510 WHEELER. 



41. Leptothorax nigatulus var. mediorujus var. nov. 

 Worker. Length 2.5-3 mm. 



A little larger, much more coarsely sculptured and of a much deeper 

 color than the var. rorkercUi and the subsp. anncctcns. Upper surface 

 of head and gaster black; mandibles, clypeus, antennse, thorax, petiole, 

 postpetiole and a spot at the base of the first gastric segment ferrugi- 

 nous red; margins of gastric segments yellowish; legs yellowish brown, 

 the femora infuscated in the middle. Rugosity of head, thorax and 

 petiole coarse; head but slightly shining; thorax, petiole and post- 

 petiole opaque, densely punctate. Declivity of epinotum transversely 

 rugulose. Epinotal spines a little stouter but not more curved than in 

 the typical rugatuJus. 



Female. Length 3.5 mm. 



Decidedly larger than the female of corkerelli, with the body very 

 dark brown, the antennae, mandibles, legs and incisures of the gaster 

 light brown. Surface of head, thorax and pedicel quite as coarsely 

 sculptured as in the worker and much less shining than in cockerclH and 

 the typical rugatulvs. Wings whitish hyaline, with nearly colorless 

 veins and pale brown stigma. 



Described from many workers and three females from several colo- 

 nies found near Lake Tahoe, Cala. (Tallac, Glen Alpine) and about 

 Camp Curry in the Yosemite Valley. A series of workers and two 

 winged females taken by Prof. J. C. Bradley at Volcano Creek in 

 Southern California also belong to this form. 



42. LcpiotJiora.x rugatidits Emery subsp. anncdens Wheeler. 



The four cotype workers taken at Boulder by Rev. P. J. Schmitt 

 remain the only specimens I have seen of this form. 



43. Leptothorax nigatidus subsp. brunnescens subsp. nov. 

 Worker. Length 1.6-2 mm. 



Decidedly smaller than the preceding forms of the species and much 

 more feebly sculptured, so that the surface of the head, thorax and 

 pedicel is distinctly shining. The epinotal spines are shorter than 

 their distance apart at the base, very feebly curved and slightly 

 deflected at their tips. The postpetiole is nearly twice as broad as 

 long, with prominent, but rounded anterior corners. The petiolar 

 node seen from above is as broad as long, and as in the other forms 

 broader behind than in front. In the other forms the segment is 

 considerably longer. The color is dull yellowish brown, with the upper 

 surface of the head and gaster, the summits of the petiolar and post- 

 petiolar nodes and the middle portions of the femora darker brown. 



