1915.] Wheeler, Additions to the Ant-Fauna of North America. 419 
common T'apinoma sessile, and if we assume that’this ant has almost com- 
pletely outgrown the toleration of its parasite, we can understand why the 
latter is so very rare and local that it has never been taken except by Dr. 
Dimmock. : 
Subfamily CaAMPONOTINAE. 
48. Polyergus lucidus montivagus subsp. nov. . 
Worker. Differing from the typical lucidus of the Eastern States in the distinctly 
paler and more yellowish red color of the body, in not having the gaster infuscated at 
the tip, in the complete or nearly complete absence of erect hairs on the posterior 
corners of the head, the smaller number of hairs on the gula and the distinctly less 
shining surface of the head and thorax. 
Female. Colored like the worker and not like the female of lucidus, which has the 
head, thorax and petiole of a striking, dark fuscous red tint. The wings, too, are 
paler with paler veins and stigma and the surface of the body, especially of the head 
and thorax, is distinctly less glabrous and shining. Gaster decidedly larger and longer 
than in lucidus. 
Male. Differing from the male lucidus in the paler wings, which are whitish 
hyaline, with colorless veins and pale brown stigma, whereas in lucidus the wings are 
faintly brownish, with brown veins and blackish stigma. The border of the petiole 
seems to be somewhat more acute in profile and the whole node more compressed 
anteroposteriorly and even more deeply excised than in lucidus. The legs, antennal 
funiculi and gaster in many specimens are paler and more reddish. 
Described from numerous specimens of all three phases taken from 
several colonies in the cafions about Colorado City and Manitou, Colorado, 
The winged phases were taken July 11 to 15 and August 11 to 20. The 
slaves in all the colonies belonged to a form of Formica schaufussi Mayr 
near the variety incerta Emery, without erect hairs on the gula and petiolar 
border, but like the typical form in other respects, though somewhat smaller. 
The specimens of montivagus have been compared with large series of the 
true lucidus from many localities in the Eastern States and leave no doubt 
that the two forms represent distinct geographical races. 
49. Polyergus rufescens breviceps Hmery var. umbratus var. nov. 
Worker. Length: 6—5.7 mm. 
Differing from the typical breviceps of Colorado in its somewhat larger size and 
decidedly darker color, the whole body and appendages being uniformly rich, reddish 
brown. The head and mandibles are also smoother and more shining than in most 
specimens of breviceps. 
