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based on specimens of Dr. Clemens' Ceratomia repentinus, which is in 

 our opinion structurally distinct from Ceratomia quadricornis Harris, 

 we are led to propose that Mr. Walker's genus be retained for this 

 species, which differs from the allied genera here cited, in the reduced 

 caputal and prothoracic parts, characters which ally it to Ceratomia Har- 

 ris, and which, perhaps, occasioned Dr. Clemens' reference. Since, under 

 the circumstances, it would hardly be possible to satisfactorily identify 

 this species from Mr. Walker's description of it as Daremma undiilosa, 

 we have retained the trivial name proposed by Dr. Clemens, though 

 posterior in point of time. We have adopted the views of Mr. Grrote on 

 the synonymy of this species, which has been strangely confused hitherto 

 by authors with Drury's Sphinx brontes. 



Ceratomia amyntor. 



We do not comprehend Dr. Clemens' citation of Hiibner, as authority 

 for Ceratomia quadricornis Harris, unless it is a confusion arising from 

 the initial letter placed by Dr. Harris after his new species, in the 

 " Catalogue of N. Am. Sphinges" and elsewhere. To our knowledge 

 Hiibner never described the present species, but it is acceptably figured 

 as Agrius Amyntor by Hiibner in the " Sammlung, P]xot. Schm." 

 Hiibner could hardly have given this species a trivial name drawn from 

 larval characters, since these could scarcely be known to him. He re. 

 garded the species as belonging to the genus Agrius, erected in 1816 

 in the " Verzeichniss." Since this cannot be accepted, the term Cera- 

 tomia, proposed by Harris in 1839, must be retained for the genus, 

 which is represented by a single species of common occurrence in the 

 Atlantic District, and for which, following the law of priority, we must 

 retain the specific name under which Hiibner has figured it. 



Sphinx chersis. 



K similar error has been made by both Mr. Walker and Dr. Clemens 

 in the synonymy of this species, described as S. cinerea by Dr. Harris, 

 as in the case of Ceratomia quadricornis Harris, above stated. Hiib- 

 ner 's figure is quite recognizable, and executed with the accustomed 

 felicity which characterizes the illustrations in the " Sammlung Exot. 

 Schmmetterlinge." Hiibner refers the species to his genus Lethia, 

 erected in the " Verzeichniss," and which term may yet be used for 

 the species here included under Sphinx, should Linnteus' generic term 

 be used in a different sense from that in which later authorities re- 

 gard it. 



HYLOICTIS. 



The species here included under this generic term, we are led to consider 



