1880.] 255 



The markings of the elytra are more simple and sharply-defined 

 than in any other species : the white sutural vitta being compact, 

 except two emarginations near the scutellum, and the oblique fascia 

 extending from the margin near the shoulder to the mid-rib of the 

 elytra. The sutural vitta is, however, marked from the middle of the 

 elytra to the apex with a series of round dark spots, and similar spots 

 are seen on the fascia. 



6. D. PEINCEPS, n. sp. — Precedentiproxime affinis, at differt colore 

 nigerrimo, vitta suturali immaculata ; antennis nigerrimis articulis 

 4 — 10 hasi griseis. Long. Q\ — 8^ lin., ^ ? . 



Hab. : Pebas, Upper Amazons (Hauxwell). 



Yery closely allied to D. comes, having a similar ashy-white fore- 

 head and uninterrupted sutural vitta and oblique fascia. But the 

 colour in D. princeps is a deep black, richer and deeper even than in 

 D. spectalilis, which colour extends to the antennse and the legs, in 

 the latter of which only the tarsi and the extreme apex of the tibise 

 are of the usual fulvous hue. The sutural vitta is free from the dark 

 spots which mark its central part along great portions of its length 

 in D. comes. 



7. D. ANTENNATUS, Guerin, Verhandl. Zool. Yer. Wien, v, p. 599 

 (^Acanthoderes) . 



Hab. : Banks of the Napo. 



According to the description this species differs from D. comes 

 chiefly by wanting the sutural ashy vitta of the elytra, there being only 

 a large spot behind the scutellum. The oblique fascia is present, and 

 the velvety tomentum of the elytra is of a castaneous colour. 



8. D. QUADRiscoPULATUS, Thomsou, Physis, ii, p. 146. 

 Hab. : Gruatemala. 



This, and one or two other undescribed species, occurring in 

 Central America, differ from the typical forms in having a pencil of 

 hairs at the end of the 4th, as well as of the 3rd, antennal joint. They 

 differ also in other characters, and, according to Lacordaire, scarcely 

 belong to the genus. They are much smaller and less conspicuous 

 insects than the true Discopi. 



Bartholomew Road, Kentish Town, N.W. : 

 March, 1880. 



