40 ENTOMOLOGICAL NEWS [Feb., '22 



SCHMIDT, 1915. Vergleichende Morphologic des 2 und 3. Abdominal 



segment bei mannlichen Libellen. Zool. Jahrb., Abteil. Anat. Ontog., 



XXXIX, pp. 87-200. 

 BARTENEF, 1915. Libellulidae. Insectes Neuropteres in Fauna de la 



Russe., pp. 1-352. 

 WILLIAMSON, 1920. A new Gomphine genus from British Guiana with 



a note on the classification of the subfamily. Occ. Papers, No. 80. 



Mus. Zool. Univ. Mich. 



EXPLANATION OF PLATES II AND III. 



PLATE II. 



Figs. 1-2. Sympctrum scmicinctum (Say). Sunnyside, Washington. Lat- 

 eral and ventral views of the apical segment of the penis. 



Fig. 3. Libcllula saturata Uhler. Phoenix, Arizona. Penis, ventral 

 view. 

 The following, except fig. 11, are lateral views of the penis. 



Fig. 4. Libcllula composita (Hagen). Laws, California. 



Fig. 5. Libellula scmifasciata Burm. Pungo Lake, North Carolina. 



Fig. 6. Libcllula nodisticta Hagen. Laws, Owens Valley, California. 



Fig. 7. Libellula angclina Selys. Kioto, Japan. Coll. of Ris. 



Fig. 8. Libcllula 4-maculata Linn. Grodno Government, Poland. From 

 Bartenef. 



Fig. 9. Libcllula fulva Muell. Aries? From Morton. 



Fig. 10. Libcllula inccsta Hagen. (No locality). From O. S. U. coll. 



Fig. 11. Libcllula subornata (Hagen). Golconda, Nevada. Apex of 

 penis viewed from the inner dorsal side with the lateral lobes spread. 

 Enlarged. See Plate III, fig. 16 of lydia. 



Fig. 12. Libcllula dcprcssa Linn. Lublin Government, Poland. From 

 Bartenef. 



Fig. 13. Orthcinis ferruginea (Fabr.). Atoyac, Vera Cruz, Mexico. 

 Coll. O. S. U. 



Fig. 14. Orthctrum cacnilesccns (Fabr.). North Wales. From Mor- 

 ton. 



Fig. 15. Thcnnorthcmis madagascarensis (Ramb.). Madagascar. Coll. 

 O. S. U. 



PLATE III. 



Figs. 16-25. Libcllula lydia (Drury). Columbus, Ohio. 



Fig. 16. Ventral and lateral view of adult penis. 



Fig. 17. Lateral view of penis of the last naiadal instar drawn in 

 shadow. 



Figs. 18-25. Cross-sections at the levels indicated in fig. 17 by the let- 

 tered lines. 



Figs. 26-27. Libcllula jcsscana Willsm. Enterprise, Florida. From coll. 

 Williamson. Fig. 26 is erected by boiling. 



Figs. 28-29. Libcllula incesta Hagen. Kingsboro, North Carolina. Cross- 

 section of penis showing the erectile hairs. 



