268 ENTOMOLOGICAL NEWS. [June, 'l/ 



and hatching, the behavior of the young nymph and the dura- 

 tion of the first nymphal instar. She did not carry them 

 farther because of the difficulties involved. 



In the literature dealing with the species in other lands, Kir- 

 kaldy (1897) in a footnote to his "Revision of the Notonecti- 

 dae," stated his success in rearing to the third instar and re- 

 gretted his inability to record the complete cycle, though he 

 correctly surmised that there are five nymphal instars. 



Delcourt (1907) gives brief reference to the number of in- 

 stars and states that he reared N. glauca on mosquito wrigglers. 

 This author was chiefly concerned with taxonomic problems 

 as is shown by the title of his paper, "De la Necessite d'une 

 Revision des Notonectes de France." 



In 1911 D. Nowrojee gave the most complete account of thr. 

 life history of any member of the subfamily Notonectinae. 

 His paper deals with Enithares indie a Fab. and is a two page 

 account accompanied by four figures (egg, nymph, and adult) 

 in color. A description of the egg, the length of incubation 

 and the duration of the various instars are given. 



Hoppe (1912) in his paper on "Die Atmung von Notonecta 

 glauca" makes a few remarks on the life history, noting five 

 nymphal instars. 



On the other hand the behavior of these insects has been 

 the subject of careful study on the part of a number of work- 

 ers especially in relation to respiration. 



Brocher (1909, 1913) and Hoppe in Europe have made ex- 

 tended studies on the respiration of Notonecta glanca and 

 Christine Essenberg (1915), of Berkeley, California, has writ- 

 ten upon the behavior of four California species. 



In addition to the above more important references, dealing 

 with species of Notonecta, there are many interesting notes to 

 be found in the text-books and scattered through the literature 

 from an early date to the present time. Some of these will be 

 noted in the body of this paper or listed in the Bibliography. 



HABITAT AND MIGRATION. 



Notonecta undidata, besides being the most widely distri- 

 buted form, seems to be able to adapt itself to a wider range 



