PHIDOLE. 225 



V. Pro- and mesonotuin not forming a single 

 convexity; transverse mesonotal furrow and 

 ridge or carina, or at any rate the latter, 

 always present. 

 a 2 . Posterior third of head smooth, not sculp- [p. 245. 



tured P. nietneri, 



b~. Whole head sculptured. 



a j . Head below vertex vertically truncate, [asperata, p. 247. 

 forming a flat plane with the clypeus . . P. capellini, var. 

 b 3 . Head below vertex normally developed, 



not truncate. [p. 257. 



a 4 . Mesonotum bidentate above P. multidens, 



b 1 . Mesonotum not dentate above. 

 a*. Frontal grooves for reception of scape 



of antennae obsolete. 

 . Head including mandibles very large, 



as long as or longer than thorax and [p. 247. 



pedicel united P. wroughtoni, 



b 6 . Head including mandibles smaller, 



distinctly shorter than thorax and [p. 248. 



pedicel united P. constancies, 



5'. Frontal grooves for reception of scape 



of antenna? distinct. 



(i . Length over 7 mm. Scape flattened . P. ruyosa, p. 249. 

 b 6 . Length under mm. Scape cylin- 

 drical. 



a 1 . Vertex of head with a transverse 

 impression, broad and very dis- 

 tinct. 

 a*. Abdomen finely striate at base [p. 251. 



only -P- sulcaticeps, 



b~*. Abdomen finely striate from end to 



end, opaque P. yeensis, p. 252 . 



b 7 . Vertex of head not transversely im- 

 pressed, or at most with only a 

 slight transverse impression, 

 a". Pronotum convex, lateral tubercles 



quite or nearly obsolete. 

 ;) . Base of abdomen finely striate, 



remainder of abdomen smooth [p. 267. 



and shining P.fossidata, 



b n . Abdomen entirely smooth and 



shining. 

 a 10 . Medial portion of clypeus 



smooth and shining. 

 u . Frontal grooves for reception 

 of scape not well-marked, 

 coarsely longitudinally stri- 

 ate within P./f<*, p. 200. 



b 11 . Frontal grooves for reception 

 of scape more distinct, hnely 



sculptured within P. roberti, p. 259. 



b 10 . Medial portion of clypeus 

 opaque, longitudinally striate. 

 a 11 . Scape of antenme compara- 

 tively long, falling short of 

 apex of lateral lobe of head 

 VOL. IT. ^ 



