132 ENTOMOLOGICAL NEWS. [April, '07 



ing the wing in the centre of the outer area (the area beyond 

 the mesial line) is a more or less distinct row of spots. The 

 hind wings have a small tail. In specimens from Texas there 

 is almost no differentiation between the outer and inner half 

 of the wing by the mesial line, and this line on primaries is 

 more or less absent. There is no correlation between any of 

 these characters given above. 



Thccla arsace Bd. Lee. is the same species as irus, the differ- 

 ences being varietal only. The figure is very poor, but I have 

 some specimens agreeing with the description. It is a large 

 Southern variety. 



Distribution of my specimens. New Hampshire ; Lonsdale, 

 R. I., iv. 27 ; v. 2 ; Johnston, R. I., v. 12, v. 26; Philadelphia, 

 Pa., v. 4; Clementon, N. J., v. 7; Almonessen, N. J., iv. 28; 

 Westville, N. J., v. ; Anglesea, N. J., iv. 26; Falling Spring, 

 111., iv. 12; Cincinnati, O., iv. 15, v. 20; St. Louis, Mo., iv. 21 ; 

 Round Mountain, Texas; ii. 25, iii. 25; North Carolina; 

 Louisiana. I have not seen any specimens from Canada, 

 and would like very much to have specimens from the North 

 and the Pacific Northwest. Sufficient allowance has not been 

 made in our studies for individual variation. There are cer- 

 tain kinds of variation, individual or varietal, and other kinds 

 specific. The basal area on the underside of secondaries of 

 irus varies wonderfully in color and is a common type of indi- 

 vidual variation in butterflies. A similar variation is seen 

 on the upperside of Argynnis cybclc, where the inner area is 

 almost completely suffused with black. Numerous specimens 

 and accurate data will elucidate many problems that confront 

 us, brought about by the lack of material and data of the early 

 students and writers. From the evidence before me I am con- 

 vinced that Thecla irus and hcnrici are one species. 



MR. W. H. VOLK, who has been conducting experiments for the Uni- 

 versity of California against the codling moth in Watsonville, has been 

 appointed joint entomologist of Santa Cruz and Monterey Counties. 



H. J. QUAYLE has returned from the Iowa State Agricultural College 

 and has accepted the position of Field Assistant in Entomology in the 

 University of California. 



