18/6.] MR. M. JACOBY ON NEW COLEOPTKRA. 81/ 



distance from the base, and the sixth and seventh at a short distance 

 from the apes ; all the interstices between the ridges deeply im- 

 pressed with shining green punctures. Legs and tarsi brown. The 

 mesosternal process is much developed, slightly curved and pointed. 



Length 7 lines ; width 5 lines. 



Hab. Columbia. 



This beautiful insect was collected by Mr. Wallis, and is in the 

 collection of Dr. Baden, in Altona, and my own. 



Ensiforma, nov. gen. 



Elongate, parallel ; head small, perpendicular ; eyes convex, small ; 

 palpi clavate, with a short acute terminal joint ; antennae as long as 

 the body, with the first seven joints (the second excepted) slender, 

 elongate-triangular, the next three greatly widened at their apex and 

 broadly flattened, the terminal joint long, and pointed at the apex. 

 Thorax subquadrangular, narrowed towards the base, the angles 

 obtuse ; scutellum broad triangular. Elytra wider at the base than 

 the thorax, the sides parallel, punctate-rugose at the surface. Femora 

 and tibiae of equal length and size, the first but little widened in the 

 middle ; tarsi with the first joint as long as the two following joints 

 together ; claws bifid. 



Type Ensiforma ccerulea, sp. nov. 



This genus, which bears a close affinity to the genus Diabrotica, 

 will be easily distinguished from that and other genera by the ex- 

 treme length of the antennae and their flattened terminal joints. 



22. Ensiforma cerulea, n. sp. 



Elongate, parallel, dark blue above, fuscous below ; the head, 

 thorax, the scutellum, and legs flavous. Head transversely grooved, 

 between the eyes joined by a short longitudinal groove in the middle 

 of the face ; first four joints of antennae fuscous above, flavous beneath, 

 the other joints entirely dark brown ; eyes black. Thorax with the 

 anterior and posterior margins nearly straight, slightly narrowed from 

 behind the middle to the base, the angles obtuse ; above but little 

 convex, with two shallow depressions on the disk near the sides, 

 shining, together with the scutellum impunctate. Elytra a little 

 broader at the base than the thorax, distinctly margined from the 

 shoulder towards the apex ; closely punctate and partially transversely 

 rugose, of a dark bluish green colour surrounded at the sides by a 

 narrow light flavous margin, which widens a little at the extreme 

 apex ; another short streak of the same colour is situated on each 

 elytron between the shoulder and the scutellum. Underside, the 

 breast excepted, fuscous, as are also the fore legs and posterior 

 femora ; tibiae and tarsi of the last two pair of legs dark brown, 

 covered, as well as the whole underside, with yellowish and rather 

 long hair. 



Length 4 lines. 



Hab. Brazil. 



One specimen in my collection. 



