1912] Wheeler — Ants of the Genus Myrmecocystus Wesi7iael 175 



Sculpture and pUosity as in the worker major, except that the upper surface of 

 the head is less shining. 



Head and lower portions of mesopleurse and pronotum yellowish red; mandibles, 

 antennae and legs darker red; remainder of body dark brown. Mandibular teeth 

 black. Wings tinged with yellowish; veins dark brown, stigma paler. 



Male. Length 6.5 mm. 



Head, excluding the eyes, longer than broad, with very convex eyes and long, 

 slightly concave cheeks. Mandibles with an apical and a rather large, blunt basal 

 tooth. Antennae slender. Thorax robust. Petiole much compressed anteropos- 

 teriorly. Gaster narrow. Wings with well-developed discoidal cell. 



Body somewhat more shining than in the worker. Erect hairs whitish, as abun- 

 dant on the body, scapes and legs as in the worker; pubescence shorter and sparser. 



Black; mandibles, anterior border of clj'peus and genitalia reddish yellow; 

 thoracic sutures, antennae and legs brown. Wings whitish hyaline, with pale 

 brown veins and stigma. 



M. melliger orbiceps ^^^leele^. 



Texas: Victoria (J. D. Mitchell). 



Arizona: Miller and Garden Canyons, Huachuca Mts. (Wheeler) 



M. melliger lomaensis subsp. nov. 



Worker. Length 4.5-5.5 mm. 



Differing in the shape of the petiole and in color from the worker of the typical 

 form. The petiole is more wedge-shaped and compressed at the superior border. 

 Black; mandibles, cheeks, clj^peus, antennae and legs deep red. Body, and es- 

 pecially the head shining; pilosity and pubescence white, shorter and more dilute 

 than in the typical form and resembling the conditions in mimicus. 



Replete. Length 9-10 mm. 



Color, especially of the head and thorax, paler and more reddish throughout; 

 in other respects, except for the distention of the gaster, like the ordinary worker. 



Female. Length 8.5-9 mm. Wings 12 mm. 



Head with straight and less convex sides than in the female melliger, as long as 

 broad. Eyes more convex. Petiole cuneate in profile, with flat anterior and pos- 

 terior surfaces and rather sharp superior border, which is distinctly emarginate 

 in the middle. 



Sculpture, pilosity and pubescence as in the worker. 



Black; gula, corners of clypeus and mandibles, except the teeth, antenna! 

 scapes and legs dark reddish brown; median funicular joints sometimes paler and 

 more yellowish. Wings whitish hyaline; veins and stigma pale yellow; first 

 longitudinal vein blackish. 



Described from six workers, three repletes and two females 

 taken by Mr. Percy Leonard on Point Loma, near San Diego, Cal- 

 ifornia. 



