100 ILLINOIS BIOLOGICAL MONOGRAPHS [100 



MACROHETEROCERA 



SUPERFAMILY BOMBYCOIDEA 

 Family Epiplemidae 



Head about as high as wide, slightly bigibbous, usually minutely ru- 

 gose ; front extending about half way to vertical triangle ; labrum moder- 

 ately emarginate ; no secondary setae. Prothorax bearing a dorsal plate 

 with the setae in the usual positions, epsilon cephaloventrad of rho above 

 spiracle ; Kappa and Pi groups each consisting of two setae ; mesothorax 

 and metathorax normal. Abdomen (Fig. 62) with kappa and eta at 

 about the same level below the spiracle, close together on segments 1 

 to 3, farther apart on segments 4 to 8; mu always associated with 

 lambda, an additional subprimary; Pi group represented by one seta on 

 segment 1, two setae on segment 2, four setae on the prolegs of seg- 

 ments 3 to 6, and one seta on segments 7 to 9 ; segment 9 with alpha 

 below level of beta and as far from it as from rho, Kappa and Pi groups 

 each represented by one seta. Prolegs with the planta semicircular, the 

 band of crochets so curved as to be similar to a penellipse, crochets bi- 

 ordinal. Spiracles elliptical, those of the prothorax and abdominal seg- 

 ment 8 twice as high and wide as those of the other abdominal segments. 



Four genera of this family are found in North America, only two 

 of them occurring east of the Rocky Mountains. In Callizzia inornata, 

 setae rho, kappa, and eta on segment 8 are about twice as far from the 

 enlarged spiracle of that segment as the spiracle is high, and the color- 

 ation consists principally of a dark band through the setae rho, shading 

 off to lighter brown above ; the ventral half of the body is pale ; the head 

 is smooth and shining. In Calledapteryx dryopterata, setae rho, kappa, 

 and eta are all closer to the spiracle than the spiracle is high, the color- 

 ation is paler and more indefinite, and the head is often coarsely rugose. 



Family Geometridae. 



Limits of time and space forbid a discussion of the "loopers" or 

 ''inch-worms". There seems to be sufficient variation in the armature, 

 setae, and number and position of prolegs to warrant the belief that a 

 separation of the genera is possible. As no other family has the pro- 



