ILLUSTRATIONS. 



PLATES. 



Page 

 Plate I. Classification of the genus Pissodes, showing technical and common 



names and species numbers 1 



II. Statistical taxonomy of Pissodes 30 



III. Adults of Pissodes. Fig. 1.— P. similis. Fig. 6.— P. strobi. Fig. 



8.— P. schwarzi. Fig. 15.— P. radiatse. Fig. 16.—P.fasciatus. 



Fig. 18.— P. Jiskei 68 



IV. Adults of Pissodes. Fig. 20.— P. puncticollis. Fig. 24.— P. rotunda- 



tus. Fig. 25.— P. burkei. Fig. 26.— P. piperi. Fig. 27.— P. 



dubius. — Fig. 29. — P. affinis 68 



V. Larva and pupa of Pissodes. Fig. A.~P. piperi, larva— dorsal, lat- 

 eral, and ventral aspects. Fig. B.—P. sitchensis, pupa— dorsal, 



ventral, and lateral aspects 68 



VI. Pygal tergites of the abdomen of Pissodes. Fig. 5, 9 .— Tergite 7 of 

 P. engelmanni. Fig. 5, c? .—Tergites 7 and 8 of P. engelmanni. 

 Fig. 6.— Tergites 7 and 8 of P. strobi. Fig. 7, c? .—Tergites 7 and 8 

 of P. approximatus. Fig. 28, c? .—Tergites 7 and 8 of P. fraseri; 

 Fig. 28, 9.— Tergite 7 of P. /rasen. Fig. 29, (?.— Tergites 7 and 8 of 



P. «^nis. Fig. 30, c? .—Tergites 7 and 8 of P. cumei 68 



VII. Female reproductive organs of Pissodes 68 



VIII. Male and female reproductive organs of Pissodes 68 



IX. Male reproductive organs of Pissodes 68 



X. Forks of male genitalia of Pissodes 68 



XI. Stems of male genitalia of Pissodes 68 



XII. Pissodes Jiskei: Work in inner bark and outer wood 68 



XIII. Pissodes sitchensis: Work in terminal and top 68 



XIV. Pissodes strobi: Work in terminals and tops 68 



XV. Work of Pissodes approximatus and P. nemorensis in bark and wood 



of small sapling 68 



XVI. Work of Pissodes yosemite and P. schwarzi in bark and wood 68 



XVII. Pissodes fasciatus: Work in bark and outer wood 68 



XVIII. Pissodes piperi: Work in bark 68 



XIX. Distribution maps of Pissodes. Fig. 1.— P. similis. Fig. 2.— P. 



utahensis. Fig. 3.— P. barberi. Fig. 4.— P. sitchensis. Fig. 5.— 



P. engelmanni. Fig. 6.— P. strobi. Fig. 7.— P. approximatus. 



Fig. 8. — P. schwarzi 68 



XX. Distribution maps of Pissodes. Fig. 9.— P. canadensis. Fig. 10. — 



P. nemorensis. Fig. 11.— P. deodarse. Fig. 12.— P. calif ornicus . 



Fig. 13.— P. yosemite. Fig. 14.— P. ivebbi. Fig. 15.— P. radiatse. 



Fig. 16. — P. fasciatus 68 



XXI. Distribution maps of Pissodes. Fig. 17.— P. costatus. Fig. 18.— P. 



Jiskei. Fig. 19.— P. nigrse. Fig. 20.— P. puncticollis. Fig. 21.— 



P. murrayanse. Fig. 22. — P. coloradensis . Fig. 23.— P. alascensis. 



Fig. 24. — P. rotundatus 68 



IX 



