82 
PROCEEDINGS OF THE ACADEMY OF 
One male from Sonora, Dr. Webb. Of the form of the male of M. d a s y s t o- 
m u s , but readily known by the thorax not being marked with bright facets 
separated by opake spaces, also by the posterior angles being obliquely but 
broadly emarginate, so that a prominent angle is formed before the base, and 
another at the base itself, and finally by the more slender mandibles having 
a strong tooth near the tip, and being only sparsely pilose internally. The 
under surface of the head is much more deeply excavated than in M. dasysto- 
mus, and the gular margins much more elevated ; the gense are broadly 
rounded with one subacute angle, while in the other they are emarginate. 
Elaphidion Serv. 
E. V a 1 i d u m , fusco-piceum nitidum, fusco-pubescens, et parce pilosum, 
thorace latitudine hand breviore, lateribus rotundatis postice angustato, 
fortius punctato, dorso subdepresso quinque calloso, macula magna sericeo- 
pubescente laterali utrinque antica, elytris parcius postice subtilius punctatis, 
ad apicem subtruncatis, sutura spinosa, antennis corpore brevioribus ad basin 
'omssiusculis, articulis 3 — 6 apice breviter unispinosis, femoribus muticis. 
Long. -83— 1-0. 
Texas, Messrs. Haldeman and Schott. The sericeous patch of yellowish 
Irair each side of the thorax in front recalls the European genus Stromatium. 
E. p r o t e n s u m , elongatum, fusco-piceum, tenuiter parce cinereo-pu- 
bescens, thorace latitudine longiore, antice posticeque angustato, lateribus 
subangulatim rotundatis, rude punctato, transversim subplicato, callo dorsali 
nitidiore subelevato, scutello dense pubescente, elytris thorace latioribus, 
antice fortiter, postice subtilius punctatis, ad apicem longe bispinosis, femori- 
bus ad apicem spinosis, antennarum articulis 3 — 6 Sjiinis sensim brevioribus 
armatis. Long. 1-22. 
One female found in Sonora by Mr. Schott. The form is about proportioned 
as in E. p a r a 11 e 1 u m . This species is very conspicuous by its large size. 
Eriphus Serv. 
"E ? ruber, Isete coccineus, nitidus, pilis erectis nigris parce vestitus, elytris 
grosse modice punctatis, postpectore nigro, antennis extrorsum, tarsisque 
fusco-nigris, (antennis tibiarumque apice rare nigris). Long -4 — -42. 
Eagle Pass, Mr. Schott. Resembles E. suturalis, so closely, that I was 
for a time unwilling to consider it as distinct. The size is much greater, and 
the punctures of the elytra more numerous and comparatively smaller : the 
basal joint of the antennae, except in one specimen, is red ; a character I have 
never observed in E. suturalis. 
Arhopalus Serv. 
A. e u r y s t e t h u s , ferruginous, subtus dense pallide sulphureo-pubescens, 
thorace fusco, dense sulphureo-pubescente, transverso, ad basin declivi, lateri- 
bus rotundatis ante basin angulatis, elytris fuscis piceo-pubescentibus, fascia 
lata dentata ad quadrantem, linea angulata ad medium, fascia lata pone me- 
dium et linea angulata pallide sulphureis ornatis, ad apicem singulatim longe 
acuminatis ; pedibus late distantibus, prosterno postice subproducto, late 
subtruncato. Long. -58 — .80. 
Sonora, Mr. Schott. The lateral angle of the thorax is sometimes distinct, 
sometimes indistinct, never acutely prominent as in A. e r y t h r o p u s . This 
species belongs to a group in which the anterior feet are widely separated, 
the presternum broadly and slightly produced posteriorly, and the mesoster- 
num suddenly declivous in front, thus exhibiting a tendency to Megaderus, 
which with the Trachyderides should immediately follow this group in a 
natural arrangement. 
March, 
