1-18 MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. [Feb. 5, 



this, and two transverse markings at the apex, and placed laterally, 

 is a distinct ^-shaped spot placed directly below the middle of each 

 elytron. Legs and apex of abdomen ferrugineous. 



Length 4^ lines. 



Hub. Costa Rica. 



Collection Jacoby. 



The absence of all smaller spots usually found in the species of 

 this genus, and the peculiar pattern of the elytral markings, as well 

 as the purplish hue of the latter, will distinguish this species from 

 others. 



Family Gallerucid^e. 

 Genus Diabrotica, Chevrol. 



10. Diabrotica sexpunctata, sp. nov. 



Elongate, subparallel, above dark brick-red, each elytron with 

 three black spots ; head flavous, front impressed with a short longi- 

 tudinal groove, which terminates in a deep fovea, between the eyes, 

 vertex very minutely punctured ; antennae more than half the length 

 of the body, very light testaceous ; thorax subquadrate, the lateral 

 margins bulging out slightly before the middle, with all the angles 

 obtuse, surface impunctate, but little convex, of a flavous colour, 

 stained with darker irregular patches ; scutellum smooth, triangular : 

 elytra wider at the base than the thorax, and increasing in width 

 towards the apex, distinctly margined at the sides, and closely punc- 

 tate, the interstices here and there subrugose ; they are of a brick- 

 red colour, with a small round spot on the shoulder, another below 

 the base near the sutural margin, and a third behind the middle 

 black. Underside blackish, finely yellowish- pubescent ; tibiae tes- 

 taceous ; claws darker. 



Length 5 lines. 



Hab. Volcano of Irazu, Costa Rica. 



This insect closely resembles in colouring the D. tripunctata of 

 Oliv., but differs in the want of the impression on the thorax, 

 besides the different shape of the elytral spots. 



11. Diabrotica ventricosa, sp. nov. 



Elongate-ovate, very convex and widened posteriorly, black ; head 

 and thorax ferrugineous ; elytra with two basal spots, a transverse 

 band in middle and another at the extreme apex flavous ; head finely 

 pnnctate, with two crescent-shaped elevations between the antennae ; 

 the latter very light testaceous, with the apical joints a little darker; 

 thorax subquadrate, very convex, theposterior margin sinuate in middle, 

 and the sides very deflexed near the posterior angles, disk obliquely 

 foveolate on each side, finely punctured everywhere ; scutellum 

 transversely impressed near the base, black ; elytra very swollen 

 posteriorly, and much widened from before the middle, distinctly 

 punctured, the punctuation partly arranged in striae, especially so 

 towards the apex, shining black ; a large round spot near the 

 scutellum, another small one directly below the humeral callus, a 



