918 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



black spot, like the eye in a peacock's feather. To describe the wing and its mark- 

 ings more fully — the basal half of the wing is white, unspotted, except a short, trans- 

 verse brown band, extending from the inner edge, not quite to the middle of the 

 wing. On each side of this band is a row of two or three minute dots. The middle 

 baud is broadest on the hind edge. Beyond and arising from the costa, where they 

 are broadest, and extending to the opposite side of the wing, are six brown lines, 

 alternating with white interspaces. These lines run together in the middle of the 

 wing, brown dots being added, but which end as distinct lines on the inner edge of 

 the wing. The three outermost lines are much curved, and, with the curve of the 

 fringe, form a circular area, in the middle of which, on the base of the friuge, is the 

 curvilinear, rather thick, dark brown spot. The long fringe on the end of the wing 

 is white at base and brown at the end. The hind wings are pale brown, acutely 

 pointed, with a long silvery fringe. The tibije and tarsi of the fore legs are brown- 

 ish, while the hind legs are white, with a long fringe on the hindermost tibiae. The 

 length of one forewing is .18, and the length of the body is .13 inch. 



The cocoon is white, tough, dense, slender cylindrical, and ,20 inch in length. It 

 is fastened by one side to the leaf, and differs from that of the apple Bucculatrix in 

 not being ribbed longitudinally. A minute, beautifully brilliant green ichneumon 

 (Chalcis) fly seems to attack in considerable numbers the chrysalids of this insect, as 

 nearly half of those reared by me turned out one of these parasites. It is a species 

 of a genus allied to Eulophus, having the antennae pectinated, the terminal joints 

 throwing off five long branches. It differs, however, from Eulophus among other 

 characters by having a short, thick body, a small, conical abdomen, and short, thick 

 antennae. The forewings are broad, triangular. 



We noticed these beautiful moths again in 1881, at Brunswick, flying 

 about a cedar hedge in considerable numbers from the middle of July 

 until early in August. 



2. The bag-worm. 

 Thyridopteryx ejyhemermformis, Haw. 



Fig. 305. — The Bag-worm, (Thyridopteryx ephemerceformis Haw.) 

 a, Larva, fully grown ; b, male chrysalis ; c, female moth : d, male 

 moth ; e, bag containing female chrysalis, with eggs ; /, fully grown 

 larva carrying its bag; g, young worms in their cases. 



The general abundance of this pest upon cedars and some other trees 

 in southern Illinois calls for special mention. The small conical bags, 



