and 
the base of the thorax is broadly sinuate each side. 
A. militaris, oblongus ferruginous, nitidus, clypeo modice punctulato, 
antice utrinque parce minus subtiliter granulate, postice obsolete tritubercu- 
lato, ad apicem late truncato, acute bidentato, thorace subtilius punctato dis- 
tinctius versus latera, transverse, lateribus rotundatis fortius marginatis, ad 
basin subtilissime marginato, elytris striis tenuibus punctulatis, interstitiis 
planis, dense subtilissime punctulatis, biseriatim subtiliter punctatis, mesos- 
terno hand carinato, tibiis anticis valde tridentatis, posticis spinulis insequa- 
libus coronatis. Long. -2. 
San Diego, California. I am inclined to place this in the same division with 
the preceding, though the apical fringe of the posterior tibiae is composed of 
unequal spines. 
EupARiA Lepell. (emend. Er.) 
Eu. CO gnat a, oblonga, nigra, clypeo subemarginato, punctato, antice 
rugoso, thorace punctulato et parce punctato, latitudine breviore, lateribus 
parallelis, antice paulo rotundatis, elytris striis crenatis modice profundis pos- 
tice exaratis, interstitiis antice parum convexis, humeris prominulis. Long. 
•17— -23. 
Texas and Senora ; Mr. Haldeman and Dr. Webb. Resembles Eu. stereo- 
r a t o r , but the thorax is more transverse, and not at all narrowed towards 
1858.] 
