520 MR. M, JACOBY ON NEW coLEOPTERA. [June 5, 



spots placed triangularly near the apex, and sometimes connected 

 with each other, and another round spot in the middle, near the 

 subsutural stripe. Entire underside and legs shining greenish black. 

 The abdominal segments punctate and thinly pubescent at their base. 



Length 4 lines, 



Hab. Costa Rica. 



Collection Jacoby. 



Gallerucid^. 

 Genus Monocesta, Clark. 



18. Monocesta dimidiata, sp. nov. 



Subelongate, ovate, much dilated posteriorly, anterior half reddish 

 brown, posterior black ; head sparingly and obsoletely striate, with 

 a distinct longitudinal impressed line through its entire length, and 

 a deep transverse groove between the eyes, brown, shining ; autennse 

 nearlv half the length of the body, black, with the exception of the 

 first joint, which is reddish fulvous ; thorax transverse, a little nar- 

 rowed in the middle, broadly emarginate near the anterior angles, 

 with a deep oblique depression on each side towards the middle, 

 shining reddish brown, closely but very obsoletely punctured, the 

 disk nearly smooth ; scutellum finely punctuate, very rounded at the 

 apex. Elytra greatly dilated almost from the base to behind their 

 middle, impressed below the shoulder near the lateral margin, and 

 narrowly margined, apex simple, extremely close and finely punc- 

 tured throughout, reddish brown at their anterior half, black from 

 there to the apex. Anterior part of the underside fulvous, part of 

 breast, entire abdominal segments and legs (with the exception of 

 the first two pairs of the anterior thighs, which are fulvous) black. 



Length 7 lines. 



Hab. Peru. 



In my collection. 



19. Monocesta nicaraguensis, sp. nov. 



Broadly ovate, rufo-fulvous, pubescent. Head and vertex im- 

 pressed with a longitudinal groove, minutely punctate and sparingly 

 pubescent, labrum and mandibulse darker; anteunse black. Thorax 

 much narrowed in the middle, the apex slightly wider tlian the 

 base and rounded ; surface irregularly and transversely impressed, 

 sparingly pubescent. Elytra broadly margined, much dilated pos- 

 teriorly, the punctuation scarcely visible, and covered everywhere 

 with rather long reddish brown hair. Body below, together with 

 the tibiae, fuscous, anterior pair of thighs fulvous. 



Length .5 lines. 



Hab. Choutales, Nicaragua. 



Collected by Mr. Janson. 



Among the posteriorly dilated species of this genus, the present 

 one will be recognized by the uniform coloration of the entire upper 

 surface, the rather long pubcscenre, and the colour of the antennae, 

 all of which aie exactly the same in all the specimens before me. 



