1915.] Wheeler, Additions to the Ant-Fauna of North America. 415 
Described from two workers taken by. Dr. J oe Bradley on the summit 
of Mt. Wilson, near Pasadena, California. This species may be mistaken 
for L. neomexicanus Wheeler, but it is smaller, the thorax is stouter and of a 
different shape, the epinotal spines are much shorter, the petiolar node more 
acute in profile and the postpetiole decidedly smaller. 
42, Leptothorax (Mychothorax) hirticornis formidolosus subsp. nov. 
Worker. Length: 2.5-2.75 mm. 
Agreeing with Emery’s description of the typical hirticornis, except in the follow- 
ing particulars: The spines of the epinotum are not compressed, the petiolar node is 
scarcely angular but rounded in profile, the color in mature specimens is darker, the 
body being brownish ferruginous, the upper surface of the head and the gaster, 
except the extreme base and tip of the latter, dark brown. The legs and antennal 
scapes are opaque and densely punctate like the thorax. The tips of the mandibles, 
the clypeus along the middle line and posteriorly and a short median line on the front 
are shining. The postpetiole is distinctly broader than long, trapezoidal, with its 
anterior broader than its posterior border and its sides straight. The gaster is 
regularly elongate elliptical, narrowed in front to its insertion on the postpetiole. 
Body, including the antennal scapes and legs covered with short clavate hairs as in 
the typical hirticornis. | : 
Female (ergatoid). Length: 2.8 mm. 
Closely resembling the worker, except in the structure of the thorax, which has 
the female arrangement of the sclerites, but is narrow and shows no traces of having 
borne wings. 
Described from five workers and a single ergatoid female taken by Prof. 
T. D. A. Cockerell on Flagstaff Mt., near Boulder, Colorado. These are 
evidently distinct from the typical hirticornis, but as I have seen no speci- 
mens of this form, I am unable to estimate the precise extent of the differ- 
ences. 
43. Xiphomyrmex spinosus hispidus subsp. nov. | 
Worker. Length: 3.5-3.8 mm. 
Differing from the worker of spinosus Pergande from the cape region of Lower 
California, in having the erect hairs on the head and thorax short, stiff and blunt, not 
longer than those on the gaster, and in the shape of the metasternal angle which is 
large, flat and rectangular in profile and not in the form of a pointed tooth. The 
hairs on the legs are coarse and suberect. The epinotal spines are distinctly shorter 
than their distance apart at the base. The posterior border of the head is distinctly 
excised and there is a faint transverse dorsal impression between the meso- and 
epinotum. The postpetiole is less than twice as broad as long and about half again 
as broad as the petiole, its upper surface is rather finely and vermiculately rugose. 
Only the anterior half of the first gastric segment is subopaque and finely striolate- 
shagreened. The antennal funiculi are not infuscated at their tips. 
