1921] Wheeler: Tachigalia Ants 157 



15. — Solenopsis helena Emery subsp. hermione subsp. nov. 

 Worke7\ Length 1.6-1.8 mm. 



Differing from the typical helena of Chile in its somewhat 

 greater size (helena measures 1.3-1.5 mm.), in having the head 

 slightly shorter, with more rounded sides, joints 2-7 of the 

 funiculus very slightly longer as compared with their width, so 

 that the club is shorter in proportion to the remainder of the 

 funiculus. The epinotum is evenly convex, without indications 

 of an angle between the base and declivity, and the summit of 

 the petiolar node is not so thick in profile. The eyes, which are 

 not figured or described by Emery for the type, are very small 

 and consist of only four ommatidia. 



Female. Length 3.3 mm. 



Differing from the typical helena in color, being yellow, 

 like the worker, instead of pale brown, with the ocellar triangle, 

 a broad dorsal band and a large ventral spot on each gastric 

 segment dark brown. Each of these spots and bands is emargi- 

 nate posteriorly. In old, dealated females the wing-insertions are 

 also dark brown. Wings gray, rather opaque, with distinct brown 

 veins and dark brown pterostigma. 



Described from numerous specimens taken from several 

 colonies found in the petioles of young Tachigalias along the 

 Cuyuni trail at Kartabo. It nests also in the hollow twigs of 

 various other plants. 



16. — Solenopsis helena subsp. ultrix subsp. nov. 



Worker. Length 1.6-1.8 mm. 



Of the same size as the preceding subspecies but differing 

 in having the head still broader in proportion to its length and 

 with more rounded sides and posterior corners, the posterior 

 margin straight or even slightly convex. The antennal scapes 

 are distinctly longer, attaining the posterior fourth of the dis- 

 tance between the eyes and posterior corners of the head. Color 

 pale piceous brown ; tarsi and funiculi, except the clubs, pale 

 whitish yellow; gaster dark brown, with the anterior and 

 posterior borders of the segments yellowish. 



