128 JOHN B. SMITH. 



tuft yellow ; the lateral tufts are brown. Primaries dull brown, paler beyond 

 the middle to the terminal space; more evenly colored in the J. An oblique 

 black line, heaviest at its inception on inner margin about one-third from base, 

 narrowing evenly to its termination on costa at about the middle of the wings. 

 Five blackish lines from the middle of inner margin outward, curving strongly 

 toward outer margin and lost above the middle of wing in the long blackish spur 

 in the interspace between veins 5 and 6 ; above this the lines are again traceable, 

 but indistinct and very strongly dentate. The terminal space is dull brown, 

 with blackish spots of variable sizes on outer margin above the angle on vein 

 4- Discal dot minute, blackish. Secondaries bright yellow at base, with a brown 

 outer band, toward anal angle broken up into interrupted blackish bands. Be- 

 neath, paler throughout. Primaries yellowish at base, with a yellowish trans- 

 verse shade at outer third, through which runs a strongly dentate blackish line. 

 Secondaries yellow at base, costal region powdered with brownish, with a broad 

 lirown outer margin and two dentate blackish lines, the inner incomplete. Ex- 

 pands 2.30 — 2.60 inches ; 57 — 65 mm. 



Hub. — Canada, Eastern United States, westward to Iowa. 



One of the most characteristic and easily recognized forms of the 

 family by the broad, heavy body, the lateral tuftings of abdomen, the 

 narrow, short primaries and yellow secondaries. The antennse are 

 yellow. 



The life history of the species has been known since it was first 

 described, and nearly every writer has either originally or following 

 others, described the larva. Prof. Riley's figures have made both 

 insect and larva well known everywhere since they have been used 

 in almost evei"y subsequent work dealing with this species. 



Clemens says of the larva that its jjosition when disturbed is not 

 Sphinx-like ; it shortens the anterior rings and throws the head from 

 side to side, making at the same time a crepitating sound. When on 

 the ground its motions are often violent. 



The larva varies considerably, and for quite a time it was consid- 

 ered that the two most diverse forms indicated sexes. However, it 

 has been proved that both sexes are produced from each form of the 

 larva, and that the theory of sexual modificaticm in the larva is a 

 mistaken one. 



DEIDAIfllA Clem. 

 Jouru. Ac. N. Sci. Phil, iv, 137, 1859. 



Body quite fusiform. Head small, retracted, laterally compressed, 

 with a distinct crest between the antennse; palpi small, shaggy, not 

 attaining the vertex ; eyes rather small, round, with hairy lashes. 

 Antennie fusiform, tip pointed, but slightly hooked, without seta ; 

 biciliate in the % , simple in the 9 ; tongue rather more than half 



