THE PAINTED HICKORY BORER 187 



white or pale yellow, and the pronotum of the male marked anteriorly 

 with a median sub-rotundate area, which is joined, by means of a trans- 

 verse punctate band, with each of the punctate areas. 



The egg 



The egg is elongate-oval in shape, milky white in color, and measures 

 2 millimeters in length by .85 millimeters at its broadest point. The 

 chorion is very delicate and smooth, lacking ridges or other characteristic 

 markings. There is a considerable difference in the curvatures of the 

 dorsal and ventral surfaces, the ventral surface being noticeably more 

 convex. However, the shape may vary considerably, since the chorion 

 permits them to be easily modified to fit the crevices in which they are 

 deposited. 



The larva 



Packard (r88i) described the larva as follows: 



Body thick; mouth-parts black; head reddish behind the antennae. Prothoracic 

 segment (first behind the head) large and broad, being one-half as long as broad; flat 

 and broad above, the upper surface being lower than that of the succeeding segment; 

 the anterior edge thickened, being slightly corneous; a mesial deeply impressed line, 

 especially on the hinder two-thirds, where it becomes a broad, deep angular furrow, 

 dividing the tergum into two quadrant-shaped halves; the outer edge of the segment 

 rises above the flattened tergal portion, which is sparsely covered with hairs; the latter 

 thicker along the sides of the body. The body contracts in width behind the 4th 

 abdominal segment; the upper side of each of the first six abdominal segments (corre- 

 sponding to those segments in the beetle) is raised into blister-like swellings, especially 

 on the 5th and 6th segments, which are much narrower than the four preceding segments. 

 These dorsal swellings are smooth and free from fine hairs. Abdominal segments 7-9 

 convex above, not swollen, and the abdomen is narrowest between the 5th and 6th 

 segments. A pair of large spiracles on the mesothoracic segment, and a pair on each 

 of the first eight abdominal segments. 



Antennae 3- jointed; the two basal joints being of the same length; the basal one 

 being one- third stouter than the 2nd; the third joint filiform, and one-half as long as 

 the 2nd joint, and ending in two or three hairs. The thin membranous labrum is 

 divided into two parts, the basal solid, the terminal portion forming a moveable flap, 

 overlapping and reaching nearly to the end of the mandibles when closed; the basal 

 portion is shorter than broad, being broadly trapezoidal and smooth; the outer division 

 is broader than long, the edges being rounded, so that it is almost broadly ovate (trans- 

 versely) and smooth, covered with long hairs. It is pale membranous, of a testaceous 

 hue. Mandibles black, very thick and stout, with obtuse, rounded edges; they are 

 almost as long as the base is broad. Maxillae membranous, flattened; maxillary palpi 

 2-jointed. Labium membranous, with a transverse chitinous band near the insertion 

 of the 2-jointed palpi; both joints short; second one-half as thick as the first; edge hairy, 

 the hairs reaching to the ends of the palpi. Length of body 0.50 inch; breadth of 

 prothoracic segment, 4.2 mm.; breadth of head, 3.2 mm. 



There is considerable variation in the length of the full-grown larva, 

 the range being from J to if inches. The larva also shortens con- 

 siderably just before changing to the pupa. In all the larvae examined 

 by the writer, the maxillary palpi were three- join ted, instead of two- 

 jointed as described by Packard (1881). 



