THE LONG-TOED WATER BEETLES. 679 



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

 21-August 20. 



1297 (3922). Deyops fastigiatus Say, Long's Exped., II, 1S24, 275; ibid. 

 I, 181. 

 Similar in size and form to the preceding. Differs in liaving tlie 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. 



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

 Oetober 20. The Vigo 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 eoxtc are rounded without trochantin ; abdomen 

 with five ventral segments, the fifth rounded at tips; antennse sim-' 

 pie, inserted upon the front near the eyes ; middle coxob widely sepa- 

 rated; hind coxae 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 ELMINyE. 



a. Head protected beneath by a prosternal lobe. 

 h. Antennas ll-.iointed. 



c. Front tibire pubescent fm the inner side ; thorax in our species with- 

 out median groove. III. Elmis. 

 CO. Front tibite glabrous on the inner side; thorax with a distinct me- 

 dian groove. IV. Stenelmis. 

 bb. Antennie 6-jointed. Mackonychus. 

 aa. Head free; presternum not lobed; autennfe 11-jointed. Ancyeonyx. 



IIL ELMisLatr. 1802. ((4r., "I drive.") 



This genus comprises about 20 small, elongate 

 or oval species (Fig. 2o?>) . of which the following 

 may occur in Indiana : 



key to INDIAN.^ SPECIES OF ELMIS. 



(/. Thorax with even svu'face; i. e., without elevated 

 lines or folds. 

 b. Thorax more or less reddisli-brown, sliglitly nar- 

 rower from base to apex. 1298. vittatus. 

 bb. Thorax black, slightly bronzed. quadrinotatos. 

 aa. Thorax with more or less uneven surface. 



Fig. 2.53. Elmis bivittalm Lee. 



