88 Journal New York Entomoogical Society. [Voi. xvii. 



portions of femora and tibipe brownish or reddish. The smallest workers have the 

 upper surface of the thorax, especially the pro- and mesonotum, somewhat infuscated. 

 Mandibular teeth black. 



Female. — Length 6.5-7 mm. 



Resembling the female of ciliata. Body shining throughout, very finely shagreened, 

 without pubescence. Hairs very long, yellow, curled or hooked at their tips, con- 

 fined to the clypeus, gasterand ventral surface of the petiole ; on the gaster appressed 

 and arranged in two rows near the posterior border of each segment. Body and 

 appendages yellow ; teeth of mandibles and anterior edge of clypeus black ; scutel- 

 lum, metanotum, an antero-median and two parapsidal blotches on the mesonotum, 

 anterior borders of cheeks and a narrow band parallel with the posterior edge of each 

 gastric segment, brown. Antennal funiculi infuscated towards their tips. Wings 

 grayish hyaline, with pale brown veins and darker brown stigma. 



Described from six mature and five callow females and eighteen 

 workers taken by myself from a single nest near Boulder, Colorado 

 (July 29, 1906). This species is, perhaps, a hybrid between F. areas 

 Wheeler and F. ciliata Mayr, but the worker differs from those of 

 both these species in the absence of hairs on the head, thorax and 

 petiole, and the female has much fewer hairs and these are confined to 

 the clypeus and abdomen. The hairs are very easily rubbed off in 

 both workers and females, but the long 'series of the former and the 

 callows of the latter show that they cannot be more abundant than 

 described above. The colony from which the specimens were taken 

 was very populous. Its nest resembled very closely those of ciliata, 

 comata and areas which I have examined in Colorado. It was under 

 several contiguous stones, banked with vegetable detritus and in the 

 immediate neighborhood of flourishing colonies of F. ciliata and mfa 

 obscuripes. 



10. Camponotus schaefferi, new species. 



\Vorkc7- 7najor. — Length 9-10 mm. 



Head convex above, flat below, as broad as long, narrower in front than behind, 

 with broadly and feebly excised posterior border and very copvex sides. Cheeks 

 with a transverse impression. Mandibles rather small, very convex, 5-6- toothed. 

 Clypeus subrectangular, ecarinate, flat, longer than broad, a ntOe broader in front 

 than behind, its anterior border with a small blunt tooth on each side and distinctly 

 excised in the middle. Antennal scapes reaching to the posterior corners of the 

 head, not compressed. Eyes rather large, flat, elliptical. Frontal area indistinct. 

 Vertex with a small pit in the position occupied by the anterior ocellus in the female, 

 and two smaller pits on each side further back. Thorax narrowed behind and 

 laterally compressed, its dorsum in profile rather evenly arcuate, with a distinct meta- 

 notal sclerite. Epinotum subrectangular in profile, with subequal base and declivity 

 separated by a rounded angle, the base being straight, the declivity slightly concave. 

 Petiole narrower than the epinotum, with well-developed node, which is erect, very 



