New Genera and Species of Ncolropical Curculionidae. 201 



costate in the apical half and 7 in the basal half only, the space 

 between these two and int. 3 deeply impressed, but interrupted in 

 the middle by a broad transverse ridge uniting ints. 3 and 6, the 

 sutnral area flattened ; the scales subcircular, the green ones larger 

 and overlapping; the setae minute and inconspicuous, except at 

 the apex where they form a short tuft, and on the pale dorsal stripe 

 where they are numerous, very broad, curved and scale-like. Legs 

 with dense dark grey scales and rather stout subrecumbent pale 

 setae ; the hind tibiae alone denticulate internally ; the second tarsal 

 joint slightly longer than broad. 

 Length, 10-12 mm. ; breadth, 3^-4 mm. 



Venezuela : Escorial, 10,000 ft. 

 Described frf)m four specimens. 



Genus Plococompsus, nov. 



This genus is proposed for a small homogeneous group 

 of species of Com/psus that are characterised especially 

 by the presence of postocular vibrissae on the prothorax. 

 Other characters are as follows : — Scrobes narrow, curved 

 downwards, but the upper edge attaining about the middle 

 of the eye, so that the scape at rest passes across the lower 

 half of the eye; the bare part of the scrobe not sharply 

 defined, but gradually clothed with scales behind ; cpistomal 

 setae very long and dense; scape not or only slightly 

 exceeding the eye, comparatively slender, clavate, squamose, 

 with the scales not overlapping; mentum with a group 

 of setae on each side ; insects with functional wings. 



Genotype, Comps-KS viridipcs Boh. 



Other described species referable to the genus are : — 

 Compsus euchloris Pasc. (1880), C. mirandus Pasc. (1880), 

 and C. crocsKS Faust (1892), and several apparently 

 undescribed species are also known to me. 



Owing to the presence of prothoracic vibrissae and the 

 downwardly curved scrobes some authors would place this 

 genus among the Tanymecides, but its obviously close 

 relationship to Ccmpsus renders such a course very unsatis- 

 factory. The difficulty really arises from the inadequate 

 definition of Lacordaire's distinction between the Brachy- 

 derine and Otiorrhynchine types of scrobe. In the Tany- 

 mecids and other true Brachyderines not only the lower, 

 but also the upper edge of the scrobe curves more or less 

 sharply downwards in front of the eye, so that the antenna 

 when in a position of complete rest within the scrobe passes 



