Mr. H.W. Bates on the Endomychidae of the Amazon Valley. 169 



Body beneath and legs rusty-red ; the under-margins of the elytra 

 thickly punctured, and in the dark varieties blue-black along the basal 

 half. 



This species was common at Ega. I have described it from three 

 male and four female examples, in the coloration of the elytra: 

 two of them belong to var. 1, two to var. 2, one to var. 3, and two 

 to var. 4 ; it was thus not possible to fix upon any of them as the 

 type of the species, describing the others as varieties. I have there- 

 fore comprehended them all in the specific definition. The species 

 seems to be allied to G. 4-maculatus of Gerstaecker. 



13. Corynomalus nigripennis, n. sp. 



C. rufus, antennis, articulis duobus basalibus exceptis, tibiisque nigris; 

 thorace apud medium fortiter rotunde ampliato, angulis posticis pro- 

 duces acutis, opaco ; elytris in femina postice ampliatis, punctatis, sub- 

 opacis, cseruleo-nigris, apicibus flavo-rufis. — Long. lin. 3| ( $ ). 



Rusty-red. Antennae with the third joint as long as the two following 

 united, the two basal joints red, the rest black, shining. Thorax before 

 the middle strongly widened, rounded and narrowed more gradually to 

 the tip, apical angles obtuse, hinder angles projecting, acute, opake. 

 Scutellum red. Elytra in female gradually widened from the shoulders 

 to two-thirds the length, then more quickly narrowed to the apex, the 

 convexity very gradual from the base, the highest part placed far 

 behind the middle ; the humeral callus narrow, prominent, bordered on 

 the inner side by an oblong fovea, thickly covered with moderate-sized 

 punctures, coriaceous, opake, except along the sutural margins, which 

 are slightly shining, dark bluish-black, apex alone edged with yellowish- 

 red. Beneath rusty-red, shining ; under-margins of the elytra bluish- 

 black ; legs red, the tibise, their tips excepted, black. 



One specimen, from St. Paulo. In the shape of the elytra this 

 species would come under the following subsection ; but I believe the 

 male, if it were known, would be similar in shape to that of G. an- 

 gulkollis, and therefore would belong to the present subdivision. 

 It so nearly resembles the dark female varieties of G. angulkollis 

 that I think it very likely to be a local variety of it. It requires, 

 however, a long list of specimens (at present wanting) to decide such 

 questions as these. 



b. Elytra in both sexes narrower at the base than in the middle. 



14. Corynomalus interruptus, Gerstaecker, Mon. p. 160. 



At Obydos, on the Guiana side of the Lower Amazon, in company 

 with C. cinctus. 



