11 



This species has also been received from Utah and Arizona. 

 I have also in my collection, examples received from Mr. Henry- 

 Edwards (No. jG), from Havilah, California, and Vancouver 

 Island in the Middle and Eastern States. 



NiSONIADES ICELUS, Lintn. 



Mr. W. H. Edwards has allowed me to examine two exam- 

 ples of this species, which he had obtained from the Western col- 

 lections of Mr. Morrison in 1880, taken in Washington Territory, 

 This extreme western locality for this insect is an interesting 

 addition to our knowledge of its distribution. Mr. Scudder, in 

 his Systematic Revisio7i of American Buttei-fiics (1872), gives as its 

 distribution, Canada to West Virginia; Atlantic Coast to Michi- 

 gan. In the Edwards' Catalogue of the Diiirnals of North 

 America (1877), its habitat is given as New England, Middle 

 States and Illinois. Subsequently (my Entomolog. Contrib., No. 

 IV., 1878), I identified it among some Colorado collections of Mr. 

 Morrison. These western examples do not differ in size or in any 

 particular feature from our eastern forms. The examples before 

 me are without date of collection. They are in fresh condition, 

 and are rather more strongly marked with white scales toward 

 the costal and outer margins of the primaries than those ordinarily 

 met with. 



An interesting feature of this species, observed by Dr. 

 Speyer, is noticed in his valuable paper on the Genera of the 

 HesperidcB of the European Faunal-Regton (Canad. Entomol., x. p. 

 169). It is the presence of a long and thick tuft of hairs on the 

 posterior tibiae. This is not found in N. Brizo Boisd.-Lec. — a 

 species so closely allied to N. Icelus, that some writers have ques- 

 tioned their specific difference. It has been observed in but one 

 other species of Nisoniades, viz., N. Persius Scudd. It also charac- 

 terizes the Hesperidean genus Daimia of Murray, of which the 

 European D. Tethys Men. is the type and sole species, and 

 Scelothrix of Ramb. — united with Pyrgus H. by Dr. Speyer in his 

 last Revision of the European Hesperidae (1878), as Group 11, 

 having inaculatus Brem. as the type of the group. This tuft or 

 hair-pencil differs in the several species. In N. Icelus it is pro- 

 duced from the femoral joint of the tibia, and is widely spread 

 apart in the examples before me. In length it exceeds the tibia 

 by nearly one-half. Like the costal-fold, it is probably confined 

 to the B sex. 



A revision of the proof of this paper has enabled me to add 

 the following: Since the above was written, an examination of 

 the Nisoniades in my collection has shown the presence of the 

 tibial hair-pencil also in the males of N.funeralis Boisd., N. Ncevius 

 Lintn., and N^Lucilius Lintn. I cannot detect it in any other than 

 the above mentioned five species. In the genus Pyrgus, I find it 



