March. 1902.] SmITH : NeW NoCTUIU.'E. 37 



Pacific, from Calgary, Alberta, to Hot Springs, New Mexico, and 

 "Texas." I have none from any part of California, but have exam- 

 ples from Corvallis, Oregon ; Seattle and Pullman, Washington ; and 

 several points on Vancouver Island. 



I have arranged these again and again in different ways, using first 

 one character and then another as basis, and have failed at last to 

 convince myself that there is more than one species, though the ex- 

 tremes differ markedly. Nowhere, however, is there any tendency 

 toward either fricosa or hcrilis and the validity of the species as dis- 

 tinct from them is abundantly confirmed. Neither antennal nor geni- 

 talic structure give us any assistance. There is a little difference, ap- 

 parently, in the length or thickness of the former as a whole, and of 

 the lateral processes of the joints, but not more than is within specific 

 range. In fact, two specimens most nearly alike and from identical 

 localities sometimes showed greater differences than the most unlike 

 examples from opposite sides of the continent. The genitalic structure 

 of the male is absolutely identical. 



Taken as a whole examples from the Pacific Coast and from Calgary 

 are larger and seem more robust, especially in the male. In my 

 eastern series the males as a whole are smaller and slighter than the 

 females. In the Oregon, Vancouver and Washington series the males 

 were uniformly larger than the females. There are of course small 

 males and large females, but the average is as I stated. 



In the color of the secondaries the range is from almost uniform 

 wJiite to an even smoky black, in both sexes ; though the females 

 rarely have clean secondaries. All intermediate forms are found, from 

 the narrow dusky margin to the complete domination of the darker 

 color. The costa, subterminal and internal regions may be bright 

 yellowish gray and contrasting, or they may be even, smoky, without 

 any relief. 



The orbicular varies little : it may be darker or lighter than the 

 costa and may be rounded or angulated at the bottom. The reniform 

 varies more, in color and in form As to form it is normally kidney- 

 shaped, of moderate size and well proportioned. Sometimes it 

 broadens and the outer margin becomes straight. Then it may narrow 

 and the curves become intensified : or it may become upright, losing 

 all curve, or becoming a long oval. Normally the spot is annulate 

 with yellowish, the center reddish or brown, with a narrow, yellow, 

 central line. This mav become uniform, the central line being lost ; 



