74(5 ZOOLOGY— INSECTS. 



terminating on hind margin edged by broad bands of yellow-green, reach- 

 ing to the middle of disk, and connected anteriorly ; three large spots of 

 same color about the cell, two being at the outer angles, and one above and 

 reaching the costa ; another large triangular subapical spot on costa ; the 

 nervures at base also banded with green ; all these bands and spots slightly 

 sprinkled with black scales. 



Body above covered with gray hairs ; beneath, abdomen yellowish ; 

 thorax white ; legs white ; palpi white, gray on upper side and at tip ; 

 antenna' white above and at base below, beyond brown ; club black, 

 nearly covered with rows of white scales ; tip pale fulvous. 



Female. — Expands two inches. Primaries less produced and broader 

 than in male ; same shade of color ; the marginal spots enlarged and 

 extended to second branch of median ; in addition to the three subniarginal 

 spots, which are also enlarged, is another in submedian interspace, and a 

 streak below this along inner margin ; the cellular spot much enlarged, 

 rhomboidal, with slight central streak ; secondaries have a patch on costa, 

 and four on the marginal nervules commencing at and posterior to subcostal ; 

 also an interrupted submarginal stripe opposite cell, posteriorly indistinct ; 

 under side as in male, except that a round black spot appears in submedian 

 interspace on primaries. — Edwards, I. c. 



This species has recently been asserted to lie identical with Chloridice 

 of Europe ; but this seems to me extremely doubtful, since the same thing 

 has been lately maintained regarding P. Occidentalis and Callidice, and even 

 Grapta Faunas, Satgrus, and Comma have been called varieties of C. Album ; 

 all these species being abundantly distinct. 



P. Beckerii was found by the expedition in Southern Utah. Regarding 

 its habits, Mr. Henry Edwards, its discoverer, writes as follows : 



"This beautiful species, characterized by Mr. W. H. Edwards as the 

 finest of the North American Pierides, appears to be extremely limited in 

 its range; the only locality at present known by me being the neighborhood 

 of Virginia City, Nev. It is an early insect, being seen on the wing, if the 

 weather be favorable, somewhere about the 10th of April, disappearing 

 toward the close of May. It is a rapid flier, and is taken with great dif- 

 ficulty. The best time for its capture is in the early morning, when it 



