592 SEEKICOEMA. 



the centre at the base. The sutural stripe varies in width, it being broadly extended 

 in some specimens. 



CTESIBIUS. 



Head broad, vertical, produced in front, very deeply sunk into the prothorax, the eyes rounded, rather small, 

 and not entirely free ; labrum not visible ; mandibles very short and curved, the apices visible ; apical 

 joint of the maxillary palpi rather stout, subsecuriform, that of the labial palpi subtriangular ; antennae 

 very elongate, slender, joint 1 very stout, 2 short, shorter than 3, 3 shorter than 4, 4-11 long and 

 subequal ; prothorax short, completely margined at the sides ; scutellum small, transversely triangular ; 

 presternum moderately long before the coxae, extending broadly between them behind, the process 

 margined on either side between the coxae, and received by a broad deep notch in the mesosternum, the 

 latter horizontal ; anterior coxae oval, with large trochantin ; middle coxae widely separated, with small 

 trochantin ; posterior coxae separated by the intercoxal process of the abdomen, the coxal plates gradually 

 widened inwards ; ventral segments 1-4 short, 5 as long as 2-4 united : tarsi with joints 3 and 4 each 

 with two long lamellae, 4 very small, the claws simple. 



The single species belonging to this genus is metallic blue above, and it has entirely 

 the facies of a small Eumolpid. It differs from Artematopus and Carcinognathus * in 

 having the fifth ventral segment very largely developed, the third and fourth tarsal 

 joints only bilamellate (instead of joints 2-4), the apical joint of the maxillary palpi 

 stouter, and the prosternal process margined between the coxse only, the process not 

 separated anteriorly from the rest of the prosternum. The single specimen obtained 

 is in too fragile a condition to dissect the parts of the mouth. 



1. Ctesibius eumolpoides. (Tab. XXVI. figg. 7f; la, prosternum; lb, 

 abdomen.) 



Oblong-oval, rather convex, very shining ; metallic blue, the body beneath and the antennae and legs black, 

 the tips of the tarsi testaceous ; above very sparsely clothed with long, fine, erect, fuscous hairs, the fifth 

 ventral segment thickly, the rest of the under surface very sparsely, cinereo-pubescent. Head very 

 sparsely, the epistoma more thickly, punctate, the front broadly transversely depressed in the middle 

 above ; antennae about two-thirds the length of the body, with long projecting hairs. Prothorax strongly 

 transverse, bisinuate at the base, and truncate at the apex, transversely compressed at the sides in front 

 rapidly and obliquely narrowing from the basal third forwards, and also narrowed behind, the hind angles 

 acute ; the surface sparsely, finely punctate, the punctures very distinct. Elytra three and one-half times 

 the length of, and wider than, the prothorax, subparallel in their basal half and obliquely convero-ino- 

 behind, compressed at the sides below the shoulders, the humeri appearing swollen ; sparsely, rather 

 coarsely punctate, the punctures arranged in regular series towards the sides and base. Beneath sparsely, 

 rather coarsely punctate, the fifth ventral segment very densely, minutely punctate, the prosternum with 

 the space between the middle and the flanks rugulose. 



Length 3g, breadth 2 millim. 



Hab. Mexico {Salle). 



One example, its sex not ascertained. 



* Kirsch appears to have overlooked the appendiculate form of the claws in this monotypic genus. 



t In this figure the tarsi have been incorrectly drawn by our artist, the second joint not being lamellate. 



