HENRY J. FRANKLIN. 343 



distinctly longer than its width at the apex, about one-fourth as long 

 as the eye. Third and fifth antennal segments subequal in length, the 

 fourth shorter than either. 



Thorax. — Coloration much like that of the worker, but the dark 

 interalar band more indefinite, there being a slight mixture of yellow 

 hairs with the dark. 



Abdomen. — Dorsum: segment one pale yellow ; segments two and 

 three rather pale ferruginous-red ; segment four pale yellow, with some 

 dark hairs admixed in the middle ; segments five, six and seven dark, 

 but with some light hairs admixed. Venter clothed mostly with dirty 

 whitish pile. 



Wings. — Subhyaline. 



Legs. — Coxae, trochanters and femora with a large amount of pale 

 yellow pile ; fore and middle tibiae with considerable pale ferruginous 

 pile on their hind sides ; hind tibiae with outer faces convex and mostly 

 bare and their fringes pale ferruginous ; hind metatarsi with long pale 

 ferruginous hind fringes. 



Dimensions. — Length: queen, 16 mm. to 18 mm.; worker, 8 mm. 

 to 12 mm. ; male, about 12 mm. Spread of wings: queen, about 35 

 mm. ; worker, 20 mm. to 26 mm. ; male, about 26 mm. Width of 

 abdomen at second segment : queen, about 9 mm. ; worker, \\ mm. 

 to 7 mm. ; male, about 6| mm.. 



Habitat. — Aleutian Islands, Popoff Island, Koyukuk River, 

 Kukak Bay, Nualaska. Most of the specimens which I have 

 seen were collected by Prof. Trevor Kincaid on the Harri- 

 man Alaskan Expedition. One worker before me, which 

 seems to be a little aberrant in coloration, from Signuia, 

 Baffin Land (Schuchert and White), appears to belong to 

 this species. 



This species is very closely allied to sylvicola, but the faces 

 of all the castes have more yellow pile than does that species. 

 The queen of sylvicola has the metapleura yellow and the 

 mesopleura yellow to the bases of the legs, while the queen 

 of gelidus has the metapleura mostly dark and the yellow on 

 the mesopleura falling short of the bases of the legs. I have 

 been unable to find any difference in structure between the 

 two species and the differences in coloration are, after all, 

 slight and I think it probable that they will some day be 

 considered as mere color variants of the same species. 



TRANS. AM. ENT. SOC, XXXVIII. 



