218 Journal New Y(-rk Entomological Society. [Voi.xviii. 



sinuate in the middle above. Gaster elongate elliptical. Legs rather long, 

 with stout femora. 



Surface shining, finely and densely shagreened, more coarsely on the 

 head and most superficially on the gaster, so that the head, especially in front, 

 is subopaque. In addition to this sculpture the upper surface of the head 

 is covered with small foveolae, or coarse punctures, which are most abundant 

 on the cheeks. Mandibles densely striatopunctate. Upper surface of pro- 

 and mesonotum covered with small, indistinct punctures. 



Hairs and pubescence pale, very sparse, the former long and erect, the 

 latter visible only on the cheeks, mandibles, antennae and gaster. Legs, except 

 for a few hairs at the tips of the femora, naked. 



Head, thorax and gaster black or piceous ; mandibles, antennte, borders 

 of the thoracic sclerites and sometimes the whole thorax darker or paler 

 chestnut brown. Legs brown or yellowish, sometimes variegated with fuscous. 

 Thin posterior borders of gastric segments yellow. 



Worker minor. — Length 4-6 mm. 



Differing from the worker major in the smaller head, relatively longer 

 antennae and blunter petiolar border. The head is more shining and the 

 foveolae on the cheeks are indistinct. The clypeus is more convex and carinate 

 or subcarinate in the middle. 



Female. — Length 9.5-10.5 mm. 



Resembling the worker major. Head broader than the thorax. Body 

 black ; mandibles, antennte and legs reddish brown ; wings rather strongly 

 suffused with yellowish-brown ; veins and stigma pale yellowish-brown. 



Male. — Length 6.5-7.5 nim. 



Head about as broad as long, with straight, subparallel cheeks and broader, 

 rounded postocular region. Anterior border of clypeus nearly straight, with- 

 out a median notch. Mandibles without large punctures. Body black, shining ; 

 antennal funiculi, mandibles, articulations of the thorax and legs reddish or 

 brownish. Pubescence very dilute and inconspicuous ; hairs long, sparse, almost 

 absent on the head and thorax, most abundant on the gaster. Wings like those 

 of the female. 



C. fallax is readily distinguished from our other species of 

 Camponotus by its smaller size and the distinct notch in the anterior 

 border of the clypeus in the worker and female phases. In the south- 

 western states there are several other species {sayi Emery, hyatti 

 Emery, tc.vanus Wheeler and schacffcri Wheeler) which are very 

 closely related to fallax, but differ in size or coloration or in the 

 structure of the thorax. Emery also enumerates as belonging to the 

 fallax group, C. teplcanus Pergande and nitidus Norton of Mexico; 

 the Mediterranean species sichcli Mayr, lateralis Oliv., gcstroi Emery, 

 univcrsitatis Forel and intcrjectus Mayr of Turkestan. 



The habits of the European fallax are described by Forel in his 

 "Fourmis de la Suisse " as follows : 



