182 
PROCEEDINGS OF THE ACADEMY OF 
XVII. Thorax subquadrate, prosternum mucronate ; humeral angles distinct. 
E. granulata. 
XVIII. Thorax subquadrate, prosternum not mucronate, humeri produced. 
E. humeralis. 
XIX. Thorax rounded, remote from the elytra, the latter oval, without humeral 
angles. E. consobrina, marginata, Pischeri. 
XX. Thorax more or less constricted at base, with distinct .basal angles ; 
elytra variable in form. E. product a, plan at a, reflexi- 
collis, parvicollis, clavicornis, rotundipeniiis, 
stricta, subligata, intricata, cordata, tubercu- 
lata, viator, pimeloides. 
Blaps opaca Say, has the first and second joints of the anterior tarsi of 
the male slightly dilated, and covered beneath with a dense brush of hair, and 
must therefore constitute a new genus. E. depressa Lec. has the form 
almost of a Akis, and having a trilobed mentum elevated at the apex, should 
also be separated ; it seems to be allied to Embaphion, without, however, be- 
longing to that genus. 
E. dispersa, oblonga, nigra, nitida, thorace parce subtiliter punctato, 
latitudine paulo breviore, lateribus valde rotundatis subtiliter marginatis, ad 
basin subsinuatis, angulis posticis rectis: elytris elongatis thorace latioribus 
densius punctatis, punctis dorso subseriatis, versus latera et apicem transver- 
sim confluentibus et muricatis, baud marginatis, dorso (feminae) planiusculis, 
postice valde declivibus. Long. 1-14. 
Creek Boundary, Dr. "Woodhouse. Of the same form as E. obscura, but 
with the thorax larger and less convex, the elytra a little more elongated and 
not at all striate ; the punctures are slightly muricated, even on the middle of 
the back ; at the sides and tip they become confluent transversely and more 
elevated, with a very short black bristle at the apex of each ; the sides of the 
elytra are not at all margined. The under surface and legs as in E. obscura, 
except that the tooth of the anterior femora is a little less obtuse 
The species of this group are related by the closest resemblances of form and 
sculpture, so much so that they may in some cases be considered as races, or 
geographical varieties. The one above described is remarkably distinct from 
the others, and must in all events rank as separate. Not so perhaps with a 
singular female specimen collected by Capt. Pope in New Mexico, which with 
the form of E. sulcipennis, exhibits an entire want of eljtral grooves, except at 
the sides behind the middle, where some faint traces are seen : the punctures 
are submuricate, and arranged in stria distinct on the back, confused at the 
sides ; between the rows are distant punctures as in E. obscura ; the tips are 
abruptly declivous, and furnished with rows of tubercles, alternately large and 
small, the latter corresponding to the striae of the anterior portion. The speci- 
men is 1-20 long, and the teeth of the anterior femora are very obtuse. For 
convenience this may be called E. del eta. 
Other specimens, both male and female, found in Arizona have also the 
form of E. sulcipennis, but the thorax is more convex, less flattened and less 
punctured at the sides, and more finely margined ; the grooves of the elytra 
are deeper, the interstices more smooth and shining, with much fewer scattered 
punctures ; sexual characters precisely as in E. sulcipennis. Length 1-14-1-30. 
This may be named E. a r a t a . 
XL 
E. t e X a n a, oblonga nigro-picea, parum nitida, capite punctato, thorace 
subtiliter parce punctulato, transverso, capite quadruple latiore, supra parum 
convexo, lateribus late depressis et paulo reflexis, subrugosis, maxime rotun- 
datis postice subsinuatis, ad basin truncato, angulis posticis rectis, anticis acutis 
acuminatis; elytris thorace angustioribus parallelis marginatis, dorso planis 
[Oct. 
