LONGICORNIA. 235 
Crotch placed this species in the genus Nothopleurus. It approaches, in fact, this 
genus very closely, the metathoracic episterna being slightly concave on their inner side ; 
but the typical Wothopleurt have, in addition, the same parts very much narrowed, 
whilst in the present species they are but little narrower than in the genus Mallodon. 
The species, in fact, bridges over the difference between the two genera which Leconte 
(Class. Col. N. Am. 1873, part ii. p. 287), not knowing the typical species of Notho- 
pleurus, declined to separate. NV. mandibulare has, however, a further peculiarity in 
common with Nothopleurus, and which distinguishes the genus from Mallodon; this is 
the form of the hind angles of the thorax and the adjacent lateral margins; the margin 
is here obliquely sinuate, with a long spine anterior to and a shorter spine posterior (at 
the angle itself). Stenodontes in both sexes presents the same constant peculiarity of 
structure. 
4, Nothopleurus lobigenis. 
G. Stenodonti similis. Elongato-oblongus, niger, nitidus, mandibulis ( ¢) subrectis, valde elongatis, intus rufo- 
ciliatis prope apicem unidentatis, compressis, supra carina a basi curvata, extus verticalibus; genis prope 
mandibulas margine sinuatis infra acutis, deinde in laminam obliquam prolongatis, gula et mento profunde 
incavatis ; partibus oris rufo-ciliatis; capite scabroso, medio discrete punctato; thorace quadrato, antice 
triangulariter emarginato, lateribus denticulatis ante angulum posticum spina longiori, deinde usque ad 
angulum margine obliquo levi, angulo ipso acute spinoso, disco levi (medio plagiatim punctato) lateribus 
grossissime scabroso et subsulcato; elytris pedibusque fere levibus; antennis scapo sicut in Mallodontz, 
sed grosse punctato, art. 3° quam 4"* dimidio longiori. 
Long. (excl. mandib.) 14 lin. ¢. 
Hab. Mexico, Bay of Tehuantepec (Dr. Baden, in coll. Bates). 
The narrow metathoracic episterna, with long incurved inner margins, show that this 
species belongs to the genus Nothopleurus; in the form and sculpture of the thorax it 
is very similar to Stenodontes exsertus (Oliv.), and the mandibles resemble those of 
Stenodontes. The prolongation of the lower margins of the cheeks, which go far to 
enclose the sunken throat and mentum, as in a box, are but an extreme development of 
what is seen in Mallodon maxillosum (F.). 
MALLODON (p. 8). 
Mallodon molarium (p. 9). 
To the localities given, add :—Mzxico, Presidio, Tres Marias Islands (Forrer), Jalapa, 
Paso del Macho (Hége) ; British Honpuras, Belize, River Sarstoon (Blancaneaux) ; 
Guaremata, El Reposo, Pantaleon, Teleman (Champion); Panama, Bugaba (Champion). 
Specimens of both this and UW. angustatum are named UM. mexicanum in the Sallé 
collection; a female specimen in the same collection is named by Sturm WM. chevrolati, 
De}. 
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