180 



Psyche 



[December 



Replete. Length 7-10 mm. 



Like the ordinary worker, except in the great distention of the gaster and the 

 more brownish tint of the posterior portion of the head, thoracic dorsum and 

 gastric sclerites. 



Fig. L Repletes of Myrmecocystus mericaniis mojave Wheeler. (From a photo- 

 graph by Mrs. Elizabeth Grinnell). 



Female. Length 8-10 mm. Wings 12 mm. 



Differing from the female of hortl-deorum in the following characters: cheeks 

 somewhat more, eyes somewhat less convex. Petiole much more compressed 

 anteroposteriorly, with a sharper and much more deeply excised border. Body 

 dark brown; thorax and posterior portion of head nearly black; anterior half of 

 head, venter and thoracic sutures paler and more reddish; mandibles, except the 

 teeth, antenniB and legs yellow or pale brown. Stigma and veins of wings dark 

 brown. Erect hairs on the body and appendages somewhat more abundant 

 than in h or fi -dear inn. 



Male. Length 4-5 mm. 



Differing from the male of horti-deoriim in having the head broader, the man- 

 dibles shorter, with broader blades, and the head, thorax and gaster dark brown 

 or blackish, with the mandibles, antennal scapes, legs and genitalia somewhat 

 paler, the funiculi and tarsi yellowish. The erect hairs on the body are distinctly 

 longer, coarser and more abundant. 



