H4 ENTOMOLOGICAL NEWS. [March, '13 



light brown. On the under side, especially of the secondaries, 

 the brown is a shade lighter than on berenice and may be de- 

 scribed as being between the light brown of plexippus and the 

 chocolate brown of berenice. The black borders of the wings 

 are not so heavy as on berenice, nor are the veins on the under 

 side of the secondaries so heavily outlined with black. In my 

 series of berenice these black lines on the under side are gen- 

 erally well bordered with ashen gray. This is not often the 

 case with strigosa. Strigosa generally, though not always, has 

 the veins on the upper side of the secondaries bordered with 

 ashen gray. It very seldom, however, is marked heavily 

 enough to give the butterfly a "streaked" appearance. 



Strigosa runs very true to the form described above. It 

 extends over a fairly wide strip of territory from Southern 

 California in the neighborhood of Los Angeles eastward at 

 least to longitude 97 degrees west, and it probably occurs still 

 further east. It would be of great interest to learn from col- 

 lectors between Texas and Florida whether the change between 

 the two forms occurs gradually or whether strigosa's territory 

 is confined to the semi-arid region of the Southwest. From 

 the limited amount and variety of Florida material available 

 for my study I rather suspect that the late fall brood of here- 

 nice inclines toward the strigosa type of coloration. 



Limenitis obsoleta. 



Obsoleta is immediately noticeable for the remarkable ac- 

 curacy with which it has mimicked the coloration of D. stri- 

 gosa. When I first observed it drifting lazily about on the 

 plains near Phoenix, Arizona, I did not give chase, as I had 

 long series of strigosa. It was not until I saw one sitting on a 

 flower with wings outstretched and the tell-tale bar across the 

 secondaries plainly in evidence that I realized that it was obso- 

 leta. It has exactly the same shade of dark brown in the basal 

 area and along the costal edge. This shades lighter outwardly 

 to a line of black-bordered white spots separating the discal 

 and limbal areas. Outside of this line the brown is noticeably 

 lighter, imitating the corresponding areas in strigosa. 



On the under side the same close imitation of strigosa col- 



