251 



The Odonata. By D. S. Kei.licott. 



I received for identification last fall two small collections of Dragonflies from 

 Professor Eigenmann, They have been 'studied and compared with a determined 

 collection; the following species were included: 



1. Caloperyx maculata Beauv. It occurs throughout the Eastern United 

 States and is usually abundant wherever it is found, preferring shady streams or 

 rivulets of spring water. 



2. Hebrrina americana Fabr. Several examples of both sexes. This species 

 extends over a wide eastern range and is represented in the Gulf States by a well 

 marked form known in the lists as H. husalix, and on the Pacific Slope by another, 

 H. Californica. Flies late, often until the middle of October, in Ohio. The 

 scarlet patches at the base of the wings of the male make it a beautiful and con- 

 spicuous insect. 



3. Enallagma hageni Walsh. This appears to be a rare species, but has 

 now appeared in Illinois, Indiana and Ohio. 



4. Enallagnm dgnatuvi Hagen. Extends from the Gulf to Maine. 



5. uEschna clepsydra Say. Two males and one female (?) were sent. All the 

 leschnas fly late in the season. The three species constricta, clepi^ydra and verticallis 

 resemble one another so closely that they are often regarded as one species; the 

 females can not be separated by any one as yet. 



6. Anax Junius Drury. 



7. Tramea lace rata Hagen. 



8. Libellula basalis Say. 



9. Libellula pidchella Drury. 



10. Plathcmis (rimaculafa DeGeer. 



11. Celithemis eponina Drury. 



12. Diplax vicina Hagen. This is doubtless the last odonat on the wing in 

 our latitude. In central Ohio it has been taken pairing and ovipositing as late as 

 November 8. 



13. Mesofhemis simplicollii^ Say. 



14. Pacltydiplax longipennis Burm. 



I am surprised at the absence of all Gomphines and that so few Agrionines 

 are present. Collecting in the early summer would doubtless disclose several 

 species of both groups. 



