of the Amazon Valley. 303 



3. Goutpsa quadri guttata. 



Ibidion quadriguttatum, White, Cat. Longic. Brit. Mus. 

 p. 226. 



Angustata, linearis, fulvo-testacea, capite thoraceque 

 griseo-tomentosis ; hoc cylindrico, paulo insequali, haud 

 tuberculoso, Isevi; elytris sinuato-truncatis et bispinosis, 

 nitidis, Isevibus, punctulis setiferis vix conspicuis, fulvis, 

 macula obliqua linear! laterali prope basin, alteraque simili 

 prope apicem nigris, testaceo-albo-marginatis. 



Long-. 4 lin. $ . 



Hah. — River Tapajos. 



Genus Heterachthes. 



Newman, Entom. i. 9. 



Compsa (part), Lacord.'Gen. viii. 333. 



Antennae and tibise free from carinas ; the femora are 

 clavate, and destitute of spines at the tip. Notwith- 

 standing these differences of structure, the species offer 

 no peculiarity of facies to distinguish them from Ibidion, 

 Gnomidolon, and other sub-divisions. 



1. HeteracJithes decipiens, n. sp. 



Elongatus, nigro-piceus, nitidus, setosus, antennis fe- 

 moribusque rufo-piceis ; thorace elongate, angusto, po- 

 lito, Igevi, dorso medio tuberculo magno conico ; elytris 

 bispinosis, spina suturali minori, supra (punctulis setiferis 

 exceptis) laevibus, macula laterali ante medium fasciaque 

 obliqua paulo post medium testaceo-flavis. 



Long. 4^ lin. c? ? • 



This species has a very close resemblance to Gnomidolon 

 vielanosomum {ante, p. 288) and the allied species, but 

 differs in the antennal joints being entirely free from 

 carinas in both sexes ; the third joint is perfectly cylin- 

 drical. In the $ , the third to the sixth joints are a little 

 stouter than in the $ ; in the femora, the club is dis- 

 tinct, but not abruptly foi'med, and the slight projections 

 at the apex are not sufficiently advanced or pointed to 

 be termed spines or teeth. 



Eab. — Ega. 



