896 CALIFORNIA ACADEMY OF SCIENCES. 



bluntly rounded and provided in front of the middle with 

 a rounded, tubercular elevation. Meso-metanotal con- 

 striction deep, the metanotum concave along the middle; 

 the spines are reduced to short and flattened, bluntly tri- 

 angular teeth, a small tubercle in front of each tooth and 

 a tubercle above the coxse. First node, not counting the 

 pedicel, broader than long, more or less distinctly arcu- 

 ate in front, angulated posteriorly, with the upper sur- 

 face quite flat; second node transverse, narrowest in 

 front, and with a deep, posteriorly broadening channel 

 along- the middle. First abdominal segment with a de- 

 pressed median line, reaching to or beyond the middle. 



Face and clypeus sparsely but distinctly granulated, 

 rest of body opaque and sparsely covered with minute, 

 glistening, yellowish and appressed scale-like hairs, which 

 are most dense on the abdomen, legs and antenna. 



Color yellow or reddish-yellow; generally the clypeus 

 and a more or less well-defined, broader or narrower 

 stripe along the middle of the face, of a lighter or darker 

 brown; teeth of mandibles and eyes black. 



Seven specimens. Santiago Ixtquintla, Tepic. 



This species appears to be related to Cyj^. kirbyi and 

 niorschi, but differs apparently from both in some of the 

 characters mentioned. 



46. Atta laevigata (Smith) Mayr. 



(Ucodoma hevigaia Smith, Cat. Hym. lus. Brit. Mus., vi, 1858, p. 



182. 

 Atta sexdens var. Icevigata Mayr, Reise d. Novara, Zool. ii, 7, For- 



micidaj, 1865, p. 80. 



Numerous specimens. Tepic. 



47. Atta (Acromyrmex) saussurei Forel. 



Atta ( AcroTnyrmex ) tardigrada Buckley, st. saussu7'ei Forel, Biill. 

 Soc. Vaud. sc. uat. (2), xx, P. 91, 1884, p. 361. 



Many specimens. Tepic. 



