]76 THIRTIETH REPORT ON THE STATE MUSEUM. [64] 



dark ground. The margins of the wings bear a black mar- 

 ginal line, obsolete toward the apex of the primaries. 



Expanse of wings, 1 .20 inch : length of body, .48 inch. 



Habitat. Colorado. 



I venture, from a single example, to designate this as a dis- 

 tinct species, in consideration of the entirely different aspect 

 it presents from the other forms. It is one of the smallest 

 of our species, about equal to N. Ausonius ; has unusually 

 rounded wings, and is more distinctly marked than any other 

 species, except N. Martialis* from which it differs materially 

 in the shape of its wings and its transverse band of spots less 

 inflected at its last fourth toward the outer margin. 



I have no opportunity of determining at the present, if the 

 above may not be one of the two species from Colorado, to 

 which Mr. Scudder has given the MS. names of N. Petronius 

 and N. Rutilius, in Lieut. Wheeler's Report upon Geo- 

 graphical and Geological Explorations and Surveys West 

 of the One Hundredth Meridian, 1875, pp. 786, 787.* 



Through the kindness of Mr. W. H. Edwards, I have been 

 permitted to examine a number of examples of NISONIADES 

 collected in 1 877 by Mr. H. M. Morrison, in Colorado. They 

 were all perfectly fresh, in fine -condition for examination, and 

 were as follows : 



Nisoniades Icelus Lintn. 



Several examples did not differ, apparently, in the slight- 

 est particular from New York specimens, except in one small 

 individual, of less than an inch expanse of wings, in which 

 the pale color, indistinct ornamentation, and small size, are, 

 in all probability, the result of imperfect development in the 

 larval stage. One specimen of this species is reported by Mr. 

 Mead, loc. cit., as having been taken in Central Colorado, but 

 in Edwards' Catalogue of Lepidoptera (1877), its greatest 

 western distribution is given as Illinois. 



Nisoniades Brizo Boisd.-Lec. 



The examples of this species in their bright coloring and 

 distinct ornamentation were more beautiful than any which 



* Chapter VIII Report upon the Collections of Diurnal Lepidoptera made in Colorado, 

 Utah, New Mexico and Arizona^ during the years 1871-1874. By Theodore L. Mead, pp. 738, 

 794 ; plates xxxv-xxxix. 



