THE AGR1LUS RUFICOLLIS. 
By Prof. S. S. Haldeman. 
Plate, Fig. I .—This little insect, so hurtful to the raspberry, is 
about three inches long ; black, minutely punctured, thorax and 
front brassy ; front with a vertical impression ; a wide shallow im¬ 
pression across the thorax posteriorly, and another at the base of the 
elytra. In this particular case, the knowledge of the appearance 
of the insect is not essential, as far as the means of preventing its 
depredations are concerned, although it is always interesting to 
know whence an injury proceeds. 
In its larva state, Agrilus ruficollis lives at the expense of the cul¬ 
tivated Rubus (raspberry), in the heart of which the pupa may be 
found in the month of May, the imago appearing in June. The lar¬ 
va bores between the wood and the bark, injuring the plant, and 
causing a wide, unsightly excrescence. It next penetrates to the 
pith, which it traverses for two or three feet, finally excavating a 
cavity in which it undergoes its transformations. 
It is probable that the larva feeds during summer and autumn, 
and passes the winter in the pupa state. The diseased stems are 
readily recognizable, and should be cut out and burnt in autumn, or 
early in the spring. The perfect insect is sometimes found upon the 
na'ive Rubus villosus, which renders it probable that this genus of 
plants constitutes the natural food of the larva. 
