334 



maxillary palpi with 6, labial with 4 joints, the 4th joint of the 

 maxillary palpi a little longer than the 5th ; frontal area small, 

 subtriangular and distinct; antennal carinae wide apart, more 

 or less curved outwards, never laminate ; antennae 12-jointed, 

 springing from just behind the posterior margin of the clypeus ; 

 the scape and flagellum filiform, the latter not sensibly thickened 

 towards the apex ; eyes placed above the middle line of the head 

 and somewhat to the front, ocelli present ; head viewed from the 

 side strongly convex in front. Thorax a little narrower than the 

 head, the pro- and mesonotum rounded, convex ; the pro-meso- 

 and meso-metanotal sutures well-marked, the thorax more or less 

 constricted at the latter suture ; legs moderately long and slight, 

 claws simple. Pedicel one-jointed, with an erect squamiforin 

 node ; abdomen comparatively short, globose. 



$ . Similar to the $ , larger ; wings ample, the fore wing with 

 one cubital and one discoidal cell. 



c? . Mandibles flat, the masticatory margin distinct, ending in 

 one to four or five teeth ; the palpi and clypeus as in the ; the 

 antennal carinso short, divergent posteriorly ; the frontal area as 

 in the ; the antennae 13-jointed, springing as in the from 

 just behind the posterior margin of the clypeus. Thorax massive, 

 broad in the middle, the mesonotum ample and convex, the 

 scutellum broad and prominent ; wings as in the $ . Node of the 

 pedicel rather low, cuneiform and square, above generally emar- 

 ginate ; abdomen above depressed, somewhat flat, the apical 

 segments gradually smaller. Pencilli present, outer genital laminae 

 knife-shaped, inner without appendix. 



Key to the Species. 



(i. Anterior border of clypeus not emarginate. 

 '. Fuscous or brownish red, head darker than 



rest of body. 

 a 2 . Abdomen opaque, not shining ........ I.fusca, p. 336. 



b z . Abdomen polished and shining ........ F. c/ayates, p. 336. 



V. Head and thorax clear yellowish red ; ab- 



domen light fuscous brown. 

 a 2 . Node of pedicel lightly but distinctly 

 convex in front, flat or concave pos- 

 teriorly .......................... p. trundcola, p. 334. 



6 2 . Node of pedicel flat or a little convex, 



both anteriorly and posteriorly ...... F. rufbarbis, p. 335. 



b. Anterior border of clypeus emarginate ...... F. sanguined, p. 336. 



382. Formica truncicola, Nyl. Ada Sc. lennic. ii (2), 1847, p. 907, $ $ ; 

 Forel, Jour. Bomb. N. H. Soc. viii (1894), p. 402, $ . 



% . Head with the mandibles and antennas, thorax, legs and 

 node of pedicel clear light or yellowish red, abdomen fuscous brown ; 

 head, thorax and abdomen covered with short erect light-red 

 hairs, sparse on the head and thorax, fairly abundant on the 

 abdomen, and a fine minute pubescence, giving the insect a silky 



