234 



FAMILY IV. — DYTlSCIML 



A. medial us Say has the same range as the other two species, 

 and should therefore occur in the State. 



457 (1493). Acinus fbateknus Harr., New Eng. Far., 1S29, S. 



Close to semisulcatus. but a little larger, darker and more densely 

 punctured. Black lines of thorax broader ; femora nearly black. Length 

 13-14.5 mm. 



Marion. Putnam and Vigo counties; frequent. March 14— Au- 

 gust 12. In coitu on the earlier date, motionless, heads downward 

 and ventral sides together. TVnen disturbed they dived quickly 

 and hid in the leaves and trash at the bottom of the water. 



XXII. Thermoxectes Esch. 1833. (Gr.. "a warm springs 



swimmer. ' ' ) 



Medium-sized, rather convex species resembling Acilius in ap- 

 pearance, but having the upper surface polished, smooth, or -with 

 but one to three dorsal rows of punctures ■ thorax without side mar- 

 gins; prosternal process bread and short ; hind tarsal claws unequal. 

 The front tarsi of the males bear two or three larger basal and 

 numerous small unequal disks on the lower side. The basal halves 

 of elytra of females are marked with numerous short, deep elongate 

 punctures. Two species occur in the State. 



453 (1495). Thermoxectes orxaticoi.lis Aube. Spec. Gen.. YI. 1S38. 140. 



Ovate, subconvex. Above dull yellow : bead with vertex and an M- 

 sbaped mark black ; thorax with two transverse black lines, tbe front one 

 tbe narrower ; elytra marked with many small black more or less confluent 

 dots, and an indistinct black bar behind the middle ; under surface reddish- 

 brown. Elytra each with two discal rows of rather distinct distant punc- 

 tures. Length 11.5-13 mm. 



Vigo County : rare. May 28. 



459 (1496). Thermoxectes basilaris Harr.. X. Eng. Far.. 1S2S ? 8. 



Ovate, subconvex. Above black ; head in front and a transverse line 

 on tbe vertex dull yellow : thorax with tbe sides and a narrow discal bar 

 of tbe same color ; elytra with the margins, a sub-basal cross-bar and some 

 vague markings on the sides yellowish ; under surface reddish-brown or 

 piceous, tbe front and middle legs paler. Elytra punctate as in ornaticoUis. 

 Length 9-10 mm. 



Lake. Marshall and Putnam counties; scarce, May 20- Au- 

 gust 15. 



XXIII. Grapijodeees Esch. 1S33. (Gr.. "write 4- skin.") 



This genus is close to .Thermonectes. The males have the front 

 tarsi as there, but have also the middle tarsi dilated and bearing two 



