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cliaracters are produced and reproduced throuoh successix^e broods 

 witliout chanoe, the same thiny always [)roduciny its pr()i»;eny exactly 

 similar to itself, it is entitled to rank as a species, and not as a variety 

 having- a tendency to return to its ])arent stock. I say here nothinc^ 

 as to the origin of these forms. It is possible, nay more, it is almost 

 certain that they all sprang from one form, but by the law of develop- 

 ment thev have now become, to all purposes necessary for us, as per- 

 manent and fixed as any other species can be, and as such they must 

 in future be investigated. It would be tedious for me to enter upon a 

 minute description of the species of this genus, but 1 ha\e brought 

 together for your examination the larvae and perfect insects of many of 

 them, so that vou may for yourselves remark their peculiarities, and 

 observe their differences. At the same time I wish to append to this 

 paper a description of the larval and imago stages of one of the new 

 species of which I ha\'e spoken, which I have called Daiana Drexelii, 

 in honor of Mr. Joseph Drexel, of this city, who has done, and is doing 

 much to foster a love for the study of Entomology amongst us. I may 

 here also state that a complete monograph of the group, with colored 

 figures of the species in all their stages, is now in the course ot pro- 

 duction by Mr. Elliot and myself, which will, I trust, clear up a good 

 many of the difficulties now surrounding these insects. Such a work 

 naturally must occupy a considerable time, but I trust it will not be 

 delayed longer than the close of the next summer. 



Datana Drexelii, n. sp. — L.\rva, full grown. Head almost globose, 

 jet black, shining, with deep frontal sinus, slightly roughened about 

 the posterior edges. Second segment zcholly golden yellow. Body 

 black, with four distinct, equidistant stripes of citron yellow, the space 

 between the two dorsal lines being a little the widest. These lines all 

 become conjoiyied, and form a yelloiv blotch of irreffiilar form at the 

 postcj'ior extremity. A citron yellow line runs along the base ot the 

 feet and legs, which is broken at the place of their junction. The anal 

 segment is jet black, with two protracted points. It is very shming, 

 like the head, the rest of the body being dull. The spiracles are dull 

 orange, as are also the swollen bases of the abdominal legs and thoracic 

 feet. Beneath there is a rather broad and distinct yellow median stripe. 

 The hairs are long, i^w to each segment, dull white, most numerous on 

 the lateral region. Eood-plant, high-bush huckleberry {facciniiim 

 corvmbosiim). Length 1.80 inch. 



Ij^i^^o.— Very like that of/?. Ministra. but differing in the following 

 particulars: the primaries of Drexelii have invariably fi\e trans\-erse 

 lines, and two darker spots on the disc, while in Ministra only four 

 lines' and a single spot are to be distinguished. The color is slightly 

 yellower brown, and the thoracic patch always paler than in Ministra, 

 while its edges are more oblique, and not constricted, as m the older 



