MEXICAN FORMICID^E. 501 



Length, 4 mm. Head about as broad as long; eyes 

 larger, the antenna more slender, the clypeus shorter, 

 broader and more distinctly truncate in front than in the 

 worker. Thorax broader than the head and but slightly 

 convex above. Scutellum broader than long; the meta- 

 notum short, convex, with two more or less distinct foveae 

 near its anterior margin. Scale broader than in the 

 worker, its upper edge arcuate. Abdomen elongate 

 ovate. Legs stouter than in the worker. Erect hairs 

 rather short and fine, the appressed pubescence very 

 dense on the head and abdomen. 



Color of the head, antenna, mandibles, some parts of 

 the thorax and legs brownish - yellow; the rest dark 

 brownish. 



Wings wanting. 



Male: Length, 2.6 mm. Head slightly shorter and 

 the eyes larger and more projecting than in the worker. 

 Mandibles narrow and with but one tooth at the apex. 

 Metanotum not elevated or nodiform, gently sloping to- 

 wards the scale, with two, posteriorly uniting, median 

 carinae. Scale broader than in the worker, its apex ar- 

 cuate. Genital claspers long, slender, curved slightly 

 inward, and furnished with numerous rather long and 

 slender hairs. Wings brownish, the stigma and veins 

 darker. 



Erect hairs finer than in the worker, especially those of 

 the abdomen. Scape without erect hairs. Appressed 

 pubescence dense, particularly so on the head and thorax. 



Coloration as in the worker. 



Many workers, twenty males and two females. 



Tepic, Mexico; San Jose del Cabo and Sierra San 

 Lazaro, Cape Region, Lower California. 



