WHEELER, NORTH AMERICAN ANTS 301 



Brownish black... (41) fallax suMarbatus var. paucipilis Emery- 



52. Head blackish brown 53 



Head and thorax yellowish red (42) faUax discolor Emery. 



53. Thorax blackish (44) fallax discolor var. cnemidatus Emery. 



Thorax red (43) fallax discolor var. cUirithorax Emery. 



54. Thorax feebly and evenly arcuate above, without a distinct im- 



pression at the mesoepinotal suture ; border of truncated sur- 

 face 6f head sharp (54) abditus var. etiolatus Wheeler. 



Thorax, with a distinct impression at the mesoepinotal suture; 



border of truncated surface of head blunt 55 



55. Gaster entirely black (55) impressus Roger. 



Gaster banded with yellow at the base 56 



56. Thorax and posterior portion of head dark brown.. (56) pylartes 



Wheeler. 

 Head and thorax yellow (57) pylartes var. Iniiiteri var. nov. 



A. SUBGENUS CAMPONOTUS 



I. Maculatus Group 



1. Camponotus maculatus vicinus Mayr 



Caiiipo)iotus vicinus Mayr, Verb. zool. hot. Ges. Wien, XX. p. 940. ^, 1870; 

 FoREL. Bull. Soc. Yaud. Sci. Nat, (2) XVI, p. 60, t^ , 1879; Dalla Torre, 

 Cataloc. Hymen., YII. p. 257, 1893. 



C. sjjlvaticus var. vicinus Mayr, Verb. zool. bot. Ges. Wien, XXXVI, p. 422, 

 1886. 



C. maculatus subsp. vicinus Emery, Zool. .Jahrb. Abth. f. Syst, VII, p. 671, 

 5 5 , 1893 ; Forel. Biol. Ceutr. Amer., p. 131, 1899-1900. 



Worker major. Length, 11-13 mm. ; head. 3.7 x 3.5 mm. ; scape, 3.2 mm. ; 

 hind tibia, 3.3 mm. 



Head, excluding the mandibles, nearly as broad as long, broader behind than 

 in front, with feebly concave posterior and feebly convex lateral borders, con- 

 vex dorsal and flattened gular surfaces. Mandibles strong, convex, 6-7-toothed. 

 Clypeus carinate, its anterior border moderately pi'oduced in the form of a 

 broad flap-like lobe with rounded corners and crenate edge. Frontal carinte 

 lyrate. Eyes moderately large, flattened. Antennal scapes distinctly flattened 

 at the base and but slightly widened at their tips, which reach a short distance 

 beyond the posterior corners of the head. Thorax robust in front though 

 narrower than the head ; pro- and mesonotum slightly flattened ; meso- and 

 metapleural regions compressed ; in profile, the dorsum is evenly arched, the 

 epinotum with subequal base and declivity, forming at their juncture a 

 rounded, obtuse angle. Petiole with convex anterior and flattened posterior 

 surface and rather blunt border. Gaster of the usual shape. Legs long: 

 middle and hind tibife elliptical in cross-section, neither compressed nor 

 grooved. 



Mandibles and anterior borders of cheeks shining, the former very coarsely 

 striato-punctate ; head, thorax and gaster subopaque ; head densely shagreened 



