THE SOUTHERN PINE SAWYER. 



47 



thorax). Larvae wliich develop into the smaller sized adults are, of 

 course, much smaller than this at maturity. The body is divided 

 into 14 well-marked segments. The first is the head. The following 

 three constitute the thorax, the first being the prothorax, the second 

 the mesothorax, and the third the metathorax. The following 9 seg- 

 ments constitute the abdomen, and are desig- 

 nated as the 1st, 2d, 3d, etc., abdominal seg- 

 ments. The last segment is called the anal 

 segment. The head (fig. 16, a) is considerably 

 longer than broad, and is capable of being 

 deeply retracted into the thorax. The pro- 

 thorax, upon the anterior part of the upper or 

 dorsal surface, is smooth and shining, but' the 

 posterior part has an opaque leathery appear- 

 ance. This opaque surface is dotted over by 

 small shining spots more or less longitudinally 

 elongate in shape. The mesothorax is smooth 



upon the upper or dorsal surface, but on the lower or ventral surface 

 is found a double transverse row of fine fleshy granviles. On the ex- 

 treme anterior portion of the side of this segment isfoimd a transverse, 

 oval, brown spot. This is the first spiracle or breathing pore. On the 



Fig. 15.— The pine sawyer. Egg, 

 greatly enlarged: a. Chorion; 

 6, amnion; c, micropyle; e, 

 same, highly magnified; d, 

 sculpture of chorion. (Orig- 

 inal.) 



Ja. S'- 



no. 16.-The pine sawyer. Larva, slightly enlarged: o, Forepartof head; 6, second 

 abdominal segment; c, abdominal spiracle, o, 6, Greatly enlarged. (Ongmal.) 



metathorax a double transverse row of granules occurs, both on the 

 doreal and on the ventral surface, but there isnospu-acleupon this 

 segment. On the fiist 7 abdominal segments there are 4 rows of 

 granules on the dorsal surface (fig. 16, 6), and 2 on the ventral. Ihe 



