StapJiylinidcp of the Amazon Valley. 139 



punctured. Elytra about as long a?, and a good deal broader 

 than the thorax, of a dull greenish colour, closely and 

 deeply punctured, the punctures bemg much finer than on 

 the head and thorax. Hind body not much narrowed at 

 the extremity, black, Avith the hind margin of the 6th and 

 the whole of the 7th segment bright yellow. It is very 

 finely and rather closely punctured. Legs pitchy black. 

 St. Paulo ; one specimen, $ . 



EuGASTUS, n. gen. 



Antennee sat longa?, filiformes, articulo ultimo apice 

 obliquo. 



Palpi filiformes, articulo ultimo prjecedente longiore. 



Thorax lineis lateralibus baud conjunctis, sine mem- 

 brana stigmatica. 



Abdomen segmentis 2 — 4 sine lineis transversis incur- 

 vatis ; segmentis 2 et 3 basi utrinque linea brevi obliqua 

 impressis. 



Tarsi intermedii et postici graciles, articulo primo 

 lineari, elongato. 



Labrum medio incisum. Mandibulaj breves. Palpi 

 maxillares articulo ultimo apice acuminato, labiales arti- 

 culo ultimo lineari. Pedes graciles. Habitu Staphylino 

 et Philontho quasi intermedium. 



Locus systematicus prope genus Philothalpurn. 



This genus is undoubtedly very close to Philothalpus , 

 but as Kraatz specially bases that genus on the curved 

 lines of the hind body, and as these insects do not exhibit 

 that character, and as they present a facies strikingly 

 peculiar, I have decided on giving a new generic name, 

 though with much hesitation. 



\. Eiiyastus bicolor, n. sp. Rufo-ferruglneus, elytris 

 cyaneo-nigris; abdomine minus nitido, segmentis 4—6 late 

 infuscatis, 7" apice fusco. Long. corp. 0^ lin.; lat. (ely- 

 trorum) 1 .', lin. 



Mas: tarsis anticis leviter dilatatis; abdomine segmento 

 7° ventrali margine apicali medio leviter emarginato. 



Narrow and elongate, the front parts dull, and only the 

 hind body somewhat shining. The anteimtB are rather 

 slender, not quite so long as head and thorax, scarcely 

 thicker towards the extremity. The three basal joints 

 reddish, the rest pitchy ; 3rd joint one and a half times 

 the length of the 2nd ; from 4 — 10 each is a little shorter 



