(ZATUS.—HICETAON. 111 
QEATUS. 
Form of Deriles and Nuptis. Mentum trapeziform, rather flat, broadly but feebly emarginate in front, anterior 
angles acute ; inner lobe of the maxille unarmed; antenne as in Nwptis; head grooved behind the eyes, 
sides of the front slightly swollen and divergent ; epistoma not margined anteriorly in the male, similar 
in both sexes, well defined posteriorly; eyes very large and prominent, rounded, not widely separated ; 
labrum prominent; prothorax as in Nuptis, but more distinctly margined; scutellum large, transverse ; 
elytra parallel, and broader than the thorax (as in Wuptis), crenate-striate, interstices convex; pro- 
sternum deflexed behind, margined within, the apex slightly produced and embracing the coxe; 
mesosternum slightly concave in front; legs smooth, normal, the femora not incrassate as in Nuptis, 
unarmed in both sexes ; anterior tibize unarmed in both sexes; the tibie [which are slightly curved and 
thickened at their apices] on the inner side from the middle to the apex, and the tarsi beneath, thickly 
clothed with fulvous hair; epipleure gradually narrowing from the base, and extending to the apex of the 
elytra, and becoming more or less vertical beyond the last ventral segment. 
This genus will include the undescribed [phthimus chevrolati, Hopfn., from Mexico, 
&c.; the Tenebrio variolosus, Fabr., from South America; and a nondescript species from 
Guiana will probably, though differing greatly in the structure of the pro- and meso- 
sternum, have also to be included in it. Allied forms, Amenophis, Thoms., and Deriles, 
(Motsch.) C. O. Waterhouse, are found in the Old World. | 
1. @atus chevrolati. (Tab. V. fig. 18.) 
Iphthimus chevrolati, Hopfner, in litt. 
Black, shining. Head very finely and sparingly punctured, almost smooth; prothorax with a distinctly raised 
and reflexed margin, the sides feebly rounded and slightly sinuate in the middle and just before the base, 
the hind angles prominent and subacute (rarely obtuse), the anterior angles rounded, base strongly 
bisinuate, very finely, shallowly, and diffusely punctured, the disc slightly raised in the middle in front 
elytra crenate-striate, interstices convex, smooth ; ventral segments at the sides and the last ventral seg- 
ment at the apex distinctly margined within. 
Length 20-22 millim. (¢ 2.) 
Hab. MExico (coll. F. Bates), Cordova (Sailé), Jalapa (Hoge); Brirish Honpuras (coll. 
F. Bates), Rio Sarstoon, Belize (Blancaneaux) ; GUATEMALA, Purula, Santa Rosa, Cerro 
Zunil, El Tumbador, San Joaquin in Vera Paz (Champion) ; Costa Rica (Van Patten). 
A common species in Mexico and Guatemala. In some examples, from Costa Rica, 
&c., the strize are more closely and finely crenate, the thorax narrower, and the posterior 
angles more obtuse than in others; intermediate forms, however, occur. 
HICETAON. 
Allied to @atus. The mentum similar, but slightly convex in the middle and rounded at the anterior angles ; 
inner lobe of the maxilla. unarmed ; mandibles truncate ; antennz as in @atus ; head long, broad in front, 
grooved behind the eyes; epistoma broad and short, sides of the front slightly divergent; eyes distant 
from the thorax, widely separate, transverse oval, moderately large and prominent; labrum prominent ; 
prothorax a little. broader than long, narrowly margined at the sides and base, rounded at the sides, 
narrowed at base and apex, the base feebly bisinuate ; scutellum, elytra, prosternum, and epipleure 
as in Gatus; femora and tibie distinctly and rather closely punctured ; anterior tibis unarmed in both 
sexes; tarsi beneath:and the apical half of the tibiee clothed -with falvous hair. 
