438 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



It seeins to us most probable that this borer also infests ^he pitch- 

 pine, since we have seen these beetles flying at noon in abundance iv 

 the middle of July on the sandy plains of Brunswick, Me., among 

 pitch-pines, 2 or 3 miles away from any poplars ; and have captured 

 them among pines at intervals for twenty-five years past. 



Larva. — Average length when full grown, 3 inches. Color pale yellowish-white, 

 partly translucent, with glaucous and bluish shadings, and a distinct dorsal line of 

 the last color; 13 distinct segments. Segment 1 rather horny, somewhat longer than 

 2, 3, and 4 together, broadening posteriorly, slightly shagreened and whiter than the 

 rest of the body, with a rust-colored mark anteriorly, and a slight groove along the 

 middle. Segments 2 and 3 shortest and broadest, the body tapering thence gradu- 

 ally to extremity, though there is usually a lateral ridge on segment 12 which dilates 

 it rather more than the segments immediately preceding it. This segment 12 is also 

 the longest, the terminal one being quite small and divided into three nearly equal 

 lobes. A swelled hump crossed with two impressed transverse lines on segments 4, 

 6, 6, 7, 8, 9, and 10. Stigmata rust-colored, 9 in number, the first and largest being 



Fig. 163. — Larva of broad-necked Prionua. — After Riley. 



placed on a fold in the suture between segments 1 and 2. Head brown, verging to 

 black on anterior edge. Mandibles large, strong, black, with one blunt rounded 

 tooth, giving them a somewhat triangular appearance ; antennae 3-jointed and brown, 

 especially at tip; labrum fulvous, fuzzy and with a brown base; maxillary palpi 

 4-joiuted, the basal joint much swollen, the terminal joint brown, and a ring of the 

 same color at sutures of the other joints; labial palpi 3-jointed, the basal joint also 

 swollen, and the terminal joints and sutures of the others brown. Six rudimentary 

 2-jointed fuscous feet as shown at Fig. 163 tubercled as on the back, these tubercles 

 being especially prominent on segments 6, 7, 8, and 9, where they recall prolegs. The 

 young larva differs only in lacking the rust-colored mark on segment 1. (Riley, 

 Amer. Ent., ii, p. 232.) 



5. Buprestis fasciata FAhr. 



Mr. Fletcher reports (Canadian Entomologist, xv, p. 203) finding this 

 beautiful beetle common on poplars, and had found a larva in poplar 

 wood which he thought, from its appearance, might belong to that 

 species. 



6. Thk xyleutes borer. 



Xyleutes populi Walker. 



Nothing is known to us concerning this moth, except that the specific 

 name indicates that it occurs on the poplar. The habitat mentioned by 

 Walker, is St. Martin's Falls, Albany River, Hudson's Bay, the original 

 specimen described by Walker being in the British Museum. 



