81 



Such insects as the Bean Ladybird {Epilachna corrupta), the Harle- 

 quin Cabbage-bug (Murgantia hutrionica), the Squash Bug (Aiiasa tris- 

 tis)j and the cabbage-worms (larvae of Pieris and Plusia), would doubt- 

 less be much affected by submersion of the plants for a considerable 

 time. 



Finally, as remarked by the author in Psyche (vol. vi, p. lOG), our 

 system of irrigation from the Kio Grande River must greatly aid in 

 the dispersion through this valley of our native species of Simulium 

 {^. oecidentale). These gnats are a great plague to mankind in this 

 region through the spring months, and this is one of the few adverse 

 bearings of the question of irrigation, as i)racticed here at the present 

 time, on injurious insects. 



On the whole, we may safely conclude that, as an adjunct to the 

 proper use of the arsenites and kerosene, irrigation can be made to 

 exert a valuable influence ux3on the i^roblem of insect injury in New 

 Mexico, and elsewhere as well. Many of the insects for which irriga- 

 tion would prove a sovereign remedy have not yet reached us here, 

 especially in the southern portion of the Territory. Such are the Chinch 

 Bug, Phylloxera, and Rocky Mountain Locust. When these insects 

 arrive the general usefulness of irrigation in controlling insect injury 

 will, as a matter of course, be considerably extended in this region. 



Mr. Smith questioned somewhat the effect of irrigation on the eggs 

 of locusts. In the cranberry marshes submerging did not in all cases 

 destroy the vitality of eggs of some species, and he thought this might 

 prove true with other species in New Mexico. 



Mr. Lintner thought that not only the effect of water, but of some 

 insecticides as well, on the eggs of insects was a subject about which 

 we needed much better information than we at present possessed. 



Mr. Smith said that kerosene emulsion of ordinary strength would 

 not destroy the eggs of the Squash Bug or of the Elm Leaf-beetle, and 

 eggs of museum pests had been unaffected by an aj)plication of carbon 

 bisulphide to the boxes of insects where they occurred. 



Mr. Forbes thought, as the protoplasm in the egg was the part which 

 we desired to destroy, we should experiment with such substances or 

 insecticides as would be most likely to destroy protoplasm. 



Mr. Smith suggested that, after all, the main effect of kerosene 

 emulsion on insects might be through the respiratory system. 



The following paper was then read : 



NOTES ON ^GERIID^ OF CENTRAL OHIO— IL 



By D. S. Kellicott, Columbus, Ohio. 



The first collection of notes on the ^geriidae of central Ohio was 

 published in the current volume of the Canadian Entomologist. Since 

 the former notes left my hands additional observations have been made 

 and a few more species collected. Inasmuch as I shall have some- 



