wheeler: ants of the genus formica. 473 



on the thoracic dorsum, clypeus, front, vertex, posterior corners and 

 gular surface of head, but absent or very sparse on the cheeks, pleurae, 

 and coxae. They are prominent both on the flexor and extensor 

 surfaces of the legs. 



Head and thorax red. Gaster black. Even in the largest speci- 

 mens the mandibles, anterior border of clypeus and apical half of 

 funiculi are dark reddish brown; ocellar triangle, upper surface of pro- 

 and mesonotum, much of the upper surface of the petiole, legs and 

 coxae, except their articulations, mQfe or less blackened or infuscated. 

 Fore coxae largely red. Anal region yellowish. In the smallest 

 workers the infuscation is more extensive, involving the whole of the 

 posterior portion of the head and epinotum. 



Female. Length 4.5 mm. 



Resembling the worker in sculpture and pilosity. Head, thorax, 

 petiole, and legs yellowish or reddish brown. Tips of funiculi, scutel- 

 lum, metanotum, and gaster dark brown; mesonotum with three 

 elongate brown blotches. Wings gray, with brown veins and stigma. 



Host (Temporary). F.fusca var. subaenesccns. 



Type locality. — Michigan: Porcupine Mts. (O. McCreary). 



Massachusetts: East Holliston, Sherborn (A. P. Morse). 



This species, too, is very closely related to the typical F. microgyna, 

 but both the worker and female are much more densely and coarsely 

 pilose and the epinotum of the worker is peculiarly low and rounded. 

 The colony of this species found by Mr. Morse at Sherborn, Mass. 

 was apparently still mixed with workers of F. fusca var. subaenescens, 

 although it contained a few winged females of the parasitic species. 



60. F. ADAMSi Wheeler. 



F. adamsi Wheeler, Journ. N. Y. ent. soc, 1909, 17, p. 84, ^ ; Rept. Mich, 

 geol. survey for 1908, 1909, p. 326 ^ ; Ants, 1910, p. 570. 



Worker. Length 3.5-5 mm. Allied to F. rnicrogyna. Head, 

 excluding the mandibles, a little longer than broad, very nearly as 

 broad in front as behind, with straight sides and straight or slightly 

 concave posterior border. Eyes rather large. Mandibles 7-8 toothed. 

 Clypeus strongly 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 dis- 

 tinctly longer than broad, the basal somewhat more slender and longer 

 than the apical joints. Pro- and mesonotum moderately convex, 

 mesoepinotal constriction rather shallow, broad at the bottom, epino- 

 tum with subequal base and declivity, the former slightly convex, the 



