390 



PSYCHE. 



[September, 1902 



typical l>aii)a/!n\ the rugae being often 

 very coarse and irregular on the prono- 

 tum. Coarse hair covering the body 

 grayish white ; beard rather scanty and 

 almost absent in several of the speci- 

 mens. 



Described from 14 workers kindly 

 given me by Mr. A. M. Ferguson. They 

 were collected at Eagle Pass, Tex. by 

 a lady who found them carrying away 

 the buds of the singular gnetaceous 

 Ephedra aiitisypJiilitica. Two other 

 specimens which evidently represent a 

 transition to P. harbatus var. inarfcnsis 

 Wheeler were collected at Mesa Negra, 

 San Ildefonso, New Me.xico by Mr. E. L. 

 Hewitt and Miss Ruth Reynolds. In 

 these specimens the petiole and post- 

 petiole are red, the former being dis- 

 tinctly grooved longitudinally. The 

 beard is well developed, v 



The addition of the preceding variety 

 and two species to our fauna leads me 

 to revise my recently published table of 

 the North American Pogonomyrmcx* 

 A third species, P. schmitti from Hayti 

 has also been recently described by 

 Forel.t As this West Indian species, 

 the Texan imbcrbicitlns Wheeler and the 

 Brazilian niigcUi Forel form a compact 

 group of forms more closely related to 

 one another (in size, sculpture, absence 

 of beard, etc.) than to any other species 

 of the genus, they may be included 

 in a distinct subgenus for which I 

 would propose the name Ep/icbomyrmex. 



* Am. Natur. Vol XXXVI No. 422, 1902, pp. 97-99. 

 t Ann. See. Entomol. Belg. Tome XLV, 1901, pp. 339- 

 340. 



Pogonomyrmcx sc/isu Into would then 

 comprise the species of the genus prop- 

 er, the subgenus Janetia Forel (with the 

 single species /. mayri Forel from 

 Colombia) and the subgenus here pro- 

 posed. The workers of the nine known 

 North American species of Pogoiiomyrmex 

 may be distributed as follows : 

 *Sniall species, less than 5 mm. long ; 

 under surface of head without a beard of 

 long recurved hairs ; epinotum with four 

 spines ; head, thorax and petiole reticu- 

 late-rugose. {Ephcbomyrmcx, subgen. 

 nov.) 



1. Color red — iinhcrbiciilKS 

 Wheeler. 



2. Color black — sc/unittiYoreX. 

 *Large species, more than 5 mm. long ; 

 under surface of head with beard of long 

 recurved hairs; epinotum unarmed or with 

 only two spines ; head and thorax fine- 

 ly rugose, the rugae parallel and not dis- 

 tinctly reticulate. {Pogonomyrmcx s. str.) 



t Epinotum with a pair of spines. 

 § Posterior angles of head smooth 

 and shiniiig. Sculpture of head 

 and thorax very fine. c/cscr/onim, 

 sp. nov. 



§§ Posterior angles of head not 

 smooth and shining. Sculpture 

 coarser. 



A. Head evenly and finely 



rugose, rugae but little divergent 



posteriorly, without distinct inter- 



rugal sculpture, barbatus Smith. 



I. Head, thorax and legs 



black ; petiole, postpetiole 



and gaster red. 



barbatus Sm {typicaf). 



