IOWA ACADEMY OF SCIENCES. 
165 
pseudovitellus is not as regular as in other species, especially 
A'plialora polygoni, often being broken up into a number of parts, 
and these parts on each side more unequal than usual. Legs 
well developed^ quite distinct from above, but ordinarily only 
the tarsi projecting beyond the wing-pads. 
Therp is a distinct longitudinal dorsal black band extending 
the full length of the body. Its width is about equal to half 
the width of the head between the eyes. On the abdomen it 
expands somewhat, becoming rather oval in outline, contract- 
ing again a short distance before the tip of the abdomen, which 
is slightly tipped with black. In the middle of this band there 
is a distinct, clear, longitudinal line extending from the anterior 
lobe of the head to the first or second abdominal segment. 
In the full grown larva this line extends still farther back, 
reaching the fourth segment. 
As the larvae grow older, all the parts become more distinct. 
The antennae project beyond the head, the longitudinal black 
band becomes somewhat irregular, but more intense in places; 
the head, thorax and wing-pads dark-colored, varying from 
smoky to brownish. 
In the full grown larva the head and prothorax are closely 
united, about equal in length, half as long as broad, and together 
are subquadrate in outline. The mouth- parts are distinct, 
strongly held by the prosternal lobes, tip of last segment black. 
The antennae project about half their length beyond anterior 
margin, but do not show the joints very plainly, as those in the 
club are simply indicated by constrictions as in the other 
species. Mesothorax and metathorax distinct, dark color quite 
intense and shows several light colored portions. (See plate xv, 
figure 8.) 
The abdomen presents five large, usually roundish, light- 
colored spots on either side, the anterior the smallest and not 
so distinct. Between each one of these spots is a dark band 
extending inward and slightly forward toward median dorsal 
band. In some cases these little bands are rectangular, in 
others triangular with the points turned inward. When the 
bands between the marginal abdominal spots are rectangular, 
their inner ends are usually blended, thus forming a crescent- 
shaped band on either side of the median longitudinal band, 
leaving a light-colored space between them. 
The color markings are somewhat variable, depending on the 
age of the larva and the length of time after moulting. 
