260 MICHIGAN SURVEY, 1908. 



Undejrsvood, L. M. 

 1887. The Progress of Arachnology in America. Amer. Nat. 21, pp. 

 963-975. 



IXSEC'J'A. 



Entonwhryidae. 



Tomocerus niger Beurl. Specimens of this spring-tail (G. 140) were 

 taken July 24, in the balsam-spruce forest (I, 3). 



This species has an extensive range; through Europe, Siberia, Alaska, 

 California, Minnesota, Isle Eoyale, Michigan, cf. Polsom, 1902, Proc. 

 Wash. Acad. Sciences, IV, p. 07; Guthrie, 1903, The Gollembola of 

 Minnesota, p. 81. 



HEJIIPTERA. 



Gorisidae. 



Corixa sp. Nymphs were taken in the rock pools on the beach (I, 1) 

 (G. 73, 74, 75) ; in Summer Lake (III, 5). (G. 175) ; and in the pond 

 in a tamarack-spruce swamps (V, 11) (126. A). 



Belostomatidae. 



Belostoma sp. Nymphs, but no adults, were secured at Sumner Lake 

 (III, 5) (77 A.) ; and in the pond in the tamarack-spruce swamp (V, 



11) (126 A) on August 16. 



* 



Saldidae. 



Salda Ugata Say. On August 10 these shore bugs were running about 

 in numbers on the bare rock beach, just beyond the reach of the waves, 

 on the south shore near the mouth of Siskowit Bay (V, 2) (106 A). 

 •'Common over eastern United States. These specimens are darker 

 than most in my collection but seem to agree very perfectly with de- 

 scriptions of Say and Uhler." H. Osborn. 



HydroMtidae. 



Gerris remigis Saj. This member of the surface film fauna was found 

 on July 14 on the bulrush zone and delta, near the head of Rock Harbor 

 (III, 3) ; in rock pools at Scovill Point on July 19 (33 A), where 

 it was very abundant and represented by unwinged adults and nymphs; 

 in "rock pools on the south shore near Siskowit Bay (V, 2) on August 

 9 and 14 by adults and nymphs (103 A, 117 A) ; and on Lake Desor (VII. 

 '04) on August 20 (139 A) by both young and adults. 



Gerris rufoscutellatus Latr. This species of water strider, in com- 

 pany with G. remigis, was taken from rock pools at Scoyill Point (IV, 

 J) on July 19 (33 A). The specimens are winged. Also from the rock 

 beach pools on the south shore (V, 2) on August 14 (117, A), and from 

 a pond surrounded bt a tamarack-spruce bog (V. 11) on August 16 

 (126 A). 



Gerris inarginafus Say.. This third species of strider was found only 

 at Sumner Lake (III, 5) on July 28 (G. 175), and was represented by 

 nymj)hs and adults. 



