^0 



FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



Fig. 32. — Elaphidion parallelum. 

 (After Smith.) 



It becomes a pupa either iu the autumn or spring. (Can. Ent., xviii, 13, 



1886.) In the absence of the larva of any 

 other species of this or an allied g^enus, for 

 comparison, we have corni)ared the larva 

 with that of Xylotrevhus colonus. 



Beetle. — Brown, punctured, covered with an ashy 

 woolly pubescence; elongated linear; antennse 

 scarcely shorter than the body ; second and third 

 joints with a terminal spine ; elytra parallel, trun- 

 cated at the apex and armed with a ^piue at each 

 angle, the outer spine rather long and incurved. 

 Length .55 inch. (Le Coute.) 



Larva. — The body very closely resembles X colonua, 

 but is larger and broader, especially on segments 7 to 

 9, but in general appearance is closely similar. Pro- 

 thoracic segment scarcely wider than the mesothoracic, but not so much swollen as in 

 Xylotrechus. The disk is regularly transversely oblong, the sides not convex but 

 straight, the edges in front and on the sides brown. The disk is one-half as long as 

 broad ; posterior half free from hairs, not so distinctly marked as in X. colonus, but the 

 longitudinal irregular pale streaks are present. The mesothoracic and metathoracic 

 segments are as wide as the prothoracic, but the mesothoracic is a little shorter than 

 the metathoracic. The mesothoracic segment is divided into two lateral portions by a 

 scutel-like, very short and broad callosity which is narrow, lanceolate-oval. The 

 metathoracic segment has a similar callosity, but a transverse fleshy ridge is present, 

 not found on the mesothoracic segment. Beneath is a callous brown spot incised iu 

 the middle, longer and narrower than those on the six succeeding segments. That 

 on the prothoracic is much shorter and narrower than on the mesothoracic, the latter 

 not divided mesially, where those on the metathoracic and three succeeding segments 

 are partly divided by the median line of the body, forming two irregular oval patches 

 touching the median line of the body, and with the outer, hinder edge produced a 

 little posteriorly. On the first abdominal segment is a trauisverse, short but very 

 wide crescent-shaped callosity with swollen margins; on the succeeding segments 

 these become longer and narrower, until on the fourth segment they become one-half 

 as long as broad; on the hinder segments (5 to 7) they become still longer and trans- 

 versely oblong-oval, with irregular broad thickened patches. Beneath, on the seg- 

 ments behind the fourth, the callosities disappear, but there are raised smooth oval 

 areas. A pair of thoracic feet oq each of the three segments; they are three-jointed, 

 basal joint membranous; second joint about three-fourths as long as wide; third 

 joint about two-thirds as wide as the second, and slightly longer. The ninth ab- 

 dominal segment but little narrower than the eighth ; the tenth about one-third as 

 wide as the ninth. A pair of mesothoracic spiracles and eight abdominal pairs. 



Head not quite so large in proportion as iu X. colonus. Labrum small, not quite so 

 broad as in X. colonus, convex and well rounded in front, and very hairy. Mandibles 

 black. 



Antennae four-jointed, first joint apparently divided into two subsegments; third 

 a little longer and narrower than the second; the fourth minute, obtuse, one-half as 

 long as the third is wide. Maxillae with the lobe rather small, reaching to near the 

 end of the third joint of the palpus. Maxillary palpi four-jointed, second joint 

 slightly shorter and narrower than the first; fourth half as thick as the third and 

 pointed at the tip. Labium with the mentura nearly square, narrower than the sub- 

 luentum. The ligula, which is very small in X. colonus, is here entirely wanting. 



