OAK-BORERS. 
75 
found at Providence, May 30, 1862, by Mr. George Hunt, under the bark 
of the oak (not the white oak); the beetle appeared June 8. We add 
the following description of the larva of a closely allied species, P. 
amcenus, Fig. 24, which injures the trunk of the grape: 
The larva of the Grape Phymatodes. — Several years ago I received from Dr. S'liraer, of 
Illinois, specimens of the larva, pupa, and adult of this pretty insect (Callidium ameenum 
of Say), which is not uncommon in our own State. So much alike are all the borers 
of this family of long-horned beetles that long and prolix descriptions and carefully 
drawn figures of the mouth parts (wherein most of the differences lie) are absolutely 
necessary for their identification. 
The larva (Fig. 24, b, head seen from above; c, seen from beneath) has a small head, 
which is a little mor>; than half as wide as the prothoracic segment. This latter, be- 
Fig. 24.— Grape Phymatodes: a, larva, b, upper side; c, under side, of 
head of larva much enlarged.— From Packard. 
ing the segment immediately succeeding the head, is half as long as broad, with a 
distinct median suture and four chitinous patches; the two middle ones transverse 
and irregularly oblong, being about twice as broad as long, the outer spots being lon- 
gitudinal to the segment, and oblong in form, or about twice as loug as broad. The 
three segments succeeding are of nearly equal length and width, being about half as 
long as the prothoracic segment, and not much narrower. The body decreases in 
width towards the posterior half, winch is of equal width throughout, the end sud- 
denly rounding off; the terminal three segments are indicated by very slightly- 
marked sutures, and together form a straight cylindrical portion nearly as long as the 
three segments in advance of it taken collectively. The body is slightly hairy, with, 
a few fine, pale hairs on the top of the segment next behind the head. The basal 
portion of the head (epicranium) is broad and smooth, with a few hairs on the edge. 
The eyes are two small black dots, each situated a little behind the base of the an- 
tennae, and in a line with them. The frontal piece (clypeus) is very small, about 
three times as broad as loug, while the miuute upper lip (labrum) is two-thirds as 
long as broad ; they together form a somewhat triangular portion resting on the 
inner edge of the mandibles, which are broad and short, the ends broad and square, 
and blackish in color. The antennae are not quite so large or as long as the maxil- 
lary palpi ; they are four-jointed, the first joint being thick, the second joint a third 
shorter than the third, while the fourth joint is filiform and about as long as the 
second joint. The under side of the head is chitinous, with a mesial snbtriangular 
fleshy area. The chin (mentum) is square, not much longer than broad. The under 
lip (labium) is one-half as loug as broad. The labial palpi are three-jointed, the 
basal joint being one-half as long as the second ; the third joint is minute, short, and 
' hairy. The maxillary palpi are four-jointed, the first joint being twice as thick as 
the third, the second and third are of nearly equal length, while the fourth is slender 
and nearly as long as the second or third. The maxillary lobe is large and broad, 
