1921] Wheeler: Tachigalia Ants 147 



upper surface of the head. Except in size, this variety is not 

 very sharply marked off from the type. 



7. — Pseudomyrma 7naligna var. crucians var. nov. 



Worker. Length : 3-3.5 mm. 



Of the same size as the preceding variety but with a decided 

 tendency to melanism, the whole thorax, pedicel and gaster being 

 very dai'k brown or black in mature specimens. The middle of 

 the scapes is infuscated and there may be occasionally pale 

 markings on the node of the postpetiole and at the bases and 

 sides of the gastric segments. 



Subfamily Myrmicin^. 

 8. — Pheidole crampioni Wheeler subsp. petiolicola subsp. nov. 

 Soldier. Length: 2.3-2.6 mm. 



Decidedly smaller than the type, which measures 4 mm., 

 and differing as follows: head with the anterior corners even 

 more decidedly turned outward, anterior gular teeth more slender 

 and more acute; eyes slightly larger and distinctly convex (flat 

 in the type) ; antennss shorter, the tips of the scapes reaching 

 the lateral borders of the head two-fifths of their length from the 

 anterior corners (nearly half their length in the type) . Thorax 

 shorter and proportionally stouter; epinotal spines slightly 

 shorter; postpetiolar node hemispherical and evenly convex 

 above, without distinct anterior angles. Interrugal spaces on the 

 anterior portion of the head less distinctly reticulate, so that the 

 rugse seem to be sharper. Surface of the body smoother and 

 more shining. Pilosity quite as well developed as in the type. 

 Color more vivid but the dark and light areas distributed in the 

 same manner. Mandibles and clypeus red, with dark brown 

 borders; anterior two-thirds of head clear ivory yellow, with a 

 large elongate castaneous spot between the frontal carinje; pos- 

 terior two-thirds of head with a band extending forward on 

 each side to the eye; the thorax, petiole, postpetiole and gaster 

 rich castaneous, the first gastric segment, femora and pleurae 

 somewhat paler; frontal carinse, tibiae and antennze reddish; tarsi 

 yellowish. 



