450 bulletin: museum of comparative zoology. 



whole of the head black, except the mandibles and a spot on the gula, 

 which are red. Pro- and mesonotum with a black spot as in pratensis. 

 Gaster black, with the base of the first segment reddish yellow. An- 

 tennae and legs brown. 



Female. Length 8.5-10 mm. 



Antennae shorter and thicker than in the worker. Head, excluding 

 the mandibles, a little broader than long. 



Body densely punctate, bead and thorax more coarsely, gaster more 

 finely; head and thorax opaque, except the mandibles, which are 

 coarsely striatopunctate. Clypeus delicately longitudinally striate. 

 Gaster somewhat shining. 



Pilosity pale, sparse, and somewhat longer, pubescence even sparser 

 and more indistinct than in the worker. 



Dark brown or black, mandibles except their borders, anterior 

 portion of pronotum, inferior pleurae, venter and base of first gastric 

 segment yellowish or reddish. Legs brown or blackish brown, coxae 

 reddish. Wings not infuscated but merely tinged with yellowish at 

 their bases. Veins and stigma brown. 



Male. Length 9-1 1 mm. 



Mandibles tridentate. Head very broad and shorter than in rufa 

 and sanguinea, eyes rather small, the antennae, and especially their 

 scapes, shorter and much thicker. Petiole high and rather compressed 

 anteroposteriorly, with a rounded superior border, which is scarcely 

 or not at all excised in the middle. 



Body, including the mandibles and frontal area, opaque; gaster 

 feebly glossy. 



Pilosity and pubescence grayish, the former sparse especially on the 

 head and gaster, most conspicuous on the thoracic dorsum, the pubes- 

 cence rather long and dense on the gaster. 



Body, legs, and antennae black; genital appendages with yellow 

 bases and black tips. Wings colorless. 



Siberia, from the middle and southern portions of the LTral Moun- 

 tains to Transbaikalia. 



The nests are described as similar to those of F. rufa and pratensis 

 and in the Ural Mountains are located on the summits and slopes of 

 hills which are overgrown with grass and scattered birches. The 

 pupae are said by Ruzsky not to be enclosed in cocoons. 



The species is easily recognized by the peculiar coloring and robust 

 antennae of all three phases. 



42. F. adelungi Forel. 



F. adelungi Forel, Ann. Mas. St. Petersbourg., 1904, 8, p. 384, d"; Ruzsky, 

 Formicar. Imper. Ross., 1905, p. 420, cf ; Emery, Deutsch. ent. zeitschr., 

 1909, p. 189, cf . 



