Paeluud.] 1/U [March 17, 



median double one on Uie eighth abdominal segment is thicker than the 

 single ones in front, also higher, and ends in two spines ; the lateral 

 spines are much more numerous than those in front. The spines of the 

 subdorsal series are alike on both the thoracic and abdominal segments. 



Last Stage. — The shape of the dorsal spines of the larva in its tinal stage 

 is represented by Fig. 10. I, a prothoracic dorsal spine, ending in two 

 equal terminal piliferous spinules, with seven or eight just below it, 

 ■while at and near the base are the long, pale spines, each ending in a 

 sharp black point ; IT, one of the second thoracic dorsal spines, the base 

 short, bulbous, with very numerous radiating spines, and a single ter- 

 minal, central piliferous spine, with a smaller one near it ; III, a bush- 

 like dorsal spine of the third thoracic segment, no piliferous spinules 

 present. The abdominal dorsal spines are all on the same type.* The 

 median spine on the eighth abdominal segment is about twice the size of 

 the other dorsal single ones in front, though no higher, and it spreads 

 more, having about twice as many spines on the sides. On the ninth 

 segment are two dorsal and two subdorsal ones, and behind these four on 

 the same segment is a median one. These types are already attained in 

 Stage II, though the spinules are fewer in number. 



It is to be noticed that the characters of the full-fed larva appear in large 

 part in Stage II, and are almost fully developed in Stage III. 



Fig. 11 represents the spiracle and lateral eversible gland of the full-fed 

 larva ; g, the eversible gland ; «^?, spiracle ; g', an eversible gland, en- 

 larged. 



In the large dark (in alcohol) larva of Ilyperchiria, or perhaps of a 

 Gamelia, referred to by me in Proc. Bost. Soc. Nat. Hist., xxv, 91, the 

 dorsal spines of the three thoracic segments are represented bj^ Fig. 12. 

 I, a prothoracic ; II, one from the second thoracic ; III, one from the 

 third thoracic ; VII, one from the seventh abdominal segment. It will be 

 seen that the spines of this species are rather more generalized than in 

 the mature H. io, and approximate those of the second stage of that 

 species ; the dorsal spine of the third thoracic segment ending in three 

 piliferous spinules, there being no piliferous spinules at all in the homolo- 

 gous spines of //. io ; the abdominal spines also (VII) ending in three 

 piliferous spinules, though the other spinules are much (about one-half) 

 less numerous. 



Intermediate between those of H. io and the Mexican species is the 

 nemileuca artemis, from Las Cruces, New Mexico (Fig. 13), in which the 

 prothoracic dorsal spine is lilie the Mexican form, the second thoracic 

 dorsal spine like the prothoracic ones of U. io, and the third thoracic 

 dorsal tuft like the second dorsal one of Ilemileuca yavapai from Arizona 

 (Fig. 14). In this last species the dorsal tufis of the body, as a whole, are 

 intermediate between H. maia and //. io, but as regards the second 

 and third dorsal and tlie dorsal abdominal ones, it approaches much 



*The spines have been somewhat flatteued in the auiiualcule box, but have been 

 drawn with the camera. 



