324 ENTOMOLOGICAL NEWS. [Oct. , '07 



Anal region noticeably punctured and with a few very small hairs 

 between the anus and the lower margin of the eleventh sub-dorsal horns. 

 A few scattered simple spines are present on the sides below the lateral 

 horns. Duration of instar, four to five days. 



Third Larval Instar. — Length, at rest, 3H to 4 mm. ; in motion, about 

 Yz mm. greater. Head and body much as in the previous instar. Color 

 deeper yellow. First sub-dorsal horn about 4/5 mm. long, nearly 

 twice as long as the second and third. Fourth to eighth inclusive very 

 short; ninth and tenth longer; eleventh nearly as long as the first. 

 First lateral, short; second, about like the first sub-dorsal, third to 

 seventh inclusive, very short; eighth longer; ninth nearly as long as the 

 last sub-dorsal. The spines near the bases of the horns are shorter than 

 those nearer the tips. Duration of instar 4^2 to $ l A days. 



Fourth Larval Instar. — Length at rest about 6 mm. ; in motion, about 

 754 mm - Annulations of the body are now well pronounced. Sides of 

 head darker than hitherto, with a median lighter area. General .color 

 greenish yellow. Along the mid-dorsal line is a white band extending 

 from the sixth to tenth segments inclusive, external to which is a 

 green stripe reaching from the fourth to the tenth segments. Between 

 the bases of the sub-dorsal horns is an opaque yellow band, and between 

 these and the lateral horns is a white longitudinal stripe. 



The horns themselves appear to differ little from their condition in 

 the preceding instar. 



Duration of instar, 5 to 6 days. 



Fifth Larval Instar. — Length at rest, about 9 mm. ; in motion, about 

 ioJ4 rrnn. As in all the preceding instars the color is at first nearly 

 uniform, with only faint traces of the markings which later become more 

 prominent, the spines becoming much darker. General color of the 

 larva when it has become pronounced, pale yellow. The stripes become 

 like those of the last stage, except that the green band is hardly per- 

 ceptible and the yellow between the sub-dorsal horns is darker. In 

 this instar the fourth sub-dorsal horn is much reduced ; the fifth, sixth 

 and seventh are small, but increase in size posteriorly; the eighth is 

 smaller than the seventh, the ninth is three-quarters the size of the 

 first, the tenth much shorter, and the eleventh equal to the first. The 

 first, second, third and ninth grow darker toward their tips. Relative 

 length of the lateral horns as before. Spines somewhat darker after 

 the color has fully developed, than in the previous instar, each now 

 showing two parts plainly ; a longer, stout part, and a slender outer end 

 which easily breaks off and causes an irritation worse than that from 

 Automeris io, if it touches the skin. These tips vary in length, some 

 being quite long, others short. Duration of instar, 5 to 6 days. 



Sixth Larval Instar. — Length at rest, about 12^ mm. ; in motion, 

 about 1354 mm. General color, pale yellow, but with its colored areas 

 much more pronounced than heretofore. Head quite strongly bilobed, 



