NO. 2134. NORTH AMERICAN COLLEMBOLOVS INSECTS—FOLSOM. 515 



Podura granulata MacGillivra}^ ('935, p. 316) is a sjoionym of 

 P. aquatica Linnaeus, as I have found by an examination of two of 

 the cotypes. 



Podura aquatica, one of our most abundant collembolans, occurs 

 on the surface of standing water on the margins of ponds and streams, 

 having special structural adaptations for a semi-aquatic hfe. It 

 swarms on vegetation or rubbish along the shore, and at times is 

 blowai against the shore in masses of enormous numbers. This 

 species often appears in fresh-water aquaria, and is essentially a 

 fresh-water species, though it has been found occasionally in pools 

 of bracldsh water on the seashore. 



P. aquatica is common throughout Europe and has been taken in 

 Siberia. 



Massachusetts.— Cambridge, March 13, April 17, 22, 29, May 14. 

 Belmont, March 27, April 19, 23. Arhngton, March 13, 27, April 

 17, May 10. Lexington, May 10. Waltham, May 9. Weston, 

 July 16. Dedham, July 12. Norwood, August 26. 



Ohio. — YeUow Springs, February 9, April 3, August 18. 



Lidiana. — Bluffton, C. C. Deam. 



Illinois. — Urbana, May 5, July IS, October 9. Galesburg, March, 

 J. G. Needham. 



Tennessee. — H. E. Summers. 



Wisconsin. — ^Two Rivei's, September 1. 



Mmnesota. — J. E. Guthrie (Univ. Minn.). 



Washington. — L. M. Bremner (Stanford Univ.). 



REFERENCES. 



Absolon, K. 1900a. Studie o jeskynnich siipinnskdch. Vestuik Khibii pnroclov. 



Prostejove, vol. 3, pp. 1-39. 

 ■ — 19006. Vorlaiifige Mittheilung iiber die Aphoruriden aiis den Hohlen des 



mahrischen Karstes. Zool. Anz., vol. 23, pp. 406-414. 

 — — — 1901a. Ueber einige theils neue CoUembolen aus den Hohlen Frankreicha 



und des siidlichen Karstes. Zool. Anz., vol. 24, pp. 82-90. 



19016. Ueber Neanura tenebrarum n. sp. aus den Hohlen des mahrischen 



Karstes; uber die Gattiing Tetrodontophora Renter und einige Sinnesorgane der 



CoUembolen. Zool. Anz., vol. 24, pp. 575-586. 

 Agren, H. 1903. Zur Kenntnissder Apterygoten-Fauna Siid-Schwedens. Stettin. 



ent. Zeitschr., vol. 64, pp. 113-176. 

 - ■ ■ 1904. Lapplandische Collembola. Arkiv Zool. K. Svenska Vetensk., vol. 



2, pp. 1-30. 

 AxELSON, W. M. 1900. Vorliuifige Mittheilung iiber einige neue Collembolen- 



Formen aus Finnland. Medd. Soc. Fauna Flora Fennica, vol. 26, pp. 105-123. 

 ■ 1902. Diagnosen neuer CoUembolen aus Finnland und angrenzenden Teilen 



des nordwestlichen Russlands. Medd. Soc. Fauna Flora Fennica, vol. 28, pp. 



101-111. 

 — — 1903a. Weitere Diagnosen iiber neue Collembolen-Formen aus Finnland. 



Acta Soc. Fauna Flora Fennica, vol. 25, pp. 1-13. 

 19036. Beitrage zur Kenntniss der Collembolen-Fauna Sibiriens. Of v. 



Finska Vet.-Soc. Forh., vol. 45, pp. 1- 



X-3. 



