THE GENUS PISSODES. 43 



CHARACTERS COMMON TO THE SPECIES OF THE GENUS. 



Adults. ^Frothorax with anterior ventral margin not distinctly 

 emarginate; tibiae with incurved apical tooth; femora unarmed; 

 anterior coxse not widely separated; abdominal tergites covered by 

 elytra; sternites 3 and 4 (first and second visible) very long; 5 and 6 

 short; 7 as long as 5 and 6 together; eyes rounded, widely separated; 

 body oblong, reddish brown to black, sparsely to thickly clothed with 

 slender to broad scales, the latter often forming spots on the prono- 

 tum, elytra, and femora. 



Sexes. — Females with but 7 visible abdominal tergites; beak longer, 

 smoother, and more slender than in the males. Males with 8 visible 

 abdominal tergites; beak shorter, stouter, less shining, and more 

 distinctly punctured. 



Eggs. — Pearly white, slightly oblong, and equally rounded at both 

 ends. 



Larvse. — Elongate, cylindrical, yellowish white, footless; body with 

 12 closely wrinkled segments, those of the thorax not larger or more 

 permanent than the first abdominal. 



Pupse. — Of the general size and form of the adults, with the beak 

 folded on the mesosterna and metasterna; tips of the posterior tarsi 

 even with tips of wing-pads; head, beak, and abdominal segments 

 armed with spines, the ninth abdominal having 2 rather prominent 

 epipleural spines. 



Larval galleries. — Excavated in the inner bark and sometimes 

 marking or grooving the surface of the wood; elongate, winding, and 

 either in the bark or outer wood, ending in pupal cells which are lined 

 with excelsior-like borings. 



Host trees. — Pinus, Picea, Ahies, Cedrus, and Pseudotsuga. 



Distribution. — Spain and England into eastern Siberia and Japan; 

 America north of Mexico. 



CHARACTERS COMMON TO THE SPECIES OF THE MAJOR AND 

 MINOR DIVISIONS. 



DIVISION I. 



(Species Nos. 1 to 28.) 



Adults. — Elytral interspaces 3 and 5 broader and more elevated 

 than 2 and 4. 



Sexes. — Hind tibiae of the males without long fringe of hairs. 



Pupse and larvse. — Apparently without distinctive divisional char- 

 acters, so far as observed. 



