106 JOHN B. SMITH. 



H. ruscicaudis Bd., in Wlk. C. B. M. Lep. Het. viii, 83, Sesia ; Clem., Jour. 

 Ac. N. Sci. Ph. iv, 1859, 130, Sesia : Morris, Synopsis 1862, 1.50, Sesia ; G. & 

 E., Pr. E. S. Phil, v, 150, Hxmorrhagia ; Grt., Buff. Bull, i, 8, 19, Hxmorrha- 

 (jia : Bd., Sp. Gen. Het. 1, 373, Macroglossa ; Bull., Tr. Zool. Soc. Lond. ix, 

 522, Hemaris; Strk., Lep. Rhop. et Het. 140 = thj/she : Maassen, Stett. Ent. 

 Zeit. 1880, V. 41, p. 51 = thysbe. 



Of this species Boi.sduval says: "At first glance one would take 

 it for pyramus, but it is well distinguished by the following charac- 

 ters : The last five segments of the abdomen and the anal brush are 

 red brown ; 2d, the brown color above is separated from the olive 

 by a transverse line of pure white ; 3d, the ba.se of primaries is as in 

 thysbe, much more largely black, so that this ct)lor absorbs the little 

 transverse ray at the end of the cell. From a unique example in 

 the British Museum from Georgia." 



Grote & Robinson, in Ann. Lye. viii, say that the species is un- 

 known to them, but they " have examined a drawing of this species 

 made under the superiutendance of Mr. Walker, which shows it to 

 be much nearer allied to thysbe than the present species, [^Jioridensis'] 

 since it is slenderer and shows the inner margin of the terminal band 

 of the primaries to be plainly dentate as in H. thysbe, while the ab- 

 sence of the olivaceous lateral shades on the terminal abdominal seg- 

 ments is the only prominent character which distinguishes Mr. AVal- 

 ker's S. fuscicaudis from Fabricius' species, to judge from the brief 

 diagnosis of the former given in the British Museum Li.sts." 



In Buff. Bull, i, Mr. Grote suggests that this may be only a form 

 of thysbe. In his New List he places it as a good species, elsewhere 

 stating that he does not positively know it. 



The synonymy and the various notes under the species from thysbe 

 to fuscicaudis have made insufficiently clear that it is extremely un- 

 certain what rank these forms have. Whether we have one variable 

 form thysbe, or else a nund)er of closely allied species. Mr. Grote 

 holds that there are a number of allied species. His synonymy is 

 THYSBE, var. UNiFORMis = Tuficaudis, var. floridensis, buffalo- 



EN8IS, FUSCICAUDIS. 



Mr. Strecker, in his vaiious papers, has expressed himself in no 

 uncertain terms as to the specific standing of the fjrms. 



His notion seems to be that we have two forms, — thysbe, of which 

 fascicaudis is the Southern form differing in nothing except its gi-eater 

 size. The slight differences in color pointed out by Mr. Butler 

 (hereinafter cited) are regarded as evanescent ; fioridensis, Mr. 

 Strecker would undoubtedly refer to the following species, ruficaudis. 



