OF WASHINGTON, VOLUME XIII, 11)11. 139 



However, this does not hold good in our species of the family 

 Belostomidae, where the eggs show a distinct cap, which is 

 somewhat obliquely placed at the upper egg-pole and pushed 

 off at hatching, as stated by Needham in his description of the 

 eggs of Benacus. Bueuo also observed in his careful study 

 of the life history of Belostoma fuminta, how the nymph 

 conies out through a round lid that splits off the top of the 

 egg and is attached thereto by a hinge extending about one- 

 quarter the circumference. 



In recent years some American authors, foremost among 

 these J. R. de la Torre Bu'eno, a keen observer, interested them- 

 selves in the study of the formerly much neglected aquatics 

 and semi-aquatics. Excellent accounts of the life-history and 

 accurate descriptions of the eggs of water- bugs have been 

 published; thus the writer will refrain from repeating the 

 same and refers to the original descriptions, viz: 



Family Hydrometridae: The egg is described and figured 

 by J. O. Martin in his "Study of Hydrometra I in eata" mar- 

 tini (Can. Ent., 1900, p. 75). In' addition Bueno has given 

 his observations in "Notes on Hvdrometra martini" (Can. 

 Ent., 1905, p. 13). 



Family Gerridae, subf. Veliaini: Description and figure of 

 eggs of Microvelia americana. Life Histories of North 

 American water-bugs, by Bueuo (Can. Ent., 1910, p. 182). 



Family Naucoridae: Egg described and figured by Bueno 

 in his publication "Brief notes toward the life history of 

 Pelocoris femorata, with a few remarks on habits" (Journal 

 N. Y. Ent. Soc., vol. xi, 3, 1903). 



Family Belostomidae: The egg of Belostoma fluminca, de- 

 scribed in "Life-histories of North American water-bugs," by 

 Bueno (Can. Ent., 1906, p. 193). 



Pedinocoris macrony.v: "A ferocious water-bug." Eggs 

 described by G. W. Harvey. (Can. Ent., 1907, p. 19.) 



"The eggs of Benacus and their hatching," by James G. 

 Needham (Ent. News, 1907, vol. xvm, No. 4, p. 114). 



Eggs of Lethocerus (Belostoma') grand is: "Belostomidae 

 and some other fish-destroying bugs," by George Dimmock. 

 (Ann. Rep. Fish and Game Commissioners, 1886). 



Family Nepidae: "Theeggof the water scorpion" (Kanatni 

 fusca'), by R H. Pettit (Can. Ent., 1902, p. 213). An ad- 

 ditional description of the egg of Ranatra quadridentata, by 

 Bueno, in his Life histories of North American water-bugs. 

 (Can. Ent., 1906, p. 247.) 



Family Notonectidae: "The genus Xotonccta in America 

 north of Mexico," by Bueno. Egg described of the species 



