190 THIRTIETH REPORT ON THE STATE MUSEUM. [78] 



and a bright yellow substigmatal one indicated by obscure 

 yellowish markings at the incisures ; a dark, bluish-gray 

 transverse line on the side of each segment the same shade 

 surrounding the stigma and extending to the proleg ; on the 

 eleventh segment a blackish transverse line running behind 

 the stigma upon the caudal horn the latter .09 inch long, 

 glossy black. Caudal shield ferruginous, rugose, elevated 

 marginally and in a small tubercle centrally, in outline a broad 

 ellipse having a lenticular portion excised from its upper 

 fourth ; anal plates subtriangular, and of a similar color and 

 surface. Stigmata depressed, elliptical, surrounded (except 

 the first) with a well defined white ring which is more broadly 

 elliptical than the stigma. 

 Entered the ground for its pupation on Sept. 16th. 



The larvae briefly described by me in the Proceedings of 

 the Entomological Society of Philadelphia, vol. Ill, p. 670, 

 were in all probability this same species. Their color is given 

 as bluish-slate, of about the shade of the branches of the 

 poplar, on which they were feeding (Populus nigra). The 

 body is described as gradually increasing in size to the tenth 

 segment ; the eleventh segment elevated in a hump, bearing 

 the black caudal horn, one-tenth of an inch long ; the stig- 

 mata broadly oval, black, white annulated. It is probably 

 identical with the form occurring in Europe, and mentioned 

 as a variety of the dictcea larva. 



All my efforts to obtain the imago from the above larvae, 

 have resulted in failure. Examples of the larvae collected by 

 Mr. von Meske, have also failed to give the imago ; after 

 having safely reached the pupal state, they have uniformly 

 died while in that stage. A figure of the larva, taken from a 

 drawing made by me, is given in Glover' s Plates of Lepidopt- 

 era, XCIX, fig. 16. 



No examples of the pupae, unfortunately, have been re- 

 tained, and I am only able to recall their smooth and shining 

 surface, and the tapering form of their abdominal segments 

 tipped with a rather long, bifid anal spine. 



Mr. Graef, of Brooklyn, has succeeded in rearing the moth 

 from larvae collected by him, and to him I owe the privilege 

 of being able at the present to refer descriptions made by me 

 several years ago of larvae which have meanwhile proved an 



