PHI DOLE. 225 



b' . Pro- and mesouotum not forming a single 

 convexiU' ; transverse mesonotal furrow and 

 ridge or carina, or at any rate the latter, 

 always present. 

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



tured P. yiietneri, 



b'~. Whole head sculptured. 

 «■'. Head below vertex vertically truncate, [cisperata, p. 247. 

 forming a fiat plane with the clypeus . . P. capdUni, var. 

 R Head below vertex normally developed, 



not truncate. fp. 057^ 



rt^. Mesonotum bidentate above P. rnuUidens, 



b*. Mesouotum not dentate above. 

 «'. Frontal grooves for reception of scape 

 of anteuufe obsolete. 

 a' \ Head including mandibles very large, 



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



pedicel united P. %m'ou(ihtoni^ 



h^. Head includiug mandibles smaller, 



distinctly shorter than thorax and [p. 248. 



pedicel united P. constancice, 



b'. Frontal grooves for reception of scape 

 of antennre distinct. 

 a'\ Length over 7 mm. Scape flattened . P. ruyosa, p. 249. 

 b''. Length under 6 mm. Scape cylin- 

 drical. 

 a'. Vertex of head with a transverse 

 impression, broad and very dis- 

 tinct. 

 «\ Abdomen finely striate at base [p. 251. 



only P. sulcaticeps, 



b^. Abdomen finely striate from end to 



end, opaque P. ijcends, p. 252 . 



V. 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. 257. 



and shining P. fossidata, 



b''. Abdomen entirely smooth and 

 shining. 

 a}^\ Medial portion of clypeus 

 smooth and shining. 

 «^'. Frontal grooves for reception 

 of scape not Avell-raarked, 

 coarsely longitudinally stri- 

 ate within ." P.fece, p. 200. 



i^^ Frontal grooves for reception 

 of scape more distinct, trneh' 



sculptured within '. P. roherti, ]i. 259. 



b^". Medial portion of clypeus 

 opaque, longitudinally striate. 

 «'\ Scape of antenui-B compara- 

 tively long, falling short of 

 a])ex of lateral lobe of head 



VOL. II. Q 



