236 JOHN B. SMITH. 



pears to be furnished with a series of bristles, as in some genera of 

 ^^gerldce. The thorax and abdomen are densely clothed with long 

 hail-, the latter being very robust and much shorter than in Phaeton, 

 extending very little beyond the wings. The wings are broader than 

 in the more familiar species, the primaries being entirely more 

 rounded and not produced at the apex, while the secondaries instead 

 of being oblique upon the margin, are very distinctly rounded, the 

 apex being the opposite of acute. In color, there is gi-eat resem- 

 blance between the two forms, though in Euterpe the shading of the 

 upper wing is brownish, while in FJuvton it is black. In F/ueton the 

 l)asal line is geminate and slightly oblique, the outer of the double 

 lines turning slightly toward the l)ase on the costa. In Euterpe it is 

 single, thick, slightly dentate on its outward edge, while behind it is 

 a deep blackish brown shade reaching as far as the cell and there 

 touching an ovate discal spot. In Plueton the space behind the basal 

 line is grayish, mottled with black to a space about 2 mm. from the 

 margin and the discal mark is linear and not ovate. Before reach- 

 ing the rather broad black posterior margin there are 3 faint black 

 lines from the internal mai'gin which are obsolete before reaching the 

 costa. The inner edge of the postei-ior margin is sinuate and very 

 sli'ditly irregular in its outline. In Euterpe 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 u})on the broad black border in 3 very deep 

 and distinct teeth, one on the internal angle, one in the middle and 

 one reaching almost to the apex, thus differing in a remarkable man- 

 ner from the form of the posterior border of Phaion. The fringes 

 are also distinctly longer and bear more white in Euterpe than in 

 the other species. The secondaries are, as I have said, more 

 rounded on their margins, the black marginal band is broader than 

 in Phcetoii, and is swollen in the middle of its inner edge, while in 

 Phceton this edge is quite straight. The base of the lower wing in 

 both species is black. In Plueton the disc is pale primrose yellow, 

 this shade being nearly of the same width through(jut. In Euterpe 

 the disc is clear white, very broad on the costa, but abruptly narrow- 

 ing, so that at the anal margin it is only one-fourth of the width on 

 the costa. In Plupton, the thorax is clothed with long gray hairs, 

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

 of th(; 4th and 5th segments bunches of i)ale yellow hairs, which ai'e 

 also visible beneath. In Euterpe the clothing of thorax and abdo- 



