BULLETIN or THE UNITED STATES FISH COMMISSION. 359 



this habit of the bugs, and by waiting' bcucath the electric lights have eu- 

 riclied their collectious by capturing the fallen insects. The more brill- 

 iant the light the more insects are attracted to it, and on this account 

 tlie electric light lias proved mucli more favorable for collectors than 

 gas-lights were. If tlie number of bugs attracted to the electric light 

 were found to be suliicient to make that a valuable means for destroy- 

 ing them, it would be easy to contrive a trap that would retain the in- 

 sects after they bad fallen beneath the light. Traps constructed on a 

 similar principle have been used by insect collectors for a long time. 



It is quite i)ossible tliat an illuminated trap beneatli the surface of 

 the water would attract many more of the Belostoviidw than does a light 

 above the surface, for these insects do not often leave the water, appar- 

 ently, except when they quit it for the purpose of migration. 



In conclusion, it may be said that any practical modes of combating 

 such insect pests as Bclostoma are as yet undiscovered. 



LITERATUKE. 



' do Geer, C. M6m. pour sorvir :\ I'liist. des iuH., 1771, v. 1. 



- D [ale, J. C] Brief not ices of tlic habits aud trausfoniiatious of tlie dragon-fly; 



* * * (Mag. nat. hist., 1832, s. 1, v. 5, p. 517-520, fig. 98.) 



■^ vou Muetzsciiefahl. Nacliriclit vou eiuigcu wasser-insccteu au der bartsch, 

 nacli welcliensich die fiscber bey ihren wiutcriiscbereyeu ricbteu. (Oekou. iiacbr. d. 

 Gesells. in Scblesien, 1778, v. 6, p. 393-394; 1779, v. 7, p. 2-5.) 



■•Elles, J. Tbe water beetle. (Mag. nat. bist., 1830, s. 1, v. 3, p. 148-149.) 



•'^ Dale, J. C. Small fisbes are destroyed by otber insects, besides the larvai of the 

 dragou-llies. (Mag. nat. hist., 1832, s. 1, v. 5, p. 008.) 



'• Riley, C. V. Water-beetles destroying carp. (Bull. U. S. Fish Comui., 1885, v. 5, 

 p. 311.) 



' LeiuY; .J. Hist, and anatomy of tbe homii)torous genus Bdosloma. ( Journ. Acad, 

 nat. sci., Phil., 1847, v. 1, p. .57-07, pi. 10.) 



^Glover, T. L'eport of tbe entomologist. Ileteroptera, or plant-bugs. (Kept. U. 

 S. Comm. Agric, 187.5, p. 114-130, 03 fig.) 



'' MiLNEit, ,J. W. Invertebrates ■\vbich prey upon lislies, reptiles, and amidiibia. 

 (Field and forest, July, 1870, v. 2, p. 4-0.) 



'"Ormerod, Mfss E. A. Ranalra Hnearin. (Entomologist, 1878, v. 11, p. 119-120.) 



1' [Peck.] Eanatra linearis attacking carp eggs. (Entomologist, 1878, v. 11, p. 

 95.)' 



'2 Turner, H. W. The Beloaloma luscivorous. (Amer. nat., 1S79, v. 13, p. 585.) 



'^Turner, H. W. llelostuma piscivorous. (Amer. nat., 1879, v. 13, ji. 710-711.) 



" Leonard, J. A. Report on the Edinburgh fisheries exhibition. (Bull. U. S. Fisb 

 Comm., 1882, v. 2, p. 80-82.) 



'5 Todd, J. E. A small Bdosloma captures a fish. (Amor, nat., 1883, v. 17, p, 548- 

 549.) 



"i UULER, P. R. Plemiptera. (Standard nat. hist., 1884, v. 2, p. 204-293, fig. 28(}- 

 340.) 



Cambridge, Mass., December 20, 188G. 



