I905-J 



Wheeler, Ants of the Genus DoUchoderus. 



307 



distinctly emarginate and impressed in the middle. Antennal scape curved at 

 the base, its tip extending a distance equal to its own diameter beyond the 

 posterior comer of the head. Funicular joints all distinctly longer than broad; 

 two basal longer than the succeeding joints; first joint nearly i^ times as long 

 as the second; terminal joint somewhat longer than the two preceding joints 

 taken together. Thorax in profile with rounded promesonotal surfaces, the 

 former somewhat flattened behind; mesoepinotal constriction deep. Epino- 

 tum with convex basal surface, slightly flattened in the middle, nearly as long 

 as the mesonotum and suddenly passing by a sharp edge into the very concave 

 declivity. Seen from above the prothorax is robust ; the meso- and epinotum 

 much narrower and laterally compressed. The sharp margin between the two 

 epinotal surfaces is broadly rounded when seen from above and extends down - 

 ward on either side to the metasternal region. There is a distinct median keel 

 on the epinotal concavity. Petiole robust, as broad as the epinotum, but not 

 as high as the margin between the two epinotal surfaces, with shorter and more 

 convex anterior, and longer and flatter posterior surface; dorsal margin of 

 node blunt and, when seen from behind, straight and transverse. Gaster 

 broad, somewhat flattened above, first segment with a straight anterior border; 

 constriction between the first and second segments somewhat deeper than be- 

 tween the succeeding segments. 



Whole body smooth and shining. Mandibles with a few widely scattered, 

 coarse punctures. Clypeus with very fine longitudinal striae. Head, thorax, 

 and petiole finely reticu- 

 late, with shallow foveolae, 

 most distinct on the pos- 

 terior portion of the head 

 and on the meso- and 

 epinotum, but especially 

 on the last. Epinotal 

 concavity shining, longi- 

 tudinally striated. Gaster 

 and legs very finely reticu- 

 late, more glabrous than 

 the other portions of the 

 body except the mandibles. 



Body naked, except for a few yellowish hairs on the clypeus, mandibles, 

 lower surface and tip of gaster, coxae, and flexor surfaces of the femora. Pubes- 

 cence pale, very sparse and indistinct except on the gaster, cheeks, and antennal 

 funiculi. 



Yellowish blood-red, terminal half of antennal funiculi black. Gaster 

 black, with the anterior half of the first and a rather square blotch on either 

 side of the second segment near its anterior border, yellow. 



DoUchoderus 7naria Forel. Worker. 



Female. — Length 4-4.5 mm. 



Differs from the worker in the following characters: Clypeus convex, with 

 a very distinct median notch. Eyes larger, ocelli present. Epinotum with 

 convex, evenly rounded basal surface, passing into the concave surface 

 through a rounded angle; both surfaces of equal length. Head, thorax, and 

 petiole much smoother, quite as glabrous as the gaster. Epinotum above with 



