22fi 



FAMILY IV. — DYTTSOTT)^. 



A. erytJiropterus Say, A. reticulatus Aube and A. obtusatus 

 Say are members of the boreal fauna known from Massachusetts to 

 Lake Superior and perhaps occur in northern Indiana. 



436 (1433). Agabus antheacinds Mann, Bull. Mosc, II, 1852, 304. 

 Oval, moderately convex. Black, subopaque ; antennae, palpi and legs 



reddish-brown. Upper surface everywhere finely and densely reticulate. 

 Elytra with a few fine scattered punctures toward apex. Prosternum dis- 

 tinctly widened behind the front coxse, subcarinate its full length. Front 

 and middle tarsi of male with distinct but small disks. Length 6-7.5 mm. 



Kosciusko County; rare. June 1. Taken from border of 

 sphagnum marsh. A boreal species ranging to Hudson's Bay and 

 Alaska. 



437 (9300). Agabus confinis Gyll., Ins. Suec, I, 1S27, 511. 

 Oblong-oval, convex. Head, thorax and under surface black; elytra 



dark brown, polished; antennae, front legs and margins of elytra reddish- 

 brown; hind femora piceous. Elytra sparingly and irregularly punctate. 

 Length 8.5-9.5 mm. 



Lake and Laporte counties ; frequent beneath rubbish along the 

 shores of Lake Michigan. May 5-November 9. 



438 (1411). Agabus seeiatus Say, Trans. Anier. Phil. Soc, II, 1823, 97; 



ibid. II, 511. 



Oblong-ovate, subconvex. Black, slightly bronzed, shining; antenme 

 and legs dark reddish-brown. Elytra very finely and closely reticulate, 

 with two or three dorsal rows of punctures evident but indistinct. Length 

 9-10 mm. 



Vigo and Posey counties; scarce. April 24-October 20. In 

 Vigo County taken from beneath stone in bottom of deep ravine. 



439 (1421). Agabus punctatus Melsh., Proe. Phil. Acad. Nat. Sci., II. 



1844, 27. 



Short, ovate, convex. Head, antennae and legs reddish-brown; thorax 

 and elytra darker brown; under surface piceous. Thorax with sides nearly 

 straight, the margin distinct. Elytra with irregular dorsal rows of punc- 

 tures and numerous additional scattered ones on apical half. Outer spur 

 of hind tibiae broad and large. Length 7.5-8.5 mm. 



Lake and Marion counties. March 14~June 4. Common in 

 woodland pond near Broad Eipple in early spring. 



440 (1417). Agabus stagninus Say, Trans. Amer. Phil. Soc, II, 1823, 100; 



ibid. II, 513. 



Broadly ovate, subdepressed. Black or piceous, slightly bronzed above, 

 shining; under parts reddish-brown; vertex with two small reddish spots. 

 Sides of thorax but little rounded, strongly margined. Elytra very finely 

 reticulate, with an indistinct submarginal yellowish stripe on apical half 

 and three rows of rather large punctures. Length 10 mm. 



