168 



HYMENOPTERA. 



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

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

 taceous. 



Hab. Brazil (Rioj. (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- 

 tennje and legs paler than the liead. 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^ line. — Pale reddish-yellow, with 

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

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

 deeplv 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). 



