HYMENOPTERA. 169 



26. ATTA NIGRIVENTRIS. B.M. 



Worker minor. Length 1 line. The head and thorax ferru- 

 ginous; the abdomen and legs black, entirely smooth and 

 shining ; the antennae fuscous ; the articulations of the legs and 

 the tarsi pale ferruginous. The thorax with a deep strangula- 

 tion between the meso- and metathorax, the latter with two 

 minute upright spines. 



Hab. Brazil (Rio). 



27. ATTA PILIVENTRIS. 



Female. Length 2} 2 lines. Black: the face anteriorly and 

 the mandibles ferruginous ; the apex of the nagellum and the 

 tarsi pale testaceous. Head the same width as the thorax, 

 slightly emarginate behind, and irregularly longitudinally striated. 

 Thorax : the disk very closely and finely striated ; the scutellum 

 smooth and shining ; the metathorax finely rugose. Abdomen 

 ovate, and covered with fine pale silky pubescence ; the head 

 and thorax slightly pubescent. 



Hab. Brazil (Tejuca). (Coll. Rev. Hamlet Clark.) 



28. ATTA FUMIPENNIS. B.M. 



Female. Length 3| lines. Pale ferruginous and opake, with 

 the scape, basal joints of the nagellum, and the legs pale ; the 

 apical joints of the antennae and the margins of the mandibles 

 dusky. The head and thorax very evenly and delicately striated ; 

 the wings smoky, palest at their base, with the nervures fuscous ; 

 the second and following segments of the abdomen shining. 



Worker. Length Inline. Pale rufo-testaceous, not shining : 

 head oblong-ovate, with the mandibles bent, and very acute at 

 their apex, their inner margin furnished with acute teeth ; the 

 thorax narrowed, and nearly parallel behind the prothorax ; the 

 metathorax armed with two upright acute spines. Abdomen 

 ovate, truncate at the base, and more or less fuscous at the apex. 



Hab. Rio. (Coll. Rev. Hamlet Clark.) 



29. ATTA BISPINOSA. 



Atta bispinosa, Spin. Faun. Chili, vi. 244 . 

 Hab. Chili. 



Species of Mexico and Georgia. Sp. 30,31. 



30. ATTA CLYPEATA. B.M. 

 Female. Length 3 lines. Rufo-ferruginous, shining, and 



