THE LONG-TOED WATER BEETLES. 679 



Lake, Laporte, Lawrence and Putnam counties; frequent. July 

 21-August 20. 



1297 (3922). DRYOPS FASTIGIATUS Say, Long's Expert., II, 1X24, 275; ibid. 



I, 181. 



Similar in size and form to the preceding. Differs in having the basal 

 region of the thorax rather suddenly depressed, smooth, shining and wholly 

 without pubescence. Sides of elytra densely pubescent, but a space on each 

 side of the suture, reaching the second or third row of punctures on basal 

 half and widening to the fourth row on apical half, with only a few scat- 

 tered hairs; punctures large, coarse. Length 5-5.5 mm. 



Wells, Hancock. Vigo and Posey counties; scarce. August 10- 

 October 20. The V !<>;> County specimen was taken from beneath a 

 log in a deep ravine. 



D. striatus Lee., elongate, blackish-olivaceous, 6 mm. in length, 

 is a boreal species extending across the continent. 



Subfamily III. ELMINAE. 



Here the front coxa- are rounded without trochantin; abdomen 

 with five ventral segments, the fifth rounded at tips; antenna? sim- 

 ple, inserted upon the front near the eyes; middle coxa 1 widely sepa- 

 rated; hind coxa: separated, not dilated into a plate, protecting the 

 thighs. Four genera are known, all of which may occur in Indiana. 



KEY TO INDIANA GENERA OF ELMIN.E. 



(i. Head protected beneath by a prosternal lobe. 

 /*. Antenna? ll-jointed. 



c. Front tibia 1 pubescent on the inner side; thorax in our species with- 

 out median groove. III. ELMIS. 

 cc. Front tibia> glabrous on the inner side; thorax with a distinct me- 

 dian groove. IV. STENELMIS. 

 bit. Antenna? G-jointed. MACRONYCHUS. 

 (HI. Head free: piv'sternuni not lobed ; antenna? 11-joiuted. ANCYRONYX. 



III. ELMIS Latr. 1802. (Gr., "I drive.") 



This genus comprises about 20 small, elongate 

 or oval species (Fig. 253), of which the following 

 may occur in Indiana : 



KEY TO INDIANA SPECIES OF ELMIS. 



(i. Thorax with even surface; i. e., without elevated 

 lines or folds. 



Fig. 2">.'i Elmis bivittatux Lee. 



n. 1 borax more or less reddish-brown, slightly nar- 

 rower from base to apex. 1298. VITTATUS. 

 1>1>. Thorax black, slightly bronzed. QITADRINOTATI s. 

 (HI. Thorax with more or less uneven surface. 



