32 HAWK-MOTHS. 
over two inches in length; it tapers greatly from the fourth 
segment to the head, but there is a slight enlargement of 
the third and fourth segments which increases with every 
moult. It is of a uniform pale yellowish-green color, or 
chocolate-brown, dotted with numerous dark-umber points, 
but especially along the dorsal line; two light longitudinal 
subdorsal lines extend straight from the head to the eleventh 
segment, thence curving to the caudal horn. ‘There are also 
eight lateral or stigmatal stripes of dark umber; the caudal 
horn is very short, black-ochre or reddish-brown at the 
base, tapering abruptly, and often carried in a line with the 
back. The caterpillar is rather sluggish; at rest it stretches 
itself at full length along the leaf or leaf-stem, very. much 
like the larva of the Abbot Spinx described later. When full 
grown it transforms to a dark-brown pupa under the rub- 
bish on top of the ground. 
THE ABBOT SPINX. 
(Thyvreus Abboti Swains. ). 
This interesting insect is not common in Minnesota, but 
occurs only occasionally upon our cultivated and wild 
grapes, as well as upon the Virginia creeper. The caterpillar 
reaches its full size early in August, when it measures almost 
two inches in length. It varies considerably in color and 
appearance. Usually it.is of a dull yellow or reddish-brown, 
each segment being marked transversely with six or seven 
fine black lines, and longitudinally with dark brown patches, 
giving the caterpillar a checkered appearance. The under 
side of the caterpillar is yellowish, with a pinkish tinge be- 
tween the prolegs. The head is slightly roughened and dark, 
with a lighter broad band each side, and a central x-shaped 
mark down the middle. This caterpillar does not possess 
the usual caudal horn like the other larva of the Sphingide, 
having in its place a polished black tubercle, ringed with 
