1904.] NATURAL SCIENCES OF PHILADELPHIA. 539 



Genus OSMILIA StSl. 



1873. Osmilia Stal, Recensio Orthopterorum, I, p. 68. 



Included Acrydium flavo-lincatum De Geer, Gryllus violacevs Thun- 



berg, Gryllus rufipes Thimberg, Gryllus ohliquus Thiinberg and Acridnim 



wxwulosimi Stal, of which flavo-lineatum may be considered the type. 



Osmilia toltecum (Saussure). 



1861. A[cridiu77i] ioltecum Saussure, ReA'ue et Magasin de Zoologie, 2e ser., 

 XIII, p. 163. [Temperate Mexico.] 



Guadalajara, Jalisco. August 24, September 18, 1903. (McClen- 

 don.) Two females. 



Alta Mira, Tamaulipas. June 28, 1903. (M. E. Hoag.) One 

 female. 



Genus DACTYLOTUM Charpentier. 

 1845. Dadylotum Charpentier, C)rthopt. Descr. et Depicta, tab. 52. 

 Type. — D. bicolor Charpentier. 



Dactylotum variegatum (Scudder). 



1879. Pezotettix variegatum Scudder, Proc. Bost. Soc. Nat. Hist., XX, 

 p. 75. [San Diego, California; Sonera; Fort Whipple and Buchanan, 

 and forty miles east of Tucson, Arizona.] 



Casas Grandes, Chihuahua. September, 1902. (Dr. W. E. Hughes.) 

 One female, two immature males. 

 Dactylotum histricum n. sp. 



Type: ? ; La Joya, San Luis Potosi, Mexico. August 10, 1903. 

 (M. E. Hoag.) 



Allied to D. variegatimi (Scudder), but differing in the slightly nar- 

 rower and more acuminate tegmina, the slenderer posterior femora, 

 the shorter metazona of the pronotum and the rather distinctive 

 coloration. 



Size rather large; form as usual in the genus. Head with the occi- 

 put hardly elevated above the pronotum, rounded ; interspace between 

 the eyes twice as wide as the inferior width of the frontal costa; fasti- 

 gium broad, very shall owly and broadly excavated; frontal costa 

 slightly constricted above, but broader than below the ocellus, greatest 

 width immediately above the ocellus, moderately sulcate throughout; 

 eyes elongate-ovate, truncate anteriorly, very slightly longer than the 

 infraocular portion of the gense; antennae equal to the head and pro- 

 notum in length, the extreme apex blunt and slightly depressed. 

 Pronotum slightly arched transversely and with a very noticeable trans- 

 verse convexity, as usual in the genus; transverse sulci strongly im- 

 pressed ; median carina absent on the prozona, finely marked on the 

 metazona, the latter only two-thirds the length of the prozona and 



