156 Zoologica: N. Y. Zoological Society [HI; 4 



declivity which is abrupt and distinctly marginate on the sides. 

 Petiole in profile very large, with distinct peduncle and longer 

 abrupt node, which is much higher than the epinotum, higher 

 than long, in profile subrectangular, with vertical anterior and 

 posterior borders and subhorizontal superior outline rounded at 

 each end. The ventral surface is convex behind and concave in 

 front, with an angular projection but no distinct tooth near the 

 anterior end. Seen from above the petiole is twice as long as 

 broad, gradually enlarged behind, so that the node is seen to be 

 much compressed laterally. Postpetiole in profile much higher 

 than long, the summit of its node rounded, not attaining the 

 height of the petiole. From above the postpetiole is somewhat 

 broader than the petiole and slightly broader than long. Gaster 

 large, the anterior border of the first segment somewhat concave. 

 Sting long and powerful. Legs moderately long and slender. 



Smooth and shining, with minute, scattered, indistinct, 

 piligerous punctures ; cheeks and sides of front finely striate. 



Hairs pale yellowish, bristly, of uneven length, moderately 

 abundant, erect or suberect, rather long on the body, shorter on 

 the antennae and legs. 



Dull reddish brown ; head and especially the gaster dark 

 brown; mandibles, clypeus, cheeks, antennae and legs yellow; 

 middle portions of scapes, femora and tibiae more or less 

 infuscated. 



I have redescribed this species, originally described from 

 Venezuela and Trinidad, from many specimens taken at Kartabo. 

 It does not»live in the petioles of Tachigalia but in the ground 

 and often enters those inhabited by the Coccidotrophus and 

 Eunausihuis and desti'oys their colonies {vide supra p. 82) . I 

 was never able to secure the sexual forms and brood. The 

 worker is readily distinguished from the numerous other South 

 American species of Solenopsis by the peculiar, high, compressed 

 petiolar node, marginate and subbidentate epinotum, nearly 

 unarmed clypeus and unusual coloration. 



