connected with the inner margin, and a yellowish cell of the pri- 

 maries) have the abdomen as largely black. 



The size is very variable. P. oregonius male expands from 

 80 to 98 mm. {s}4.-3}i inch); the female from 100 to no mm. 

 (4-4^ inch). P. Zolicaon, male, from 78 to 86 mm.; female 92 

 to 94 mm. (100 mm., W. H. Edwards). The tail of the wings 

 varies in length from 5 to 9 mm.; in breadth from i to 2^ and 

 sometimes to 3 mm.; its form is very variable, strongly spathulated 

 or rounded or pointed at the tip. 



In Yakima Valley, July 5th, Mr. Henshaw found a full grown 

 caterpillar feeding on wild parsnip, Mr. Stretch one on sage. 

 The first one escaped by accident, but Mr. Stretch managed by 

 ingenious contrivances to educate the imago, which proved to be 

 P. oregonius. The caterpillar is very similar to that of P. inachaon 

 in form, color and pattern. As I am very well acquainted with 

 the latter, I remarked directly a difference. The first transversal 

 black band behind the head has a large gap in the middle, perhaps 

 as large as the remaining part of the band, on each side. P. 

 inachaon has never this band interrupted, at least not in the 

 specimens before me ; nor find I mentioned such an interruption 

 in any description or figure of the caterpillar ; also not in Mr. 

 Stretch's figure and description of P. Zolicaon, published by Mr. W. 

 H. Edwards, and not in his description of P. oregonius, "Papilio," 

 II., p. 120, The chrysalis agrees with that of P. Zolicaon. Mr. 

 Stretch has made a colored sketch of the caterpillar. The chrysa- 

 lis skin is before me. 



After all, there is no doubt that P. oregonius is merely a 

 variety of P. Zolicaon, mostly larger in size, more yellow, the 

 black spot connected with the black interior anal band, which is 

 somewhat dilated on tip, the black bands of the abdomen nar- 

 rower. 



P. oregonius (not oregonia, as Mr. Edwards writes), was very 

 common on both sides of the Columbia River at Umatilla, June 

 24th to 26th ; at The Dalles, June 23d, it was not observed, though 

 eagerly looked for. It was not seen June 30th at Lone Tree on 

 the Yakima River, but on returning to the same place July i8th, 

 one old specimen was collected ; probably P. oregonius had there 

 appeared and disappeared in the time between those days. 



At the mouth of the Natches river, at a higher elevation, 

 July 4, the full-grown larva was still found, therefore the imago 

 would not appear there before the end of July. The specimen 

 raised by Mr. Stretch appeared July 25. 



When P. oregonius was observed at Umatilla we all believed 

 it to be P. inachaon, the more so as Mr. W. H. Edwards had just 

 published (" Papilio," p. 74) the capture of a specimen by Mr. 

 H. Edwards at The Dalles, where we had looked for this species 

 without success. A careful comparison of Mr. W. H. Edwards' 

 paper with the materials at hand has given the following result. 



