MOUNT EOEAIMA IN BRITISH GUIANA. 75 



tooth about the middle. Labrum rather large, siibquadrate, rounded in front. Head 

 convex, deflexed, but in no way covered by the pronotum, parallel behind the eyes, 

 narrowed in front. Eyes rather prominent, coarsely facetted. Antennae placed a little 

 in front of the eyes, widely separated at their base, eleven-jointed, of moderate length, 

 of nearly equal thickness throughout, except the slender third joint; composed of 

 cylindrical joints, clothed with stiff pubescence ; the second joint globoss, the third joint 

 very narrow at the base, the following joints gradually narrower towards their bases. 

 Thorax strongly transverse, the side with a strong tooth-like prominence about the 

 middle. Scutellum triangular. Elytra broader than the broadest part of the thorax, 

 one-third broader than long, flattened dorsally; tlie surface uneven, irregularly 

 punctured. 



Prosternum much reduced, with a diamond-shaped process between tlie coxae, the 

 coxal cavity completely open posteriorly. 



Mesosternum slightly inclined, with a slight, sharply margined concavity in which the 

 prosternal process rests. 



Metasternum rather short ; the episterna broad, a little narrowed posteriorly. 

 Abdomen composed of five visible segments below. Anterior coxae strongly transverse ; 

 intermediate coxae globose ; posterior coxae very narrow externally, very Avide internally. 



Tibial spurs small but distinct. Tarsi five-jointed ; the basal joint nearly as long as 

 the two following taken together ; the fourth the broadest, concave above, so that it has 

 a tendency to be bilobed, clothed with soft pubescence below ; fifth jomt not very long, 

 with divaricating claws. 



1 have some doubt as to the affinities of this genus. The structure of the antennae 

 points to affinity with the Ptinidae, near Hedobla ; but the broader, flatter form, 

 the freely exposed head, the transverse anterior coxae, and internally dilated postei'ior 

 coxae would place it in the Dascillidte, where I now joropose to place it. No doubt the 

 Ptinidae and Dascillidae should be placed nearer together than is usual in collections. 



EXAGONTUS DENTICOLLIS, Sp. n. 



Elongato-oblongus, parum convexus, fusco-castaneus, sat nitidus, brevissime griseo- 

 pubescens ; capita nigrescente, crebre punctato ; thorace utrinque dente valido 

 instructo ; elytris crebre pmictatis, pube gisea A'ariegatis, impressionibus nonnuUis 

 notatis. 

 Long. 3i, lat. 2 mill. 



The antennae are modei'ately robust, the third joint more slender, the fourth to tenth 

 joints a little longer and broad, cylindrical, united to each other by their centres ; the 

 eleventh joint a little longer, elongate-oval. Apical joint of the maxillary paljji black. 

 The elytra are brown, closely punctured, with numerous lines of greyish-yellow 

 pubescence giving a mottled appearance. Each elytron has a large transverse imj^ression 

 below the scutellum, another about the middle, one below the shouldei' ; the surface of 

 the apical portion is uneven, and in certain positions three slight interrupted costae may 

 be traced. 



SECOND SERIES. — ZOOLOGY, VOL. VIII. 11 



