712 Bulletin American Museum of Natural History. [Vol. XXIII, 



Mandibles subopaque, very finely and indistinctly striated. Body and appen- 

 dages opaque. Facial cavities granular; dorsal portions of head, mesonotum, 

 paraptera and scutelkun coarsely and reticulately rugose. Remainder of body 

 coarsely granular, the pronotum, pleurte and epinotum also more or less irregularly 

 rugulose. 



Hairs fulvous, similar to those of the female. 



Black or dark brown; mandibles, clypeus, anterior corners of head, funiculi, 

 thoracic sutures, tarsi, knees and tips of tibiae, genitalia and posterior and lateral 

 borders of the gastric segments fulvous. Wings blackish, with yellowish costal 

 cell and brown veins. 



Arizona: Palmerlee, Cochise County, Aug. 24 (C. Schaeffer). 



Described from a single female and six males. 



This species is clearly distinct though in certain respects it is intermediate 

 between T. sepfentrionalis and turrlfex. The female differs from that of 

 turrijex in the longer antennal scapes, which surpass the posterior corners 

 of the head, and the posteriorly excised postpetiole, and from both this and 

 septentrionalis in its much heavier sculpture, the greater size of the pronotal 

 spines and the shape of the gaster, which is not oblong and impressed in the 

 middle. 



8. Atta (Trachymyrmex) jamaicensis Em. Andre. 



Atta {Acromyrmex) jamaicensis Ern. Andre, Rev. d'Entom., Juillet, 1893, p. 149, 



Trachym-yrmex sharpii Forel, Trans. Ent. Soc. London, 1893, Pt. IV, Dec. pp. 372, 



373, 0. 

 Atta (Trachymyrmex) maritima Wheeler, Bull. Am. Mus. Nat. Hist., XXI, 1905, 



pp. 107-109, pi. vii, figs. 7 and 8, ^ . 



Worker. Length: 3.5-4.5 mm. 



Head, without the mandibles, as broad as long, somewhat broader behind than 

 in front, with obtusely excised posterior border, rather acute posterior angles and 

 slightly convex sides. Eyes somewhat flattened, in front of the middle of the head. 

 Clypeus with a small sinuate notch in the middle of its anterior border. Frontal 

 area triangular, indistinct. Frontal carinse with broad subtriangular lobes in front, 

 their surfaces not impressed in the middle, continued back as a pair of diverging 

 ridges to the posterior corners where they meet the postorbital ridges thus enclosing 

 elongated grooves for the antennal scapes. Vertex with a pair of blunt projections 

 and short rows of small tubercles. Each posterior corner of the head with three 

 short blunt spines at the angles of an equilateral triangle. Antennae slender, scapes 

 somewhat enlarged towards their tips which surpass by less than ^ their length the 

 posterior corners. Pronotum with a blunt, lappet-shaped inferior and a long pointed 

 superior spine on each side. In the middle between the two spines is a small double 

 tubercle. Mesonotmn with a pair of robust and rather blunt anterior and a pair of 

 small acute posterior spines. Mesoepinotal constriction long and rather shallow. 

 Epinottim with subequal base and declivity meeting almost at a right angle, the 



