of f]ie Amazon ValJcy. 305 



5. Heterachthes cegrotus, n. sp. 



Angustatus, linearis, pallide testa ceus, longe setosus ; 

 thorace supra quinque-tuberculato, argenteo-griseo to- 

 mentoso, nitidulo ; elytris apice oblique truncatis, angulis 

 haud productis, supra nitidis, passim baud profunde 

 punctatis et punctis setiferis conspersis, macula triangulari 

 communi basali alteraque simili subhumerali pallide 

 rufescentibus, fascia obliqua pone medium, altera recta 

 transversali prope apicem, apicibusque albo-testaceis ; 

 femoribus elongatis, gradatim sed distincte clavatis. 



Long. 4 lin. c?. 



Hab. — Ega. 



6. Heterachthes sylphis, n. sp. 



Gracilis, linearis, capite tlioraceque ang'ustioribus, 

 rufo-castaneus, nitidus ; capite fortiter punctate, tuberibus 

 antenniferis obtusis ; thorace angusto, elongate, vix in- 

 fequali, nitido, postice subtiliter punctulato ; elytris sub- 

 planis, apice oblique truncatis, angulis baud productis, 

 supra (punctulis paucis setiferis exceptis) laevibus, fascia 

 lata transversa recta ante medium alteraque simili apicali 

 flavo-testaceis ; antennis pallide rufo-testaceis, articulo 

 3io S incrassato; pedibus elongatis, femoribus clavatis 

 longissimis, posticis apicem elytrorum multo superan- 

 tibus. 



Long. 3^ lin. S • 



DiflFers wholly in facies from the majority of the genus 

 which have short femora. 



Hah. — River Tapajos. 



7. Heterachthes deliciolus, n. sp. 



Gracilis, linearis ; capite piceo-rufo, subnitido ; thorace 

 valde insequali, supra quinque-tuberoso, nigro-piceo, seri- 

 ceo-opaco, argenteo-tomentoso ; elytris apice sinuato- 

 truncatis, angulis paulo productis, supra (punctulis seti- 

 feris exceptis) Isevibus, nitidis, castaneis, macula magna 

 utrinque basali, fascia lata pone medium ad suturam 

 antice dilatata, apicibusque testaceo-albis, parte basali 

 pallide fulva; pedibus antennisque fulvis, femoribus 

 clavatis, modice elongatis. 



Long. 31 lin. ( ? ?) . 



Hob. — Obydos, Lower Amazons. 



