234 FAMILY IV. DYTISCIIXK. 



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

 and should therefore occur in the State. 



457 (14!):!). Aciurs FKATEKISTS llarr.. New Eng. Far., 1X2'.), S. 



Close to 8('iixnlctttiiN. lint a little larger, darker and more densely 

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

 18-14.5 mm. 



Marion, Putnam and Vigo '-ounties; frequent. March 14-Au- 

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

 and ventral sides together. When disturbed they dived quickly 

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



XXII. TIIERMONECTES Esch. 1833. (Gr., "a warm spring 4 



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. 



45X (1405). TIIERMONECTES ORNATICOI.LIS Aube. Spec. ({en.. VI. is.'JS, 14O. 

 Ovate, subconvex. Above dull yellow; head with vertex and an M- 

 shaped mark black; thorax with two transverse black lines, the front one 

 the narrower; elytra marked with many small black more or less continent 

 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 11.5-18 mm. 



Vigo County; rare. May 28. 



450 (1490). TiiKUMOM-x"! KS ijAsiLARis llarr., N. Eng. Far.. ISI'X, 8. 



Ovate, snbconvex. Ab:.ve black; head in front and a transverse line 

 on the vertex dull yellow; thnrax with the sides and a narrow discal liar 

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

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

 piceous, the front and middle legs paler. Elytra punctate as in tirmitiroUix. 

 Length 0-10 mm. 



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

 gust 15. 



XXIII. GRAPHODERER Ksch. 1833. (Gr., "write -> skin.") 



This genus is close to Tlu-nnoHccfrx. The males have the front 

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



