of some Species of Brazilian Ants. 163 



Sp. 4. Ec'iton rapax, n. s. 



Worker. — Length A\ lines. The head, thorax and legs of an 

 opaque black ; seven or eight of the apical joints of the flagellum 

 fulvous beneath; the head and mandibles as in E. curvidenlala ; 

 the edges of the cavity for the reception of the antennsje rather 

 more raised at the sides ; the metathorax armed with two acute 

 spines ; the articulations of the legs, the apex of the tibias and 

 tips of the joints of tarsi, ferruginous ; the first node of the abdo- 

 men having beneath a small spine curved backward : the abdo- 

 men reddish-yellow, thinly sprinkled with pale pubescence ; the 

 legs, head, thorax and antennae sprinkled with black hairs. 



Worker (minor). — Very closely resembling the larger worker ; 

 the flagellum has more of the fulvous colouring ; the tip of the 

 scape, the anterior margin of the face and inner edge of the man- 

 dibles, more or less ferruginous ; the legs rufo-fuscous, with their 

 articulations as well as the tarsi ferruginous ; the metathorax 

 without spines, but having two longijtudinal carina^, not produced 

 at their termination. The first node of the abdomen armed 

 beneath, as in the larger worker ; there is also a minute tooth 

 at the base of the second node, pointing forwards ; abdomen 

 reddish yellow. 



This species was found by Mr. Bates at Para, and also at 

 Santarem ; I have not been able to find any description of it, and 

 believe it to be a new species. It is found in the virgin forests of 

 Brazil, as observed by Mr. Bates, not in open sandy situations 

 like most of the other species. 



Sp. 5. Eciton crassicornts, n. s. 

 Worker. — Dark reddish brown ; the head, thorax and legs 

 opaque ; antennae short and thickened ; the scape clavate, the 

 flagellum having the joints short, the apical ones being broader 

 than long, and fulvous beneath : mandibles black, short, stout 

 and longitudinally strigose, the inner margin of the apical dilata- 

 tion quadridentate ; the head wider than the thorax, and deeply 

 emarginate behind ; the lateral angles acute, scarcely dentate ; the 

 metathorax has on each side, near its base, a minute tubercle, and 

 is produced and emarginate behind : the legs shorter and stouter 

 than in the foregoing species, their articulations bright ferru- 

 ginous. The basal node of the abdomen has an elevated central 

 carina, acute at its apex, the second node unarmed ; the abdomen 

 thinly covered with short yellow pubescence, the other parts very 

 thinly sprinkled with short erect pale hairs. 



M 2 



