ARGYNNIS VI. 



After fifth moult : length 1 inch ; at from fourteen to twenty days from the 

 moult was fully grown. 



Mature Larva. — Length 1.4 inch at rest; greatest breadth across middle 

 segment, .3 inch ; cylindrical, of even thickness from 5 to 11, each segment 

 rounded ; color velvety black ; the spines disposed as in the genus, long, slender, 

 tapering ; the dorsals on 2 directed forward, but are not longer than the others ; 

 all are beset with many short black bristles ; those of dorsal rows are greenish 

 brown at base, except on 3 and 4, where they are dull yellow ; those of second 

 and third, as well as the intermediate row, are dull yellow at base and halfway 

 up, the tops black ; under side and prolegs brown, the feet black ; head sub-cor- 

 date, flattened frontally, the back rounded, the vertices conical, each at top bear- 

 ing a little process or sharp tuberculation which is turned forward ; on the face, 

 many fine, short, black hairs ; color black, the back either reddish yellow or dull 

 yellow, individuals varying (Fig./) . From fifth moult to pupation from twenty- 

 two to thirty-three days. The length of the several stages depends somewhat 

 on the state of the weather. 



Chrysalis. — Length 1 inch, breadth across mesonotum .33 inch, across 

 abdomen .3 ; greatest depth .36 inch ; cylindrical, somewhat compressed later- 

 ally ; general shape of Ajjhrodlte, but more slender ; head case nearly flat at 

 top, rounded, the curve being almost equal on dorsal and ventral side, a minute 

 sharp tuberculation at each corner, the sides incurved ; mesonotum prominent 

 (as in the sub-group), carinated, the sides convex, followed by a deep rounded 

 excavation ; the wing cases flaring at base, compressed in middle dorsally, ele- 

 vated ventrally, curving to the abdomen ; this is conical, and shows two rows of 

 tubercles which correspond to the dorsal tubercles of the larva, and extend to 

 mesonotum and head case ; a row of small ones on side, and another, more or 

 less complete, below the spiracles ; the whole surface finely corrugated ; color 

 red-ljrown, irregularly mottled black, the wing cases black along the nervules, and 

 with a black patch on disk (Fig. g). Duration of this stage about twenty days. 



Alcestis flies in southern Michigan, northern Indiana, and Illinois, in Iowa 

 and Nebraska. It seems to be limited to a narrow belt of latitude, and is there- 

 fore vastly more restricted in its range than the allied species Cijheh and Ajikro- 

 dite, with which it associates. Mr. Worthington, in the paper above cited, says it 

 is abundant on the prairie west and north of Chicago, in July and August, but 

 seems to be local, " as examples taken a few miles north, in a timbered region, 

 are almost uniforndy Ajj/trodite." He adds, " I have been greatly surprised at 



