5Q PROCEEDINGS OP THE AMERICAN ACADEMY 



Saturnia carpini, for a specimen of which I am indebted to M, P. 

 Chretien of Paris, the setiferous tubercles are of the same size and 

 shajDe on the abdominal as on the thoracic segments, there being no 

 differentiation in shape and size or color, such as occurs in all the 

 other genera, except that the second and third thoracic dorsal tuber- 

 cles bear one or two bristles much longer than those on abdominal seg- 

 ments 1 to 7, and about as long as those on the 8th abdominal segment. 

 There are six tubercles on this (8th) segment, being the same number 

 as on the seven segments in front ; on segment 9 there are four tuber- 

 cles, and two on the 10th segment, i. e. the suranal plate. The same 

 number of tubercles on the 8th abdominal segment also occurs in 

 Saturnia mendocino * of California. Likewise the same number is 

 present in the European S. pyri, judging by the figure and description 

 in Duponchel et Guen^e's Iconographie (II., PL I.), and the state- 

 ment, " On ne compte que quatre tubercules sur le premier anneau, de 

 meme que sur le dernier, tandis que les intermediaires en ont chacun 

 six." It is also figured in Hubner's Schmetterlinge. 



3ir YS. VTTT 



• ym 



3 



Figure 1, A, represents a dorsal view of the end of the body of the 

 larva of Saturnia carpini ; B, the end of the body of S. pyri, copied 

 from Duponchel. 



* We copy Mr. Edwards's description of this larva, to show that the same 

 characteristic of six tubercles on all the abdominal segments 1 to 8 occurs in the 

 Pacific coast species of the genus : — "Full grown. Head small, rough, purplish 

 brown, somewhat withdrawn into the second segment. Ground color of the 

 body, pale yellowish green. On the second and anal segments are four tubercles 

 each, bright orange-red, with black hairs springing from them, and on each of 

 the other segments are six similar tubercles, those of the anterior four being the 

 largest. Head and body thickly clothed witli whitish hair. Laterally there is 

 a pale yellowish fold above the spiracles, which are orange with a darker 

 ring. Feet and under side purplish brown. Length 2.25 inches. Food plant, 

 Ardistophijlus tomentosa." 



