1915.] Wheeler, Additions to the Ant-Fauna of North America. 391 
of Brazil and Costa Rica, triangulare Mayr of Uruguay and Argentina, and 
trigona Emery of Brazil) it is much smaller. In the structure of the man- 
dibles it is intermediate between these species and those of the subgenus 
Guamptogenys Mayr. 
5. Odontomachus hematoda coninodis subsp. nov. 
Worker. Length 6-8 mm. 
Related to the subsp. clarus Roger, but the head is narrower and the body averag- 
ing smaller. The petiolar node is conical and convex behind and not acuminate at 
the tip or produced into a spine as in the typical hematoda and the subsp. insularis 
Guérin. The head, thorax, petiole and appendages are even paler and more yellowish 
than in clarus and the gaster is brown or dark red, with pale tip and segmental 
margins. The sculpture of the head and thorax is finer than in clarus and the surface 
a little more shining. 
Female. Length 8-9 mm. 
Resembling the worker and having the petiole of the same shape, but the sculp- 
ture and color of the female clarus, the gaster being blackish and the remainder of 
the body more reddish than in the worker. Wings grayish hyaline, with yellowish 
veins and stigma. 
Described from one dedlated female and seventeen workers taken Nov. 
12-14 by myself in Hunter and Miller Cafions, Huachuca Mts., Arizona, 
at altitudes varying from 5000-7000 ft., and a single winged female taken 
during August by Mr. W. M. Mann in Ramsay Cafion, in the same mountain 
range. This subspecies, which forms small colonies and nests under stones, 
may be regarded as a depauperate desert mountain form derived from the 
subspecies clarus. 
6. Odontomachus hematoda desertorum subsp. nov. 
Worker. Length 9-10 mm. 
Larger and more robust than the subsp. clarus, the head and Phony more coarsely 
sculptured and decidedly more opaque, the whole body, except the gaster, of a deeper, 
richer red, the mandibles, antennz and legs scarcely paler, the gaster black, shining. 
The petiole differs. in shape from that of the preceding subspecies and from clarus in 
having.a rather long, gradually tapering and backwardly directed point. In profile 
both the anterior and posterior surfaces of the node, except very near its tip, are 
feebly convex. Pilosity and pubescence as in clarus. 
Described from nine workers taken in the dry arroyo back of the 
Carnegie Desert Laboratory, near Tucson, Arizona. They were running 
over the dry soil. I did not succeed in finding the nest. 
