March, 1914.] WhEELER: AnTS FROM HiDALGO, MeXICO. 57 



Described from several workers, a male and a female belonging 

 to a single colony which was taken at Pachuca. The slaves in the 

 nest were Formica subcyanca Wheeler. 



33. Myrmecocystus mexicanus Wesmael var. melanoticus new var. 



Worker. — Differing from the typical mexicanus in color, the body being 

 deep fuscous, the gaster nearly black, the legs, antennae, mandibles, clypeus and 

 cheeks yellowish brown. 



Male. — Length 5.5 mm. 



Like the male of the var. hortideorum !McCook, but of a different color, 

 the body being black, the genitalia, antennae and legs deep fuscous or piceous. 

 The wings are longer (6.5 mm., those of Jwrtideornm are less than 6 mm.), 

 without a discal cell. 



Described from eight workers and a male taken at Pachuca. This 

 is a very distinct variety, as the worker is much darker in color than 

 in any of the other forms of mexicanus and therefore bears a super- 

 ficial resemblance to the following species. 



34. Myrmecocystus melliger Forel. 



Several rather small workers taken from small crater nests at 

 Pachuca either belong to the typical form of this species or to a 

 very closely related variety. 



35. Camponotus maculatus Fabricius subsp. picipes Olivier, 



Many workers, males and winged females from Pachuca, San 

 Miguel and Guerrero Mill, belonging to the common Mexican form of 

 this subspecies which was redescribed many years ago by Forel 

 (Bull. Soc. Vaud. So. Nat., XVI, 1879, p. 67). In the workers more 

 or less of the thoracic dorsum, especially in front, is dark brown or 

 blackish. The wings of the female are very long (15—16 mm.). Mr. 

 Mann informs me that this ant is very common throughout the 

 mountains of Hidalgo, nesting in the ground under stones, like other 

 races of maculatus. 



36. Camponotus maculatus subsp. picipes var. pudorosus new var. 



\\'orker major. — Length 6.5-7 mm. 



Dift'ering from the typical picipes in its smaller size, in sculpture and 

 coloration. The head is distinctly shining and much more finely and super- 

 ficially shagreened, and the dorsal surface of both the head and thorax is 

 paler in color. The base of the first gastric segment is yellow like the petiole 

 and legs. The tibiae of the latter are only a little darker than the femora and 

 therefore much paler than in picipes. The pilosity is like that of the sub- 

 specific type. 



