April, 'o6] ENTOMOLOGICAL NEWS. 133 



worms, and earthworms were placed in the room in glasses 

 covered with open netting ; one earthworm was buried in soil. 

 All of the Arthropods survived without any injury the effects 

 of the fumes in which a man would probably die in a short 

 time, and in which dogs and birds perish. Two earthworms 

 exposed to the fumes without soil had dried out and were 

 dead, while the one in the soil remained fresh and lively. 

 "This astonishing resistance to the fumes," says Lampert, 

 "could possibly be explained by the tracheal respiration as 

 the animals close the breathing-holes and the air collected in 

 the trachese would be sufficient for the little breathing neces- 

 sary. That the chitinous armor is of little importance in 

 resisting the fumes, is proven by the ability to resist of the 

 thin-skinned saw-fly larvae.'' 



I have found in a hasty review of the literature no other 

 records of experiments with formaldehyde as an insecticide. 

 The evidence submitted seems to be overwhelming that for- 

 maldehyde has little or no insecticidal qualities, when used in 

 practicable quantities, and especially against household insects. 



Dragonflies (Odonata) Collected by Dr. D. A* Atkin- 

 son in Newfoundland, with Notes on some 

 Species of Somatochlora. 

 By E. B. Williamson. 



(Plates V and VI.) 



The only list of Newfoundland dragonflies known to me is 

 the paper in Ent. Month. Mag. XI, pp. 241-243, April, 1875, 

 by De Selys, based on collections made by John Milne. De 

 Selys records the following species : Leucorhinia hudso?iica, 

 Selys 1 $ , Cordidia shurtleffi Scudder, 1 9 , Epitheca cingulata 

 Selys, 2 $ and 3 9 , Epitheca forcipata Scudder, 1 9 , Aeschna 

 hudsonica n. sp. 1 $ and 4 9 (also from Canada), Aeschna 

 clepsydra Say (?) 2 9 , Gomphus (?) sp. 1 $ , and Aenallagma 

 boreale n. sp. 1 $ and 1 9 . 



In Ent. News, May, 1902, pp. 144-146, I recorded the species 

 taken by Dr. Atkinson at the Magdalen Islands. This list 

 was remarkable for its cosmopolitan character. Only 6 species 



