of the Amazon Valley. 431 



2. Trachyderes Reichei. 



Dupont, Mag. Zool. 1836, p. 31, pi. civ. ^ . 



Castaneus, glaber ; elytris fascia paulo ante medium, et 

 macula apicali triangulari ad anguluua suturalem., flavo- 

 testaceis ; thorace angulis posticis testaceis. 



cJ articulo basali antennarum maxime dilatato, 

 dififormi ; $ crasso, rotundato. 



Long. 10-16 lin. <^ $ . 



Also generally distributed throughout the Amazon 

 region. The thorax is of the same form as in T. succinc- 

 tus, and the colours of body and limbs offer no constant 

 difference. 



3. Trachyderes cingulatus. 



Klug, Nov. Act. Ac. Cffis. L. C. Nat. Cur. xii. 456. 



T. Reichei proximo affinis, differt colore purpurascenti- 

 nigro, elytrorum macula flava apicali elongata suturali 

 per marginem apicalem haud extensa; corpore subtus 

 omnino nigro-nitido. 



Long. 9-14 lin. ? . 



Sab. — Para. Four examples, all females ; quite dis- 

 tinct from T. Reichei. 



4. Trachyderes rhodopus, n. sp. 



T. succincto affinis, thorace elongation et angustiori, 

 dorso postice piano, lateribus antice (angulo antico ex- 

 cepto) haud tuberculatis ; fascia elytrorum longe ante 

 medium et antice in medio ad scutellum extensa ', corpore 

 subtus pedibusque rufisj elytris sparsim punctulatis, 

 apice breviter sinuato-truncatis ; antennis $ articulis 

 7-11 totis nigris, 7-10 valde abbreviatis, serratis. 



Long. 54 lin. ? . 



Hah. — Santarem. 



Apparently allied to T. ruhripes (Dupont), but dif- 

 fering from the description in several essential points. 

 By the form of the thorax it belongs to Dupont^s fifth 

 division, and not to the first, in which T. rubripes is lAaced. 



