398 PROCEEDINGS OF THE ACADEMY OF [July, 



In size there is considerable variation in the series, all being smaller 

 than Scudder's original measurements. The extremes of the series in 

 hand are as follows : 



The distal portion of the furcula varies in the two males, being rather 

 slender in one and comparatively thick in the other. 



The majority of the specimens are strongly overcast with brownish, 

 sometimes with a decided olivaceous tinge, only one specimen being 

 "luteo-testaceous" as originally described. 



In addition to the original record from the Grand Canyon, this 

 species has been recorded from Bill Wilham's Fork by Rehn and from 

 Tucson by Snow. 



DACTYLOTUM Charpentier. 

 Dactylotum variegatum Scudder. 



A male and two females of this species, taken July 6 on the plains at 

 the east base of the Huachuca Mountains by H. Kaeber, have been 

 examined. 



TBTTIGONID^. 

 ARETHJEA St&l. 

 Arethaea sellata Rehn. 



A male of tliis species, taken at Palmerlee, Huachuca Mountains, July 

 15, by H. A. Kaeber, has been examined. 



SCUDDERIA Stai. 

 Scudderia furcifera Scudder. 



This species is represented by a male taken at Palmerlee, Huachuca 

 Mountains, July 6, by H. A. Kaeber. 



MICI10CENTRUM15 Scudder. 

 Miorocentrum rhombifolia^^ (Saussure). 



A single female of this species was taken at hght at Nogales, August 

 13, 1906, by Calvert. 



" Abnormally distended. 



" Kirby {Synon. Catal. Orth., II, pp. 4.55, 480) has transferred this generic 

 name to the genus usually known as Stilpnochlora Stal, and in its place for 

 Microcentrum of authors uses Orophus Saussure, 1859. For the type of the latter 

 he selects retinervis Burmeister (salicifolia Saussure), disregarding the fact that 

 Relm (Proc. Acad. Nat. Sci. Phila., 1905, p. 808, March, 1906) some months 

 previously had selected mexicanus as the type of Orophus. In selecting a type 



