16 TWENTY-THIRD REPORT ON THE STATE CABINET. [148J 



showing no relief; their surface, as also that of the wing-cases, rough or 

 crape-like ; the abdominal portion, conical in the male, and slightly 

 ovoid in the female. The margins of the three sutures pertaining to 

 segments 4 - Y have a plaited appearance ; the next three sutures are 

 regularly striated, as if milled on their anterior margin, as appears 

 more distinctly when the pupa-case has been extended by the escape 

 of the imago ; the anterior margin of the eleventh segment is promi- 

 nently plaited. The terminal spine is triangular, flattened, and ends 

 in a number of short, brown, bristly fibres. Length of the male pupa, 

 .80 to .95 of an inch ; of the female, from .95 to 1.10 of an inch ; 

 diameter of male, .31 to .38 of an inch ; of female, .38 to .42 of an 

 inch. 



The pupa may be readily separated from that of Hyperchiria lo 

 (Fabr.) by the absence of the short ferruginous hairs which characterize 

 the latter. 



Imago. The moth has been described and figured by various 

 authors from the time of Fabricius to Harris, and its description at the 

 present would, therefore, be quite unnecessary. In the last edition of 

 Harris' Insects Injurious to Vegetation, an excellent figure is given of it. 

 Its translucent crape-like wings, the white mesial band traversing the 

 black wings, the conspicuous red anal tuft of the male combine to 

 render it one of the most beautiful of our moths, and a valued addition 

 to entomological collections. 



The first imago from the above pupse emerged on September 18th, 

 a second on the 24th, a third on the 29th, a fourth on the 30th, and 

 the last for the season on October 4th. Of these six individuals, only 

 one was a female. 



Metamorphoses. For convenience of reference, the periods required 

 for the several changes embraced in the transformation of H. Maia 

 is herewith tabulated : 



From hatching to first molt 8 days. 



first molt to second molt 7 



second molt to third molt 9 



third molt to fourth molt 8 



fourth molt to fifth molt 13 



fifth molt to maturity 6 



maturity to pupa 5 



pupa to imago 58 



Duration of larval state 56 



Duration of pupa state 58 



From the egg to the imago 114 



Discrepancies. The published accounts of this moth are so uncer- 

 tain and conflicting as to show a very imperfect knowledge of its 

 larval state, and of the method and duration of its pupation. The 

 figures given by Abbot of the larvae are quite inaccurate ; and he also 



