\i \\\ : LNTS 01 i in I in ISLANDS. 439 



third. Thorax robust, humeri obtusely angulate, gibbous at middle of 

 Mesothorax margined al Bides and posteriori} bj a Btrong elevated ridge, 

 which extends upward and backward and is strongly excised al middle. 

 MesoepinotaJ impression Btrong. Base of epinotum concave, a little shorter 

 than the declivity; Bpines as long aa declivity, straight, moderately divergent, 

 thick to apical fifth where they are obliquely truncate, with the tip acuminate. 

 Petiole elongate, gradually enlarging from base to the node, which, in profile is 

 twice as high as Long, and very strongly notched above al middle. Postpetiole 



more thaD twice ;is hroad :is petiole, broadest al middle, narrowed al -ides, 



with the latter produced as horizontal, lamellate, broad, and bluntly angulate 



teeth, dorsal surface narrowly rounded at middle, (iaster hroad and oval. 



Legs rat her slender. 



Fig. 15. — Phcidole (Electropheidole) rooscvelti Mann. Worker. 



Head (excepting occiput), thorax, petiole, and postpetiole moderately 

 shining, occiput, mandibles, and legs strongly shining. Mandibles coarsely 

 striate and punctate. Head with moderately strong carinae, which are 

 irregularly longitudinal on front and sides and reticulate and rugose on vertex 

 and occiput, with the intervening spaces on the latter regions rugose; scrobes 

 reticulately rugose. Thorax coarsely reticulate-rugose. Epinotum smooth. 

 Petiole finely and postpetiole more coarsely rugose-striate. First gastric 

 segment regularly and rather coarsely punctate. 



Fine, long, erect hairs abundant on head, thorax, and abdomen, sparser on 

 appendage-. 



Dark reddish brown to black, gaster darkest, legs lighter. 



Soldier. Length 2.50-2.75 mm. 



Head longer than broad, sides feebly convex, sides behind eyes, occipital 

 corners and border distinctly margined, the border narrowly concave at middle. 

 Mandibles elongate, their blades 7-dentate, the two apical teeth long and acute, 

 the others small, irregular, and widely separated. Clypeus convex, anterior 

 border nearly straight. Frontal carinae short, not extending to opposite 

 anterior border of eyes. Antennae slender, their scapes surpassing occipital 

 corners by more than one third their length; first funicular joint slightly 



