114 
the body flattened, obtuse, and nearly as wide at the end as at 
first abdominal ring. The head is one-half as wide as the ] 
thoracic ring, being rather large. The prothoracic segment, or t 
next to the head, is transversely oblong, being about twice as br 
as long; there is a pale dorsal corneous transversely oblong shi 
being about two-thirds as long as wide, and nearly as lon^ 
the four succeeding segments; this plate is smooth, except on 
posterior half, which is rough, with the front edge irregular 
not extending far down the sides. Fine hairs arise from the li 
edge and side of the plate, and similar hairs are scattered over 
body and especially around the end. On the upper side ot e 
segment is a transversely oblong ovate roughened area with 
front edge slightly convex, and behind slightly arcuate. On 
under side of each segment are similar rough horny plates, 
arcuate in front, with the hinder edge straight. 
The beetle resulting from this larva is of a dark brown color, ; 
a tint of gray, owing to a thin coating of very short down, 
ornamented with a curved line behind the eyes, two stripes on 
thorax, and a three-toothed or three-branched stripe on the c 
edo-e of each wing-cover of a rusty red color, lhere are alsc 
black dots on the thorax, two above, and two on the sides ; 
each of the angles between the branches and the lateral stripe 
the wing-covers is marked with a blackish spot. The two hr 
branches are oblique, and extend nearly or quite to the suture; 
anterior branch is short and hooked. Its average length is a 
half an inch; but it varies from four to six-tenths of an inch, 
males are smaller than the females, but have longer antennae. 
From the present appearance of the elms throughout the t< 
of Central Illinois where I have had an opportunity to exa^ 
their condition, and from the rapid progress which this pest lias i 
among them during the last two or three years, it seems extre 
likely that it will totally exterminate the trees unless it be pror 
arrested by general action. The only remedy available is urn 
tionably the destruction of affected trees in autumn and wmte 
fore the beetles have a chance to emerge from the trunks. In t 
this measure should usually be taken by the authorities, since 
vidual action could not be depended on to more than palliaft 
difficulty. If every elm which is in the unhealthy condition i 
described, and which, upon examination, is found to liaiboi 
borers beneath the bark, w 7 ere cut down in autumn and bmne 
fore spring, the multiplication of the borer might be cnee 
checked; but if the destruction of the trees be postponed un 
late as May, a part of all of the beetles maturing each year a 
escape to carry the mischief elsewhere. 
2. The Elm Plant Louse. 
(Schizoneura rileyi, Tlios.) 
Order Hemiptera. Family Aphidihe. 
Finding an elm at Normal seriously infested by this louse 
apparently upon the point of death from the effects upon its to 
