Sep'. 1 8 9 8.] Kunze: Two Forms of Cerura nivea. 191 



larval differences of nivea and cinerea. The dorsal ornamentation of larva of nivea 

 is bordered by a ftint yellow line. Dorsal patch of joints 6, 7, 8 and 9, diamond- 

 shaped, bluish- white on median line, edged rosy lilac when viewed in certain light 

 and bordered jellowish. All diamond shaped patches much constricted near place 

 of union. The patch of segments 10 and II, also diamond shaped and in coloration 

 like preceding. On segments 4 and 5, the yellowish border of dorsal patch is almost 

 confluent, a trace of lilac tint between it. Joint 12, has a median lilac line which 

 widens on joint 13, to form a smaller diamond patch reaching to venter. This dorsal 

 patch is more lilac on median surface than the other. A brown elevatt d spot now marks 

 the place of former prothoracic processes. Supra aDd inlra?piracular surface light 

 green, spotted and speckled lilac and yellowish over entire parts, as far down as 

 feet. These spots vary from ovoid to hemispherical. Below the yellowish border of 

 dorsal ornamentation of posterior half of body, the green color of larva is lighter 

 tinted, spiracles brown, white- centered. Thoracic feet ytllow, laterally spotted brown 

 and sparingly pilcse. Abdominal feet pilose, claspiDg surface white, and just above a 

 brown lunulate mark covered by 6-8 hairs. Abdominal surface concoloring with 

 lateral parts. Dorsal and lateral surface smooth. Stemapods have lost the bright 

 color of previous stage. Spinose, with setse now very short. 



Cocoon. — Color, dark drab. Shape, elliptical, very little flattened, strong, not 

 indented by finger. Size, length, 24 mm ; width across central area, 9 mm. 



On the night of October 2 2d, this larva only 26 days old. com- 

 menced to make its cocoon. The only one other example of this brood 

 for five or six days tried hard to transform and failed, so that finally I 

 made an alcoholic specimen of it for Professor Packard. 



WHITE FORM OF CERURA NIVEA. 



The accumulated evidence referred to under this heading should be 

 accredited to the whitest form of an Arizona cerurine, heretofore known 

 as a variety of cinerea. The example from which bred, a female as 

 white as the driven snow, was ornamented with a minute, black spot 

 between each vein on external margin of primaries. The antenna? 

 showed very little black, which was confined to the branches, all else- 

 where a spotless white. The insect was secured at light in this city. 

 Confined in a small paper box, I obtained 65 ova, all laid singly, of 

 which about fifty hatched October 8, 1897. In color and size, as well 

 as shape, the ova were black and hemispherical like those of the pre- 

 vious female referred to. Of this brood about 33 reached maturity, and 

 besides reserved two examples of every stage in alcohol for the use of 

 Professor Packard. A full-grown larva or nearly so, by the time it ar- 

 rived in Providence, R. I., was sent alive, and of which the doctor 

 wrote me, Mr. Joutel made a beautiful figure. Of the earlier stages I 



