380 Mr. W. F. Kiiby on a new 



the fifth 7-5, width 4 ; length of braehium 7, width 3 ; length 

 of hand 4'5, width 3-5 ; length of movable finger 8. 



Loc. Venezuela : Merida (type) and Pedregosa. 



In 1898 I received a dried female specimen of this species, 

 ticketed '' Merida/^ from Prof. Kraepelin. The material 

 was, however, not sufficient to base a species upon. Recently 

 the British Mixseum has acquired examples of both sexes 

 from that locality, as well as one from Pedregosa, which satis- 

 factorily establish the constancy of the characters. 



Lll. — Description of a neiv Genus and Species of Apterous 

 Locust from Ecuador. By W. F. KiRBY, F.L.S., F.E.S. 



Opaon, gen. nov. 



Head convex above, with a row of granulations running 

 from the occiput nearly to the inner edge of eacli eye ; eyes 

 separated by a space about equal to their width ; fastigiura 

 depressed, subtriangular, extending between the antennae 

 nearly to the length of the scape ; lower part of face falling 

 away obliquely behind the level of the eyes ; antennae with 

 thirteen joints of the flagellum remaining, which are not unlike 

 those of a Prionide beetle ; joints very thick, two or three 

 times as long as bread; pronotum as long as broad behind, 

 ^^here it is somewhat widened, transversely wrinkled, and 

 with two distinct transverse sutures, the first about the middle, 

 the second halfway between this and the extremity ; before 

 the middle are one or two shallow ones ; hinder edge with 

 a row of large rounded warts. Mesotliorax, metathorax, and 

 first segment of abdomen covered with larger and smaller warts, 

 and with an irregular carina, rising into an obtuse projection 

 behind each ; the meso- and metathorax contracted in the 

 middle, so as to leave wide interstices between, the centre of 

 which is blackish ; prosternal spine broad at base, conical and 

 rather pointed at tij) ; abdomen contracted in the middle, and 

 transversely wrinkled behind the first segment; legs rather 

 hairy, first two pairs short, front tibiae with no foramina, femora 

 and tibiffi of about equal length, nearly straight, tibiae with 

 some short spines towards the extremity beneath ; second joint 

 of tarsi distinctly shorter than the first, third considerably longer 

 than both the others together, smooth, widened towards the 



