Sta])]iijUiiid(E of tJte Amazon Vullcij. 279 



punctiu'ed. Hind body much pointed towards tlie extre- 

 mitj, the basal segments densely, moderately coarsely, the 

 apical ones very finely punctured. Legs pale yellow. 

 Front tibire slightly dilated towards the apex, and dis- 

 tinctly bisinuate externally. On the underside of the head, 

 at the base of the mouth, are two peculiar fine tubercles. 



Tapajos ; five specimens. 



Obs. — This species varies much in colour, some indi- 

 viduals being nearly black, and others reddish or yellow. 



I have dissected the terminal segments of one of these 

 specimens, vn\\\ the hope of ascertaining it to be a male ; 

 but I am unable to say positively whether this is the case 

 or not ; for though I have found what may possibly be the 

 Eedeagus, yet it is so small and insignificant that I am by 

 no means sure it may not be merely a portion of some 

 dried internal tissue ; — this although I have examined it 

 with a very high power. 



7. JEchiaster muticus, n. sp.? Infuscato-rufescens, ely- 

 trorum fascia basali, antenuis pedibusque testaceis ; opacus, 

 dense punctatus ; capite angusto, vertice elongato, subtus 

 mutico ; thorace minus elongato, latins bisulcato. Long. 

 Corp. 2 lin. 



Tapajos ; two individuals. 



Obs. — These two specimens present no difference from 

 E. viamillatus, except the absence of the tubercles on the 

 underside of the head ; it is probable that this may be 

 merely a sexual character, the E. muticus being only the 

 other sex of ^. mamillatus, in which case the species may 

 bear the name E. mamillatus. 



8. Echiaster tibialis, n. sp. Rufus, opacus, dense 

 punctatus, pedibus testaceis ; capite elongato, postice 

 angustato ; thorace minus elongato, latins bisulcato ; 

 tibiis anterioribus extus dilatatis. Long. corp. If lin. 



AntenntB red, stout, as long as the head; joints 5 — 10 

 each transverse, and each slightly broader than its pre- 

 decessor; 11th joint short. Mandibles very slender, 

 rather short. Labrum distinctly quadridentate. Head 

 elongate, the sides narrowed, but not roimded fi.'om the 

 eyes to the neck ; the surface elevated in the middle, 

 densely and obscurely punctured, quite dull, reddish. 

 Thorax much narrower than the elytra, rather longer 

 than broad, the sides almost rounded ; the greatest width 



