Entomolooioal Contributions. 125 



II. TRANSFORMATIONS OF SOME BOMBYCIDiE. 



Platysamia Cecropia {Linn.). 



Two larvge, measuring .45 in. in length (after, probably, their first 

 molting), were found, July 13th, feeding on leaves of mountain 

 ash {Pyrus Americana). The body was dull orange, bearing six 

 rows of spines, four to six-branched at tlie tip. In the two dorsal 

 rows the spines wxre black, except in front where they were orange, 

 concolorous with the body ; spines of the remaining rows wholly of 

 a shining black. The eleventh segment, with but two spines, the 

 tenth with four, the ninth with live, and the others with six each. 

 On each segment two black dots between the spines, making them 

 centers of squares of four dots. Head and legs, when the larvae were 

 first taken, of a dark red, subsequently changing to black. 



After the second molting, they measured one inch in length and 

 were of a yellow-green color. On the second and third segments 

 superiorly, each, two globular-headed red tubercles with seven black 

 bristles ; on the seven following segments two dorsal rows of yellow 

 tubercles, sw^ollen apically, of which the two on the fourth segment 

 are larger than the others and bear seven bristles each, while the 

 following twelve have but five. On the eleventh segment, medially, 

 is a single yellow tubercle with eight bristles; on each side of these 

 yellow tubercles are oblong black spots. The two lateral rows of 

 tubercles light blue and setiferous, and beneath these, on the three 

 anterior segments, a black pointed tubercle. Head with two con- 

 verging black lines. Legs with black tarsi, and prolegs each with 

 a black spot exteriorly. 



The subsequent meltings were not observed. 



A captured Cecropia deposited over two hundred eggs, and from 

 her body, after deatli, nearly a hundred were taken, most of which 

 were of full size; the entire number was three hundred and five. 

 In their longest diameter they measured one-tenth of an inch ; in 

 their shortest diameter .083 of an inch. 



