StayhylbddcE of the Amazon Valley. 141 



portion recldisli ; tliey are densely and vatlier coarsely 

 punctured, the punctuation being- confluent and rough. 

 Hind body with the basal segments l)lackish, but their 

 hind portions tawny ; 5th segment entirely black ; 6th 

 black, but with the hind margin broadly and abruptly 

 yellowish ; 7th yellowish, with its hind margin black ; anal 

 styles black. Legs tawny yellow. 



A single female of this remarkable species was found by 

 Dr. Trail at Lages, near INIanaos, on the 5th January, 

 1875. A very mutilated individual of the same sex was 

 also sent by Mr. Bates, but without any indication of 

 locality. 



Ohs. — This species may be readily distinguished from 

 E. hicolor, by its larger size, broader form, and shorter- 

 jointed antenna?, as well as by the more densely punctured 

 elytra and hind body ; the two females have the front tarsi 

 distinctly dilated, but scarcely so broad as in E. hicolor, $ . 



ISANOPUS, n. gen. 



Antenna? tenues, elongata?. 



Palpi filiformes, elongati, niaxillares artlculo ultimo 

 pra^cedente duplo longiore. 



Thorax lineis lateralibus hand conjunctis, sine mem- 

 brand stigmatica. 



Abdomen segmentis 2 — 4 sine lineis incurvatis. 



Tarsi antici dilatati, intermedii et posteriores articulis 

 2 — 4 sublobatis. 



Labrum medio incisum. ISIandibulge breves, acuta ; 

 tibia? posteriores tarsis fere duplo longiores. 



Genus pra3cedenti aflfinis, ditfert palpis longioribus tar- 

 sorumque structura alia. 



The insect to which I apply this new name is remark- 

 able for the structure of the four posterior tarsi ; these 

 have joints 2—4 somewhat lobed and dilated, the dilatation 

 being chiefly on their inner sides, so that each of these 

 joints is unsymmetrical in shape. 



1. Isanopus tenuicornis, n. sp. Niger, nitidus, elytris 

 obscure cyaneis, antennis articulis 4 — 11 testaceis, abdo- 

 mine apice rufo-testaceo. Long. corp. 6 lin.; lat. (ely- 

 trorum) 1^ lin. 



Mas latet. 



Femina tarsis anticis dilatatis. 



About similar in size to Philonthus cribratus,, but less 



