168 HYMENOPTERA. 



shining; the antennae, articulations of the legs, and the tarsi, 

 pale ; wings hyaline and iridescent, with the nervures pale tes- 

 taceous. 



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



23. ATTA RUBRA. B.M. 

 Female. Length 4 lines. Deep reddish -brown : the legs 



paler than the body, with the femora blackish in the middle. 

 The head longitudinally striated, the mandibles smooth and 

 shining. Thorax : the disk very finely and regularly striated, 

 the scutellum shining, the metathorax armed with two short 

 acute spines. Abdomen elongate-ovate ; the basal segment 

 opake, the following smooth and shining, with their apical mar- 

 gins rufo-testaceous. 

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



24. ATTA TESTACEA. B.M. 

 Worker major. Length 2 lines. Rufo-testaceous : the head 



very large, the sides rounded, deeply emarginate behind, with a 

 central, deep, longitudinal channel extending to the clypeus; 

 the face anteriorly coarsely and irregularly striated; the an- 

 tennae and legs paler than the head. The thorax deeply stran- 

 gulated between the meso- and metathorax, the latter having 

 two minute upright acute spines. The abdomen ovate, with the 

 base truncate. 



Worker minor.- Length, a little over a line, of a slender form, 

 the head of the ordinary size, the antennae longer than in the 

 large worker; entirely smooth and shining, with the abdomen 

 dusky. 

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



25. ATTA DILIGENS. B.M. 

 Worker major. Length 1-J- line. Pale reddish-yellow, with 



the abdomen slightly fuscous, the head and thorax opake, the 

 abdomen shining. The head very large, the sides rounded, 

 deeply emarginate behind, with a central longitudinal channel 

 extending to the clypeus ; the latter, as well as the mandibles, 

 smooth and shining; the inner margin of the mandibles black. 

 The divisions between the pro-, meso- and metathorax strongly 

 marked, the latter with two short acute spines. 



Worker minor. About a line in length, slender, and having 

 the head of ordinary size ; the head and abdomen more or less 

 fuscous. 

 Hab. Brazil (Villa Nova). 



