228 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Several workers sent me by Rev. P. J. Schmitt, O.S.B., from Boulder, 

 Colo., agree very well with Emery's description. 



3b. Var. convivialis var. nov. 



Length of worker 2-2.5 mm.; of female 3 mm. Differs from the 

 typical canadensis and the preceding variety, in its small size and very 

 deep coloration. Head, thorax, abdomen, femora and tibiae black, 

 neck, ventral portions of pedicel, funiculus, trochanters, knees and tarsi 

 red or yellow. Epinotal spines short and blunt. Sculpturing of body 

 as rough as that of the typical canadensis. Color of the female deeper 

 than that of the worker, the shining region of the mesonotum is more 

 extensive than in the female of canadensis, and there is a large sliining 

 area devoid of sculpture in the middle of the scutellum. 



Type locality : Milwaukee, Wis. 



Additional localities: Colebrook, Conn.; top of Las Vegas Range 

 (11,000 feet), N. M. (T. D. A. Cockerell) ; Beulah, N. M. (F. W. P. Cock- 

 erell). 



This variety seems to have a pronounced tendency to symbiosis 

 with other species of Myrmicidae. The Milwaukee specimens were 

 found living in the bark of a stump in xenobiosis with Cremastogaster 

 lineolata Say. Those from the top of the Las Vegas Range were 

 taken by Prof. Cockerell in a nest of Myrmica brevinodis. The 

 Connecticut specimens appeared to be living in plesiobiosis with For- 

 7nica rufa subsp. difjicilis Emery. 



3c. Var. Kincaidi Pergande. 



L. Yankee Emery var. Kincaidi Pergande, Proceed. Wash. Acad. Sci.,Vol. II, 

 December 20, 1900, pp. 520, 521. ^ $ . 



"Female. — Length about 4 mm. 



"Head and thorax black, the abdomen dark-brown, with the pos- 

 terior edge of the segments brownish-yellow; antennae, mandibles and 

 legs yellowish-red, the neck and paler parts of the nodes of a darker 

 red; the fiagellum grows gradually darker toward the end, with the 

 last joint black; femora dark-brown, their base and apex yellowish-red; 

 teeth of mandibles black. Head finely striated, the striae most distinct 

 in front of the eyes and between the frontal carinae; the posterior 

 half of the head is finely and rather densely rugose or reticulate, the 

 clypeus is almost smooth and the mandibles striato-punctate ; pro- 

 notum and mesonotum quite coarsely rugose, the metanotum, scu- 

 tellum and upper surface of nodes finely, though rather indistinctly, 

 striated; declivity of the metathorax transversely striated. Abdomen 

 smooth. Erect hairs short, truncate and pale-yellowish, those of the 

 nodes and abdomen longest; there are also a few much finer, erect 

 . hairs on the femora. 



