52 
pressed transverse lines, whereby it is divided into_ ten or twelve 
segments of equal length, except at the ends where it is difficult to 
definitelv distinguish them. It is of a rich yellow color varying i n 
different individuals from lemon to orange-yellow, and usually a 
small greenish or blackish cloud is seen placed lengthwise in the 
middle of the body on its under side, which is evidently caused by 
internal alimentary matter. 
The moving larva is of a more elongated and elliptic form, taper¬ 
ing to an acute point at its fore end and much more blunt behind. 
Thirteen segments are now plainly to be seen. Of these the three 
first and the last have a smooth surface and are whitish and semi¬ 
transparent, only the nine intervening opes being yellow and with 
their surface granulated. Each segment is fringed at its end with a 
row of small hairs like eyelashes, which are continued along the 
whole length of the edge. The head is conical, longer than 
broad, tapering to an acute point in front, and has a depression on 
each side near the middle where is inserted a short thread-like pro¬ 
cess, forming with its fellow a pair of horns, which are articulated 
at their bases. The last segment is cut off transversely in a straight 
line; but as the worm crawls, when it draws the hind part of its 
body forward with each step it takes, this hind end becomes strongly 
concave. When the worm is dry and endeavoring to crawl on a dry 
surface, this end of its body becomes wholly different. It is then 
strongly concave, its angles acute and tooth-like, with two similar 
teeth between them which may be of the same size or retracted, 
showing their points only. On each side of this last segment a 
rounded tubercle is sometimes protruded from beneath, bearing a 
conical point and-resembling a proleg. Under the same circum¬ 
stances the head is wholly retracted, leaving only the ends of its 
horns visible. 
Pii Va .—The cocoons in which the larvae enclose themselves resemble 
little round grains smaller than a mustard seed. When coated 
with dirt, as they usually are, it is almost impossible to discover 
these cocoons even with the aid of a magnifying glass. The naked 
larvae that are sometimes found in the earth in the spring are 
doubtless those which remained in the wheat after its harvesting. 
Imago .—The following remarks condensed from Fitch’s Report 
will constitute a sufficient description of the imago to enable the 
intelligent observer to recognize it, especially when taken in con¬ 
nection with the figures, copied on a larger scale from Fitch s plate. 
The individuals of this species differ so widely as to color, size, 
and perfection of organs and members, that no study of those 
points will enable one to distinguish this fly from other species 
when specimens are gathered in other situations than on whea. 
We can then recognize it only when it shows the following essential 
characters: 
The body nearly one-tenth of an inch long, bright orange or 
lemon-yellow, and tarnished or slightly smoky on the back, forwar 
of the wings; the wings clear and glassy and having a small cross 
vein near their base; the antennas about as long as the body am 
composed of twelve oblong joints which are narrower in tiieu 
middles and separated, by short pedicels. 
