84 Journal New York Entomological Society. voL 



XVII. 



Less shining than the worker, finely and indistinctly punctate. 

 Pilosity and pubescence grayish, much shorter and sparser than in the worker 

 and female. 



Piceous ; head and in some specimens also the mandibles and clypeus black 

 gaster paler ; funiculi, tarsi, articulations of legs, genitalia and mouth-parts sordid 

 yellowish. Wings grayish hyaline, scarcely infuscated towards their bases ; veins 

 and stigma brown. 



Described from numerous specimens of all three phases taken by 

 myself early in July, 1903, from several colonies under stones in various 

 localities about Colorado Springs, Colorado (Pospect Lake, Roswell, 

 Broadmoor and Ute Pass). There is also in my collection a dealated 

 female taken at Pecos, New Mexico, by Professor T. D. A. Cockerell 

 " on a stone at edge of Pecos River, July 30." 



This species is most closely related to Z. (A.) interjectus yi2.yx, 

 but is much smaller in all its phases. The worker and female are 

 readily distinguished from those of Mayr's species by the much more 

 rectangular and elongate head, shorter antenral scapes, less glabrous 

 body and more abundant pile and pubescence. The male differs from 

 that of interjectus in having edentate mandibles, a much less swollen 

 first funicular joint, more finely punctate body, lighter color, less 

 infuscated wings and especially in its smaller size (the male of \71ter- 

 lectus measures nearly 4 mm.). 



7- Formica adamsi, new species. 



IVorker. — Length 3.5-5 mm. 



Allied to F. rufa L. Head, excluding the mandibles, nearly as broad as long 

 even in the smallest individuals, with straight posterior border, rounded posterior 

 corners and slightly but distinctly convex sides. Eyes large. Mandibles 7-8 toothed. 

 Clypeus prominently carinate, with broadly rounded anterior border, not produced in 

 the middle. Palpi of moderate length. Antennae slender; scapes nearly straight at 

 the base ; funicular joints all distinctly longer than broad, the basal somewhat more 

 slender and longer than the apical joints. Pro- and mesonotum moderately rounded 

 convex, the latter elliptical and nearly twice as long as broad, the former a little 

 broader than long. Epinotum with subequal base and declivity ; the former slightly 

 convex, the latter flattened or even slightly concave ; the two surfaces in profile pass- 

 ing into each other through a rounded angle. Petiole more than half as broad as the 

 epmotum, in profile with convex anterior and flattened posterior surface and sharp 

 upper border ; seen from behind the border is rounded and feebly or not at all pro- 

 duced upward in the middle. Gaster and legs of the usual configuration. 



Opaque throughout, only the mandibles, frontal area and sides of the clypeus 

 faintly shining or glossy. Mandibles finely and densely striated. Surface of body 

 densely and indistinctly shagreened. 



Hairs and pubescence pale yellow ; the latter covering the whole body and ap- 

 pendages, inconspicuous, except on the gaster, but even on this region not sufi^ciently 



