708 Bulletin American Museum of Natural History. [Vol. XXIII, 



latter segment without distinct tubercles. Gaster elliptical, convex above, the first 

 segment with smaller and more scattered tubercles than in the worker and female, 

 and without a median longitudinal impression. Outer genital appendages broad 

 and short, with rounded edges; median pair with straight, slender, pointed tips. 

 Hypopygiimi entire, with a laroad, rounded point in the middle. Legs long and 

 slender; terminal tarsal joint not enlarged. 



Opaque, mandibles and clypeus granular; head and thoracic dorsum coarsely, 

 pleurae, petiole and postpetiole more finely reticulate-rugose. Epinotum and gaster 

 finely reticulate or granular. Legs smoother and somewhat shining. 



Pilosity similar to that of the worker and female. 



Ferruginous brown; upper surface of head, thorax, pedicel and first gastric 

 segment more or less blackened; legs and posterior borders of gastric segments 

 yellowish; antennal scapes dark brown. Wings as in the female. 



Texas: Austin, Montopolis, Milano (Wheeler); Denton (W. H. Long); 

 Paris (Miss A. Rucker, C. T. Brues). 



Florida: (Mrs. Mary Treat, T. Pergande), Miami and Jacksonville 

 (Wheeler). 



District of Columbia: Washington (Pergande, Swingle). 



North Carolina: Black Mountain (Forel). 



New Jersey: Vineland (Mrs. Treat); Toms River (Morris, McCook); 

 Lakehurst (Wheeler, W. T. Davis); Lucaston (E. Daecke); Miltown 

 and Manusquam (Davis). 



I believe that Buckley's name tardigrada, which has been very generally 

 applied to this species, should be rejected and replaced by McCook's septen- 

 irionalis, first, because Buckley's description will apply equally well to this 

 or the following species or even to Mycetosoritis hartmanni, although his 

 account of the nests applies to none of these but rather to a small colony of 

 Atta texana; and second, although Forel wrote in 1884 that Mayr had in 

 his possession a type specimen of Buckley's tardigrada which made it possible 

 to refer Florida specimens received from Mrs. Treat to this species. Dr. 

 Mayr writes me (March 24, 1902); "Ich besitze von Atta (Trachymyrmex) 

 tardigrada keinen Buckley'schen Typus." There is no possible means of 

 ascertaining just what species Buckley described. McCook's description 

 is equally worthless, but his specimens were redescribed by Forel, so that 

 the name scptentrionalis must stand. The above description is drawn 

 from specimens taken early in May from a single colony at Montopolis, 

 near Austin, Texas. Forel regarded McCook's specimens as representing 

 a variety of the southern form, but Emery failed to distinguish any varietal 

 differences between southern and northern specimens. A number of workers 

 taken by me at Lakehurst, New Jersey are larger (3.4-3.6 mm.) than speci- 

 mens from Texas and Florida and are of a paler, more yellowish color with 

 a darker and more distinct gastric stripe. A dealated female from Lake- 



