126 



WiLMAM Morton Wheeler 



Color black; venter and legs brown. 



Described from two specimens imbedded in a single block (without 

 a number) in the Geolog. Inst. Koenigsberg Coll. The same block 

 contains also a fine worker of Leptothorax gracilis Mayr and several 

 stellate oak hairs. 



F. liorrida differs from f^ori in its small size and peculiar pilosity. 

 In these and other characters it is closely related to the recent cinerea 

 of Europe, and in having erect hairs on the antennal scapes is even 

 more like the Californian inlicornis Emery, which is, in my opinion, 

 merely a subspecies of cinerea. The eyes of horrida are naked, however, 

 as in the typical cinerea, and not hairy as in pilicornis. 



Formica phaethusttf sp. nov. 

 Worker (Fig. 60). Length 10 mm. 



Allied to F. rufa L. and differing from F. fiori in its larger size, 

 more robust stature, much shorter maxillary palpi, which reach back 

 only to about the middle of the gula instead of to or slightly beyond 

 the posterior border of the head, its more rounded and convex pro- and 

 mesonotum, less angular epinotum and much broader and anteroposteriorly 

 more compressed petiolar node, which has a convex anterior and 

 flat or slightly concave posterior surface and a sharp, broadly rounded 

 or straight and transverse superior border. The eyes are proportionally 



smaller and more nearly 

 circular than in /JoH, the 

 head is of much the same 

 shape, being longer than 

 broad, but the posterior 

 border is less convex and 

 nearly straight. The an- 

 terior border of the sharply 

 carinate clypeus is entire, 

 rounded and not project- 

 ing. The penultimate 

 joints of the funiculi are 

 a little shorter than in 

 iiori. The pilosity is very 

 different, consisting of 

 rather dense, long, deli- 

 cate hairs covering the gaster, pronotum, dorsal surface of the head and 

 coxae. Possibly other portions of the trunk bore such hairs. There are no 

 traces of erect hairs on the scapes or legs, except the row of bristles on 



Fig. 60. Formica phaethusa sp. nov. 

 a) Worker, K 1678; b) head of same from below. 



