CATOGENUS. 501 
The species are very similar to one another and it is therefore difficult to distinguish 
them ; the details of the striation of the elytra, as well as the general form of the body, 
the shape of the prothorax, and the structure of the antenne, offer the chief means of 
separation ; some are said to be extremely variable in size. Several of the species 
present a more or less distinct median channel on the head, extending from the 
depression at the vertex to the labrum; this is the case with the first three species in 
the following arrangement, while in the others the channel is either very obsolete or 
entirely absent. 
1. Catogenus integratus, sp. n. 
Angustus, piceo-brunneus, nitidus, elytris dilutioribus ; prothorace suboblongo, posterius perparum angustato, 
parum punctato, margine laterali antrorsum subabbreviato. 
Long. 15 millim. 
Hab. Mexico, Temax in N. Yucatan (Gaumer). 
This is closely allied to the following species, but the thorax is even less narrowed 
behind, and the oblong dorsal impressions on it are absent, as are also the punctate 
spaces, which in some other forms represent the depressions. ‘The antenne are thick, 
not elongate, the terminal two joints a little more slender than those preceding them. 
The median channel of the head is remarkably definite. The thorax is comparatively 
longer and narrower, less narrowed behind, and with the hind angles less marked and 
less plicate than usual. ‘The elytra are very deeply striate, and the strie at the extreme 
base are somewhat irregular, the first and second and the third and fourth being 
paired and connected, while the fifth and sixth do not quite reach the base, but are 
separated slightly from a vague depression which exists in front of them. The femora 
are broad. 
Although we have received only one specimen of this insect, I feel no doubt as to 
its being distinct from C. germanus. It cannot be confounded with any other of our 
species of Catogenus. 
2. Catogenus germanus, sp.n. (Tab. XVI. fig. 1.) 
Angustus, brunneus, nitidus ; prothorace posterius minus angustato, margine laterali antrorsum subabbreviato, 
parum punctato, dorso posterius in medio vage depresso, in depressione biplagiatim punctato, inter plagas 
levigato. 
Long. 9-12 millim. 
Hab. Mexico, Cordova (Sallé), Jalapa, Tehuantepec, Bobo (Hége), Yucatan (Sal/é) ; 
Guatemala, Mirandilla, El Reposo (Champion) ; Nicaragua, Chontales (Belt); Panama, 
Tolé (Champion). 
This is narrower than our other large species and has short antenne; the longitudinal 
channel on the middle of the head is distinct, though not deep. The narrow thorax 
is transversely convex, and exhibits the peculiarity that the lateral margin does not 
