1907.] Wheeler, Fungus-growing Ants of North America. 705 



Ferruginous brown; upper surface of head, mesonotum and gaster blackish, 

 the mesonotum with a V-shaped red spot on the middle and the gaster with a pair 

 of elliptical ferruginous spots on the basal segment. Wings opaque yellowish 

 brown, with dull yellow veins. 



Male. (PL L, Fig. 26.) Length: 8 mm. 



Head, without the mandibles and eyes, as long as broad, subrectangular, with 

 nearly straight posterior border. Eyes large, protruding, hemispherical, with their 

 posterior orbits at the middle of the head. Mandibles well-developed, acute, flat- 

 tened and multidentate. Clypeus very faintly and sinuately excised in the middle. 

 Frontal and lateral carinte without teeth. Antennal scapes extending fully J their 

 length beyond the posterior corners of the head. The latter with a small, acute 

 superior and a broad flattened inferior tooth on each side. Pronotum with a 

 larger inferior and much smaller superior tooth on each side. Mesonotum with 

 distinct Mayrian furrows. Scutellum with a median longitudinal depression and 

 a pair of blunt posterior teeth. Epinotum with short, convex base and longer 

 straight declivity; spines like those of the female but more slender and tapering 

 more gradually. Petiole and postpetiole like those of the female, the former with 

 small acute teeth above and three lateral teeth, the latter with four teeth on each 

 side. Gaster broadly elliptical, with the basal segment flattened above and without 

 tubercles. Genital appendages convex, curved inward, with broad, rounded, sub- 

 truncate tips. Legs slender. 



Body including the mandibles and legs, opaque; gaster slightly shining. IMan- 

 dibles finely striated and coarsely punctate. Head, thorax and pedicel densely rugu- 

 lose, the rugulae being longitudinal on the head, mesonotum, scutellum, pleurae and 

 epinotum, and transverse on the pronotum, petiole and postpetiole. Gaster and 

 legs densely punctate. Genital appendages with a few scattered foveolse. 



Pilosity like that of the worker and female. 



Black; mandibles, border of clypeus, frontal carinse, neck, antennae, coxse, 

 tibiae, tarsi and gaster ferruginous brown, posterior borders of gastric segments 

 and genitalia somewhat paler. Wings like those of the female. 



Arizona: Tucson (Fenner, Wheeler); Yucca (Wheeler). 



Mexico: Calamujuet, Lower California (Eisen and Haines); Sonora 

 (Coll. Am. Mus. Nat. Hist.). 



The t}'pes are from Calamujuet; the above description is drawn from 

 Tucson specimens. 



4. Atta (Moellerius) versicolor chisosensis subsp. nov. 



A number of workers taken by Judge O. W, Williams in the Chisos 

 Mountains of southwestern Texas, and a few workers taken by myself at 

 Terlingua in the same region, represent a distinct subspecies. 



They differ from the typical versicolor in their distinctly lighter and more 

 yellowish color, much less pronounced sculpture and in having only a few 

 (about 12) pointed tubercles on each side of the median ga-stric depression, 



[Sept., 1907.] 4ff 



