146 [July. 



very elongate, occupying a space between tlie striae 5-9. Ventral segment 5 

 unimpressed, 6 narrow and partly exposed ; median lobe of aedeagus long, 

 twisted, divided towards the apex into two pieces — one, sinuous, bifid at the 

 tip, the other obliquely, angularly dilated, hooked at the tip, and armed with 

 two backwardly-directed teeth beneath. Anterior and intermediate legs simple 

 [posterior pair wanting]. 



Length 12, breadth S^V mm. 



TIah. : Amazons, Ega {H. W. Bates). 



One male. The almost impunctate, dull, alutaceous prothomx, the 

 limited number of setigerous impressions and the very elongate opaque 

 patch on the elytra, and the remarkable genital armatm'e, readily separate 

 D. olivacea from the other Amazonian species here described. 



7. — Disema 2^lic(itlUs, n. sp. 



(Plate II, fig. 6, antenna cJ.) 



S. Elongate, somewhat robust, moderately shining; piceuus, the pro- 

 thorax and elytra with a greenish lustre, the opaque lateral patch black; 

 clotlied, the legs included, with long, scattered, tine, bristly hairs. Eyes 

 extremely large, almost touching above and beneath. Antennae rather short, 

 stout, serrate, joint 11 nearly as long as 8-10 united, twisted, broad, sub- 

 cylindrical, concave along the inner face, the upper and lower edges of the 

 cavity folded inwards. Prothorax about as long as broad, a little wider than 

 the head, rounded at the sides anteriorly, slightly constricted before the pro- 

 minent raised basal margin ; impressed with scattered intermixed coarse and 

 fine punctures, canaliculate down the middle, and triangularly excavate at the 

 base. Elytra elongate, at the base barely twice the .width of the prothorax, 

 subparallel to beyond the middle, rounded at the apex ; finely crenato-striate, 

 the interstices feebly convex, each with a series of small, somewhat closely 

 placed tubercles, followed by a setigerous impression ; the depressed opaque 

 lateral patch very large, oblique, elongate. Beneath shining ; ventral seg- 

 ment 5 excavate down the middle, and emarginate at the apex. Legs very 

 long, rather stout ; anterior tibiae excavate above and twisted to about their 

 basal third, abruptly bowed and gradually widening outward thence to the 

 tip ; intermediate femora deeply sulcate beneath, and with the lower edge 

 expanded and membranous before the apex ; intermediate tibiae widened and 

 twisted, deeply excavate at the apex externally, with a membranous fulvous 

 border along their inner edge, and two long, curved, pencils of fulvous hair at 

 the tip ; posterior femora armed with a small tooth beyond the middle and 

 excavate thence to the base ; posterior tibiae strongly sinuate, pilose within ; 

 basal joint of posterior tarsi very elongate. 



Length 101, breadth Sj'^ mm. 



Hah. : Upper Amazons, Ega {H. W. Bates). 



One male, with extraordinary characters, the form of the eleventh 

 antennal joint in this sex suggesting that of the Indian Lacjrlocera 



