eee 175 
The newly hatched larva (Fig. 14, b) is from 3 to 4 mm. long, rather 
slender and elongate and tapering gradually from the head to the last 
segment; head yellowish, eyes black. Full growth is attained in about 
five weeks. The mature larva (ig. 14, ¢) has a length of from 17 to 20 
mm. and has the general form of the newly hatched larva. The head is 
considerably less in diameter than the first thoracic segment and is of 
a pale clay yellow with a greenish tinge and with the surface slightly 
reticulated; the eyes are black and surrounded by a narrow dark brown 
ring. The mandibles are tipped with brown. The color of the body is 
ereen or yellowish green, with the alimentary canal showing through 
the semitransparent dorsum as a line of darker green. A whitish line 
Fic. 14.—Nematus marylandicus Norton: a a, eggs in wheat blades; 6, young larve; c, full-grown 
larva; d, cocoon from which an adult has emerged; e and f, adult insects—e, male; f, female; a and b, 
natural size; cto f, enlarged (original). 
crosses the stigmata, which are very small and light brown in color. 
The head and body below the stigmata are armed with minute hairs, 
which are light colored except on the last segment, where they are 
prominent and brownish. 
The larva of this insect is at once separated from the Dolerus larva 
by the possession of but seven pairs of abdominal feet, in which respect 
it agrees with a large group of Tenthredinid larve (Nematine), includ- 
ing the genus Nematus and its allies. 
The larve at first feed together as shown in the illustration, but 
Separate and are practically solitary later. They feed on the wheat 
blades and have not been observed to cut off the wheat heads, though 
there is little doubt that they will do so, since the stalk just beneath 
the head remains green longest. 
12201—No. 5 2 
