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slightly irregular in its outline. In Euferpe, the space behind the broad 

 blackish basal shade, is very distinctly gray, mottled with fawn color, 

 and with a few scattered white scales. The inner edge of this gray space 

 overreaches upon the broad black border in 3 very deep and distinct 

 teeth, one on the internal angle, one in the middle and one reaching al- 

 most to the apex, thus differing in a remarkable manner from the form 

 of the posterior border of Phaeton. The fringes are also distinctly longer, 

 and bear more white in Euterpe than in the other species. The second- 

 aries are, as I have said, more rounded on their margins, the black 

 marginal band is broader than in Phaeton, and is swollen in the middle 

 of its inner edge, while in Phaeton this edge is quite straight. The base 

 of the lower wing in both species is black. In Phaeton, the disc is pale 

 primrose yellow, this shade being nearly of the same width throughout. 

 In Euterpe, the disc is clear white, very broad on the costa, but abruptly 

 narrowing, so that at the anal margin, it is only one fourth of the width 

 on the costa. In Phaeto?i, the thorax is clothed with long gray hairs, 

 while the abdomen, which is black in both sexes, bears on the sides of 

 the 4th and 5th segments bunches of pale yellow hairs, which are also 

 visible beneath. In Euterpe, the clothing of thorax and abdomen is 

 blackish gray throughout, and there is no trace whatever of the yellow 

 lateral patches. On the lower side the markings are repeated in both 

 species, but in Phaeton they are sharply and clearly defined, while in 

 Euterpe they are confused and somewhat indistinct. The difference in 

 shape of the discal mark of the primaries is very decidedly displayed on 

 the lower side, and in Euterpe there is a distinct linear discal mark on 

 the secondaries, absent in Phaeton. In Euterfe. the hairy covering of the 

 legs and lower side of the abdomen is blackish gray throughout, while in 

 Phaeton the clothing of the legs is yellowish while mixed wich gray, and 

 the abdomen is blue black, with 2 faint white bands, and a sparse cover- 

 ing of gray hairs. In Phaeton, the antennae in both sexes are black 

 throughout, but in Euterpe the shaft is clear white, with the serrations 

 blackish brown. 



I have no doubt whatever of the distinctness of this lovely species of 

 which I have only seen the 9 example, from which the present descrip- 

 tion is taken. I have been careful to give a comparison between the two 

 forms, though there can be no possibility except at the first glance, of 

 confounding them. In shape of wings, robust form of abdomen, and 

 the structure of the antennas, Euterpe approaches very closely to the little 

 known Arctonotus lueidus. 



The unique example was captured near San Diego, California, by 

 the late H. K. Morrison. 



