98 JOHN B. SMITH. 



hair to that forming the lateral and central series of abdominal spots ; anal tuft 

 concolorous with abdomen beneath ; extremities of anal hairs black. Wings 

 vitreous, anterior pair largely bright red at base, the scales encroaching on the 

 discal cell from the base; a narrow cross bar at end of cell; discal cell free. 

 External margin with a moderately broad, dark red, even band, narrowing to 

 internal angle, not dentate on the interspaces. Costa and internal margin bor- 

 dered somewhat narrowly with dark red scales; posterior wings bright red at 

 base and over anal angle ; external margin with an even border of dark red 

 scales. Centrally, the secondaries are vitreous, the diaphanous field crossed by 

 five nervnles; under surface resembling upper, the red color of the primaries is 

 a little brighter, especially along costa and at apices, when compared with the 

 color of these parts on the upper surface. The posterior wings are distinctly 

 shaded with pale yellowish over and within anal angle on the interspaces inside 

 of the external border. Expands 1.75 inches. 



Hab. — Canada, Maine, Massachusetts, New York, Eastern and 

 Middle States. 



There is no perceptible difference between the sexes. The species 

 appears in June and July, and as far as I am aware the early stages 

 are not described. 



This species, Messrs. Grote & Robinson say, while presenting too 

 many points of difference to be ruficaudis Kirby, is evidently the 

 form described as ruficaudis by Mr. Walker. Mr. Butler ex2)lains 

 that while one specimen of gracilis was placed by Mr. Walker among 

 the examples of ruficaudis, yet the Walkerian type is Kirby's species. 

 He further says that gracilis may at once be distinguished from even 

 the most similar examples of H. ruficaudis (Kirby?) Walker, by the 

 straight inner edge of tlie external brown band of primaries, the 

 more heavily scaled discocellulars and the smaller hyaline patch on 

 the secondaries. 



The species is not uncommon and seems very constant, except that 

 quite often six veins are very distinctly visible in the vitreous field 

 of secondaries. At least half of the specimens in Mr. Lintner's 

 collection examined by himself and myself proved to have six dis- 

 tinct veins. There could be no doubt as to the species. 



H. tliysbe Fabr., Syst. Ent. 548, Sesia; Sp. Ins. ii, 155, Sphinx; Mant. Ins. ii, 

 99, Sesia; Ent. Syst. iii, 1, 381, Sesia; Gmel. ed. Linn. S. N. 2, 388, Sesia; 

 Wlk., C. B. M. Lep. Het. viii, 82, Sesia ; Clem., Journ. Ac. N. S. Phil, iv, 1859, 

 129, Sesia; Morr., Syn. Lep. 1862, 149, Sesia ; Lint.,* Pr. E. S. Phil, iii, 646, 

 Sesia; G. & K., Pr. E. S. Ph. v, 150, Heemorrhagia ; Lint., Ent. Cont. i, 40, 

 Sesia; Grt., Buflf. Bull, i, 8, Hiemorrhngia ; Beth., Can. Ent. i, 10, Hsemor- 

 rhagia; Bd.. Sp- Gen. Het. i, 369, Macroglossa ; Butl., Tr. Zool. Soc. Lond. 

 ix. 521, Hemaris ; Hulst.* Bkln. Bull, ii, 38, Macroglossa ; Pilate, Pap. ii, 67; 

 Fernald,* Sphing. 16, Hemaris; Holland, Can. Ent. xviii, 102; Grt., Hawk 

 Moths, 27, Ihemorrliagia. 



