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bulletin: museum of comparative zoology. 



the posterior corners stand out prominently, somewhat lobiform. Mandibles 

 thick, outer border straight at middle, blades edentate. Clypeus flat, concave 

 at anterior border, strongly carinate. Frontal area deeply impressed. Frontal 



Fig. 16. — Pheidolc isis Maim. Soldier. LatRral view of head, thorax, and petiole. 



lamellae flat, dilated; frontal carinac strong, expanded laterally, a little longer 

 than the scapes, and bordering a broad scrobe capable of containing the entire 

 scape (similar to cryptocera Emery). Antennae short, their scapes extending 

 less than half the distance to occipital corners; funicular joints two to eight 

 strongly transverse; club moderate, shorter than remainder of funiculus. 

 Eyes small (about fifteen facets) and convex, situated at sides of head well in 

 front of middle. Promesonotmn without suture, about as broad as long, sides 

 strongl}^ produced conically and ending in stout tri- 

 angular spines; sides of mesothorax obtusely angulate, 

 posterior portion perpendicular to the mesoepinotal 

 impression. Epinotum concave between the spines, 

 which are stout, about as long as their distance apart 

 at base and extending upward and backward and 

 slightly curved inwardly. Petiolar node in profile 

 cuneiform; above deeply emarginate with the sides 

 narrowly margined and obtusely angulate. Postpeti- 

 ole twice as broad as petiole, produced conically at 

 sides. Gaster short and broad. Legs rather slender. 

 Opaque. Mandibles punctate, shining. Clypeus 

 shining, finely striate. Front and cheeks subopaque 

 with coarse, very rugose striae and the intermedi- 

 ate spaces rugulose. Scrobes coarsely and granulosely punctate. Vertex 

 rugosely reticulate. Occipital region with rather regular reticulate striae 

 and the enclosed portions smooth and shining. Pronotum coarsely, reticu- 

 lately striate and rugose. Mesonotum more finely rugose, longitudinally striate 

 at sides. Epinotum with series of fine and short transverse striae. Petiole, 

 postpetiole, first gastric segment, and posterior portions of second and third 

 segments very densely punctate and opaque. 



Fig. 17. — Pheidole isis 

 Mann. Soldier. 

 Front view of head. 



