188 ENTOMOLOGICAL NEWS. [June 



Portrait of the author. Three plates, containing 39 outline figures 

 of parts of species oi Eaallagma, Lestes, Diplax and Gomphus. 



This posthumous work of Prof. Kellicott is introduced by a pref- 

 atory note from his successor. Prof. Harbert Osborn, stating that it 

 has been prepxred from the origin il m luuscri )t left by its author. 

 Of this the first 61 piges are unc hinged. The remainder has been 

 completed, in accordance with Professor Ksllicott's plan of treat- 

 ment, by his associate, Mr. J. 8. Hine, who also contributes a bio- 

 graphical notice and a bibliography of his deceased colleague. 

 Practically, therefore, the present essay is due to Messrs. Kellicott 

 and Hine The figures have baea drawn by Mr. W. E. Kellicott. 



We have previously expressad, in this journal, our high apprecia- 

 tion of Prof. Ksllicott's work on the dragonflies of Ohio. We are, 

 therefore, much indebted to Mr. Hine fo? placing before us tlie 

 present more extended results of that study. 



The subject mitter proper begins with a brief introduction, in 

 which the student is referred to other authors for a knowledge of 

 the structure and metamorphoses of these insects. The 100 species 

 found in Ohio are then described, with frequent keys to assist in 

 their identification. Notes are frequently added upon the habits of 

 flight and of oviposition. We incline to think that the localities in 

 which the rarer species have been found have not always been suffi- 

 ciently indicated. In the hurried perusal with which we have been 

 obliged io content ourselves, it seems to us that the key to the 

 species of Lestes (p. 15) is not very helpful ; that some names, such 

 as Fonscoiombia and Diplax, have been continued which must be 

 given up; and (hat an error has been made in the key to the genera 

 of Libellulinae (p. 92) in using the character " sectors of the arculus 

 pedicillate" for Diplax[=/Syn>petrmH^ and Leacorhinia, for the 

 reason that a very considerable amount of variation exists in this 

 regard. 



Very little change has been made in arrangement and classifica- 

 tion. A considerable number of mistakes have been made by our- 

 selves and others in treating of various species of the North 

 American Odonata, and some of these errors appear in the present 

 woik. As the corrections have not yet been published, however, 

 neither Prof. Kellicott nor Mr. Hine are responsible for the errors 

 of their predecessors ; but students will do well to be on their guard 

 in identifying forms allied to Eiiallogma pollutum, Gomplms 

 lividus, fraternus and extermis. 



In closing, we call attention to a remark in the Introduction, 

 which is very cheering to the odonatologist. Trevting of the ques- 

 tion of the decrease or increase in the number of species, we read : 

 *'It is the opinion of the writer that some few forms once resident 

 are no longer within our limits, but that others have taken up their 

 homes here at the same time: in fact, it appears probable that the 

 number has increased, rather than diminished, up to the present 

 time." Philip P. Calvert. 



