200 FAMILY III. — IIAIJl'LID.'E. 



'riirouulioiil llii- Slate; rr('(|ii('iil . Api-'il I'l I )(M'('iiil»('r IS. 



;!S1 (1209). A^'I.sol)At'TYLUS sericeus lliirr.. N. Eng. Far., 1828, 177. 



Obloug. Black, opaque; anteuiuTp reddish-brown; lemora piceoiis, tibia' 

 and tarsi i)ale. Tliorax l)roader tlian long, apex and base equal; sides regu- 

 larly curved, hind angles rounded, basal inqjressions obsolete; surface 

 sparsely i)Uiic1a;c. UKire densely at base and near the sides. Elytral inter- 

 vals Hat. densely imuctulate, each puncture bearing a short, fine hair. 

 Length 10 mm. 



Lake. Clarion, Vigo and Posey counties; fiwiuent. Pehi-iuiry 

 :^l-NoveHii)er 17. Noted on stems and Iturrowing l)cneath the roots 

 iif grasses and sedges about ponds. Also taken at electrie light. 



*3S2 (1210). Anisodac'tylus iNTERSTrriALis Say, Trans 

 Amer. Phil. See., II, 1823, 57; ibid. 11, 

 480. 

 Form and structure of sericeus. Color as given in 

 key. Thoracic margin broader, more depressed; me- 

 dian line and basal impressions evident, the latter 

 lir<.ad and shallow. Flytral intervals subconvex, densely 

 and rather coarsely punctate. Length 0.5-10 mm. (Fig. 

 101.) 

 101. -, 2i. (Ongiiia!.^ Throiigliout the State; common, especially in 

 sandy regions. March 17-Deceml)er IS. A half dozen just 

 emerged as imagoes were noted on November 28. 



Family 111. HALIP]dD.E. 

 The Crawling Water Beetles. 



In the North American fauna this family is represented by less 

 tlian 'M) known species of small, very convex aipiatic beetles. In 

 color they arc light brownish-yellow, more or less spotted with 

 Mack, while in I'onii they ai'e oval and tapering at each end. The 

 elyli'a \)v;\r rows oi punctures and the seutelliim is invisible. 



They comprise a family intermediate between the Carabidie and 

 Dytisciche, having the antemuv glal)rous. filiform, 10-jointed and 

 inserted on the front befoi'c the eyes; thora.x with distinct side 

 pieces; hind co-xie contiguous at middle and i)rolonged as broad 

 plates which conceal the basal half of hind femora and from three 

 to six of th(> ventral segments. The slendei- but clubbed hind fe- 

 mora move between these plates and the abdomen, and are not 

 adapted to vigorous svi^imming. 



Although a(|uatic in habit, these little beetles swim but feebly. 

 Where found they usually occur in numbers. They live in shallow 

 water about the margins of ponds, lakes and pools of streams, where 



