240 ENTOMOLOGICAL NEWS. [Sept., '04 



on the dark disk of Rudbeckia laciniata, another large yellow- 

 flowered composite plant. 



The orange-colored flowers of Asclepias tuberosa, well named 

 the butterfly- weed, furnish nectar for Argynnis nausicad and 

 Lemonias nais, in the early part of the season, and are quite pro- 

 tective to these insects. At the headwaters of the Hassayampa 

 these insects are found, and of nausicad I have only seen two 

 other examples near Flagstaff. So far I have not met with 

 any other species of Argynnis in this territory. Pieris proto- 

 dice is usually found on Nasturtium officinale or watercress, 

 and when this plant is out of bloom may be looked for on the 

 white flowers of Dithrcea wislizeni, a crucifer found in the 

 bottoms on the sandy banks of streams. This plant has very 

 glaucous leaves and stems, flowers several times during the 

 year, from early February until December, and is a favorite 

 food plant of protodice. Rarely have I observed this white 

 insect alight on any other colored flower. 



Thecla apama feeds on the white flowers of Ceanothus fend- 

 leri, and when disturbed seeks refuge among the foliage of 

 the same shrub. The bright green of the reverse side of the 

 wings agrees perfectly with the color of the leaves. When 

 frightened, I have seen it alight on the needles of Pinus pon- 

 derosa, if a bush of Ceanothiis stood not conveniently near. 

 Apama, with its wings folded, defies detection, illustrating 

 mimicry in the fullest sense. 



■ Pamphila bellus. This bluish-black skipper, with yellow 

 fringe on its wings, is usually feeding on the prominent yel- 

 lowish cones of Rudbeckia laciniata. It is not often observed 

 on any other but this cone-flower. Euda^nus cellus is its com- 

 panion in the Huachuca Mountains, rifling the yellow flowers 

 of Rudbeckia. On this flower bellus seems to be less protected 

 than cellus. 



Libythea bachmani, when frightened off the white flowers 

 of Baccharis emoryi, an evergreen shrub, on which it feeds in 

 September, selects for refuge the dry stems of the same plant, 

 and with closed wings it is not easily discovered. The gray 

 color of the dead twig and that of its wings on reverse side 

 makes it wonderful to behold. 



