38 Journal New York Entomological Society, t^'o'- x>^ii. 



Ford's volume on the Formicida? in the " Biologia Centrali- 

 Americana." Hence it is not surprising that Mr. Mann's collection 

 should prove to be of unusual interest. All of the specimens were 

 taken at altitudes above 7,000 ft., as will be seen from the following 

 brief notes on the localities in which he collected: 



Pachuca. The capitol of the State of Hidalgo, at an altitude of 

 8,000 ft., situated among low hills, on the slopes of which, in the 

 immediate vicinity of the town, rnany specimens were taken. The 

 territory is arid, with abundant cacti; in the hollows there are many 

 pepper trees (Schinus molle). 



Guerrero Mill. This locality is cited for ants taken within a 

 radius of a couple of miles of an ore mill situated on the eastern slope 

 of the high mountain range east of Pachuca. The altitude of the 

 territory over which collections were made, varies from 8,500-9,000 

 ft. The country is wooded, with oaks and pines predominating. In 

 many of the deeper canyons moisture prevails throughout the year, 

 but the hillsides at times become very dry. 



San Miguel. This locality denotes a stretch of semi-plain country, 

 stretching from Yelasco (about two miles below Guerrero Mill and 

 at an altitude of about 8,000 ft.) to the eastward. The little village 

 of San Miguel at an altitude of about 7,000 ft. is approximately in the 

 center of the country in which the collections were made. In general 

 the land is rolling, with large, level, semi-arid tracts. A barranca 

 opens into the plain directly from the tropics of the " tierra caliente." 



The collection is very interesting in the following respects: 



I. Though made at rather high elevations, it comprises a long 

 series of new forms, c. g.. a new legionary ant (Eciton manni n, sp.), 

 a new Monomorium (M. cyancum n. subsp.), with metallic blue 

 workers, a new Phcidolc of the subgenus AUophcidoIc {Ph. ccntcatl 

 n. sp.), with polymorphic workers, a new Stcnamma {S. manni n. sp.), 

 closely allied to the other species of this genus, hitherto known only 

 from subboreal America and Eurasia, a new Mynnica (M. vicxicana 

 n. sp.), related to M. punctivcntris Roger of the Atlantic States and 

 M. sulcinodis Nyl. of Europe, a singular Lcptothorax (L. manni 

 n. sp.), two interesting Forniiccc (Formica subcyanea n. sp. and naluta 

 n. var.), a new amazon ant (Polycrgtis montcznma n. var.), a dark 

 variety of one of the honey ants {Myrmecocystus melanoticus n. sp.), 

 a new Lasius of the suhgcnns Acanthomyops (L. mcxicanus n. subsp.), 

 and a new Camponoius, C. pcllariiis n. sp. allied to C. chilcnsis. 



