508 WHEELER. 



throughout, hke the petiole and postpetiole. The punctures are 

 decidedly coarser than in this variety and the typical form. The tips 

 of the antennal scapes nearly reach the posterior corners of the head, 

 being separated from them only by a distance equal to the greatest 

 transverse diameter of the scape. 



Several workers found nesting under the edges of stones in dry places 

 in Tenaya Canyon, Yosemite Valley, Cala. 



33. Leptothorax nitens subsp. occidentalis "Wheeler. 

 Described from Friday Harbor, Washington. 



34. LeptotJiorax vieJanderi Wheeler. 



Taken on Moscow Mt., Idaho by Prof. A. L. Melander. 



35. Leptothorax furuncuhis Wheeler. 



Taken in Williams Canyon, near Manitou, Colo, at an altitude of 

 7500 ft. 



36. Leptothorax tricarinatus Emery. 



Described from a single worker specimen taken by Pergande at Hill 

 City, South Dakota. I have not been able to recognize it among 

 my specimens of Leptothorax.. 



37. Leptothorax nevadensis Wheeler. 



Described from King's Canyon, Ormsby County, Nevada, where it 

 was taken by Prof. C. F. Baker. This locality is on the eastern shore 

 of Lake Tahoe. 



38. Leptothorax nevadensis subsp. rudis subsp. nov. 

 Worker. Length 2.6-3.3 mm. 



Distinctly larger and more robust than the typical nevadensis and 

 much more coarsely sculptured. Funicular joints 2-8 distinctly 

 broader in proportion to their length. Head subopaque, finely and 

 densely longitudinally rugose, with punctate interrugal spaces and 

 sometimes with an interrupted shining median line. Frontal area 

 shining, very finely striated. Mandibles coarsely punctate, striated 

 at their bases. Thorax and petiole coarsely punctate-rugose, the rugae 

 on the pleurae and often also on the pro- and epinotum longitudinal, 

 on the mesonotum often vermiculate. Declivity of epinotum densely 

 punctate and as opaque as the remainder of the thorax (more shining 

 in the typical form). Postpetiole densely punctate and opaque. 

 The epinotal spines are much stouter and blunter, and the petiolar 



