60 JouRXAL Xew York Entomological Society. [^'°1- xxii. 



The soldiers of the two subspecies and their varieties may be dis- 

 tinguished by means of the following table : 



1. Head of soldier cordate, narrowed anteriorly, with slightly concave cheeks 



and convex front; mandibles without a deep longitudinal impression 

 at the apex between the two teeth ; postpetiole fully twice as broad 



as long 2. 



Head of soldier less narrowed anteriorly and less convex in the frontal 

 region ; cheeks not concave ; mandibles with an elongate and rather 

 deep, longitudinal impression at the apex between the two teeth ; post- 

 petiole not twice as broad as long 4. 



2. Color pale brown or reddish, gaster shining; length 3.8-4.4 mm., 



Ph. vasliti Pergande. 

 Color darker ; gaster subopaque ; pilosity more abundant ; length 6-7 mm. 3. 



3. Gaster black, head and thorax often dark brown or blackish, 



var. acollnia var. nov. 

 Color somewhat lighter var. hirtula Forel. 



4. Color paler subsp. subdentata Pergande. 



Color darker var. arisonica Santschi. 



The synonomy and distribution of these forms is as follows: 



Pheidole vasliti Pergande, Proc. Cala. Acad. Sci. (2), V, 1895, p. 883, "^l?; 

 Forel, Biol. Ccntr. Amer., 1889—90, p. 65. 

 Ph. obtusospiiwsa Forel {nee Pergande) Ann. Soc. Ent. Bclg. XLV, 1901, 



p. 130. 

 Sierra San Lazaro, Lower California (Eisen and \^aslit). 



Ph. vasliti var. hirtula Forel, Biol. Centr. .\mer. 1889-90, p. 65, '^^ ; Ann. 

 Soc. Ent. Belg. XLV, 190 1, p. 130,"^ 5 ; Wheeler, ibid. p. 202, "^5. 



Durango (Brinkmann) ; Querctaro (Wheeler) ; Zapotlan, Jalisco 

 (C. H. T. Townsend). 



Ph. vasliti var. acolhua new var. 



State of Hidalgo (^^^ ]\I. ^lann) ; Saltillo and Guadalajara (J. F. 

 McClendon). 



Ph. vasliti subsp. subdentata Pergande. 



Ph. subdentata Pergande, Proc. Cala. .'\cad. Sci. (2) V, 1895, p. 888, §. 

 Ph. obtusospiuosa Pergande, Ibid. p. 889, "U. 



Tepic, Mexico (Eisen and \''aslit) ; Rio Santiago (J. F. Mc- 

 Clendon). 



Ph. vasliti subsp. subdentata var. arizonica Santschi. 



Ph. ariconica Santschi, Bull. Soc. Ent. Ttal. XLT. 1909, p. 3, "4. 



