18 STATEN ISLAND INSTITUTE OF ARTS AND SCIENCES 
2686. Gyrinus fraternus Coup. April, May. Described from 
: Canada; ranges fide Fall south to. Riverhead, L. I. 
(Davis). 
2688. Gyrinus limbatus Say. October 9, 1915 (Woodruff). 
2690. Gyrinus elevatus Lec. March. 
2691. Gyrinus ventralis Kirby. March, May, August. 
2692, Gyrus agumns Wee, Staten Vsland) Davis. = El Ge Halll 
in The North Am. Species of Gyrinus. 
—— Gyrinus woodruffi Fall. Type locality, Willow Brook. 
2696. Gyrinus affinis Aube. Clove Valley, June; also reported 
by Linell. 
2700. Gyrinus analis Say. May, August. 
2707. Gyrinus borealis Aube. May, June, August. 
2707a. Gyrinus lugens Lec. May, October. 
UAIMUNL SC Jel IDIROIP ISUULIUDYAs, 
2718. Ochthebwuus tuberculatus Lec. July, Bull’s Head (C. W. 
, Lame, |r.) 
2729. Hydrena pennsylvanica Kies. On stick in brook. 
2739. Helophorus tuberculatus Gyll. South Shore, July 19, 1915. 
2744. Helophorus obscurus Lec. June. This species replaces H. 
lacustris of the New Jersey list according to Mr. Win- 
ters? (obscurus was described from Calif.). 
2750. Helophorus lineatus Say. Jan., May, June, July. Bull’s 
Head; Clove Valley; also reported by Linell. 
2754. Hydrochus scabratus Muls. May, August. 
2758. Hydrochus inequalis Lec.? April, May. Reported by 
Linell, September 20, 1916, Bull’s Head (Woodruff). 
2761. Hydrochus subcupreus Rand. April. 
2774. Berosus aculeatus Lec. Bull’s Head pond, June 30, 1893. 
27/7. Berosus peregrinus HUbst. April, May. 
2784. Berosus striatus Say. April, May, June, July, Aug. 
2789. Hydrous triangularis Say. May, Aug., Sept., Oct. A 
specimen in confinement hatched from pupa about Au- 
gust 1, 1888. Found at New Brighton under wet leaves, 
October 30, 1902. Often found about electric lights. 
