Packard ] Iw [March 17, 



much larger. This is due, perhaps, to its sluggish life, greater digestive 

 and assimilative powers, so that a rapid acceleration of the growth of the 

 body lakes place ; owing to its protection from the attacks of birds it may 

 feed openly and continuously. It is thus like Sphingid and Attacine lar- 

 vae in its huge body and enormous appetite. The largest Cochliopod larvae 

 are the spiny ones, and the spiny or tuberculated Saturnians and Atta- 

 ciucC have thick, large bodies. 



FAMILY HEMILEUCID^. 



Notes on the Early Stages of Hyperchikia io (Fabr ). 



At Brunswick, Me., the eggs were laid in confinement, June 5-7, and 

 the larva hatched June 25, or about three weeks afterwards. Another 

 year, larvoe in the second stage were observed July 16. For an excellent 

 but brief description of all the stages see Riley's Fifth Rep. Ins. Missouri, 

 135 ; also Lintner's Entomological Contributions, ii, 146. Both authors 

 state that there are six stages. 



JSgg. — Length, 1.8 mm.; width, 1.4 mm. It is regularly oval-cylindri- 

 cal in form and slightly flattened", yellow during early embryonic life, 

 ■with sometimes an orange spot on each side. Under a high-power triplet 

 the surface of the shell is seen to be very finely granulated (not smooth 

 and shining), and under a one-half-inch objective the surface is seen to 

 be divided into close-set, very small, slightly raised but flattened areas, 

 separated by narrow valleys ; the areas are very irregular, but often are 

 somewhat polygonal in outline. 



Larva, Stage J. — Length, 5.5, when freshly hatched ; the head, 0.8 

 mm. in width. The body is uniformly yellowish brown ; the head and 

 spines are dark, blackish brown. All the feet, both thoracic and abdomi- 

 nal, are of the same color as the body. The spines are in four rows, i. e., 

 there are eight on each segment, except on those bearing the abdominal 

 legs, when the smallest or infraspiracular ones are wanting. The eversi- 

 ble glands are well developed ; a pair on the first and a second pair on 

 the seventh abdominal segment ; they are situated behind the spiracle of 

 their segment and between the subdorsal and spiracular row of spines. 

 The spiracles are very small and hard to detect in this stage. The sub- 

 dorsal spines are about as long as the body is thick, the dorsal ones a little 

 thicker and longer; they end in usually fine setce, one of which is finely 

 barbed about as long as the spine itself. Both the subdorsal and dorsal 

 spines of the three thoracic and of the eighth and ninth abdominal seg- 

 ments are deeply forked, the forks of equal length and each bearing the long 

 bristle as well as four or five short ones. Those of the other segments are 

 not forked. The first thoracic dorsal and subdorsal spines are as long and 

 large as those on the two hinder segments. The spines are represented 

 in Fig. 6. 



Fig. 6 represents the freshly hatched larva, drawn with the camera, 

 with the lateral, eversible glands (g). 



