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'liiner, of 

 Illinois, specimens of the larva, pupa, and adult of this pretty insect ( CalUdiiim amcenmn 

 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 aa the prothoracic segment. This latter, be- 



FiG. 24.— Grape Phymatodes: a, larva, 6, 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 long 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, wliich is of equal width throughout, the end sud- 

 denly rounding off; the terminal tliree 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 (epicrauium) 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 long, while the minute 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 subtriaugular 

 fleshy area. The chin (mentum) is square, not much longer than broad. The under 

 lip (labium) is one-half as long 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. Tlie maxillary lobe is large and broad. 



