313 



and in pairs, and two on the eleventh ring. The head is large, and some- 

 what cordate above, polished black. 



Sept. 15, began to enclose itself, and made a tough cocoon in a box. 

 Winged June 10, 1842. 



Found two more larva? on a fence under elm trees, Sept. 8 ; cocoon made 

 Sept. 12; winged June 11. 



Aeronycta americana Ilarr. MSS. [PI. in, fig. 2.] 



Sept. 20, 1841. Found at Lowell. Would not eat willow, poplar, or 

 lime leaves. 



Greenish brown, or nearly black; head subquadrate, bifid above, chest- 

 nut brown; each segment above with a transverse, oval, greenish yellow spot, 

 having a transverse, depressed line in the middle; about four elevated, black 

 dots on each side of each ring; and the body beset with a few long, black 

 bristles dilated at the end ; feet black. The segments have deep incisions 

 between them ; the long, black, spear-headed hairs grow from the skin and 

 not from warts ; there are two longer than the rest on each side of the 

 yellow spot on the first ring, and one on each side of the spots on the 

 fourth to the ninth rings inclusive, and the same on the eleventh and 

 twelfth rings ; but there are none on the second, third and tcmth rings. 

 The spiracles are black. This caterpillar moves very quickly, and rests with 

 the fore part of its body bent sidewise. 



Chrysalis under a leaf, fastened to another with a few threads, Sept. 25, 

 1841. Winged June 28, 1842. 



Aeronycta pruni Harr. MSS. [PL iv, fig. 13.] 



August 0, 1828. Found on ground; perhaps comes near the genus 

 Episema. See Ernst, 180, fig. 242. 



Color brownish purple. Head white spotted with black. Body sub- 

 tuberculate; tubercles setiferous ; hairs black. A dusky dorsal line. First 

 segment with two obsolete tubercles near the anterior edge. Two dorsal, 

 golden yellow lines diverging before, and inclosing a dark brown spot. 

 Second segment with two similar yellow lines, continuous with the first and 

 second dorsal tubercles; remaining segments each with two contiguous, 

 dorsal tubercles (and on each side one minute or obsolete tubercle) of a, 

 yellowish color. The dorsal tubercles are longest on the last segment, and 

 next in length on the second, from which they gradually diminish till they 

 become obsolete on 'the sixth. The lateral tubercles are obsolete on the 

 second segment, but gradually become larger and more apparent on the 

 sixth and remaining segments. Immediately in front of the dorsal tuber- 



