250 
REPORT-OF THE COMMISSIONER OF AGRICULTURE. 
injuries of this clover pest, and no other mode of prevention suggests — 
itself to my mind than the plowing under of the clover in the spring of 
the second year, if the presence of the beetle is observed. 
There exists another species of Hylesinus in this country so closely 
allied to trifolii that the two are easily confounded. The species in 
question was described by Dr. Le Conte as opaculus in 1865,* and has 
been found infesting Elm and Ash, by Mr. E. A. Schwarz. 
The Clover- 
root borer has been considered synonymous with opaculus,t but a eriti- 
cal examination shows the following pretty constant structural difference 
between the two: 
DIFFERENCES 
between 
Hyjlesinus opaculis, Le Cente, and 
Stont, opaque; when mature of 2 uniform pice- 
ous-black color. (Pl. V, Fig. 3, a.) 
Head punctulate, not narrow in front, without 
transverse impression in front of eyes. 
Epistoma (Pl. V, Fig. 3, 6) truncate or very 
slightly and broadly emarginate. 
Labram visible. . 
Antennial club very large, oblong-oval, less solid; 
the two first joints shining and pubescent only at 
apex. 
Thorax wider than long, very densely punc- 
tate; pubescence moderately thick and short. 
Elytral strie (PI. V, Fig. 3, d) evidently im- 
pressed and regularly, coarsely punctate; imter- 
stices very distinct, each with a regular row of 
small tubercles, which becomes more acute toward 
the apex and the sides. 
Pubescence very coarse and short. 
Tibiw (Pl. V, Fig. 3, c) hardly dentate. 
Ei. trifolii, Muller. 
Smaller, more slender, elytra somewhat shining; 
when matare piceous-black, elytra more or less 
reddish-brown. (Pl. V, Fig. 3, e.) 
Head more strongly, rugosely punctured, with 
a transverse impressicn in front of eyes and nar- 
rowed in front. 
Epistoma (P1. V, Fig. 3, g) tri-sinuate and con- 
sequently bidendate at middle; median sinuation 
sometimes [in the male ?] triangular. 
Labrum not visible. ; 
Antennal club much smaller, oval, solid, en- 
tirely opaque, and pubescent. 
Thorax as wide as long, more coarsely, rngosely 
punctate; pubescence very sparse but long. 
Elytral striw (Pl. V, Fig. 3, 7) hardly impressed 
and very coarsely punctate; interstices mu¢h less 
distinct, coarsely, rngosely punctate. 
Pubescence much finer, sparser, and longer. 
Tibia (PL. V, Fig. 3,2), with large teeth at outer 
apical edge. 
Lives in the roots of clover. 
Lives under dry bark of elm and ash trees. 
That this insect also has its natural enemies, however insufficient they 
may be, is proved by the fact that I found preying on it a Telephorid 
larva, which agrees with that of Telephorus bilineatus, Say, as already 
described by me.t 
DESCRIPTIVE. 
HYLESINUS TRIFOLH.—Larva—Of normal form and character. 
with the mouth parts brown; rest of body dingy white. 
Pupa—Length, 2.2™, characterized by having two minute spineus projections on to 
ue somewhat larger anal points. The thorax has a slight medio-dorsal carina, an 
risties. 
Length, 3™. MTHead, honey-yellow, 
ot head, and 
a few sparse 
THE CLOVER-SHED MIDGE. 
(Cectdomyta leguminicola, Lintner.) 
[Ord. DIPTERA; Fam. CECIDOMYID2.] 
While the Hylesinus just treated of was proving so destructive to the 
roots of clover in Western New York, the seed itself, where the beetle 
was not working badly, was very seriously affected by the bright orange 
larve of a minute two-winged fly, having both the size and general ap- 
pearance of the common Wheat midge (Cecidomyia tritici). 
Clover infested with these larve was first sent to me the latter part of 
last August by Mr. Snow, and, upon subsequently visiting Western New 
York, { had an opportunity of studying the species in the field. It seems 
* Trans. Am. Ent. Soc., 1868, p. 170. 
tProc. Am. Phil. Soc., 1876, p. 380. 
t4th Mo. Ent. Rep., 1871, p. 29. 
