'nil': WA'iMCK sdAVKNGEi; i!i:i;'ri:i:s. 247 



Siihs. li.s I). TLIMEUA (/.AVICORNIA. 



'I'lic iiu'iiilici's dl' this uriiii|) linvc '\\r tnrsi all I'-joiiitcil and the 

 Nciilral sc^iiu'iits IVt'c. They li\c cillhT in ruii<;i or I't'i'd upon plant 

 lii'(\ The t'oliovvinii' rainilics of llic suhsci-ics arc )•( presented in llu; 

 State: 



KEY TO INDIANA lAMII.IKS OK TIUMKKA CI^WICOKN I A. 



(I. Wings fringed witli long Iiairs; alulonien not prolonged ;nul with G nr T 



ventral segments; antenn:e with the basal and apical joints thicker 



than the middle cncs, the latter witli wliorls of hmg hairs; length 



less than L' mm. Faniilv XII. 'tiMcnoi'TKitvoio.K. p. 4sr). 



(/(/. Wings nnl Iringcd. 



I). Tarsi witli sccnnd jipjni dilated: third Jniiil cdiisisting really of two 

 joints, tlie smill true third joint lieiiig inserted at the base of the 

 last joint, 

 r. Tarsal claws dilated or loethcd at base: first ventral segment with 

 coxal lines: rnriii usually rounded and convex; head nearly con- 

 cealed by liie tliorax: last joiid of maxillary i)alpi usually 

 hati-liet-sliaped : length less than s..") mm. 



family WI. Coccinki.i.U).!:. p. T^>V,. 

 (■<■. Tarsal claws simple: first venfi-al witlmul ciixal lines; form oblong 

 or oval, rarely globose: last jniul nf maxillary jialpi oval or tri- 

 angular; length less than (■>.."■> mm. 



Family .Wll. Ivnuom "Kn in. i:. \k .".:;:;. 

 hi). Tai'si with si-eimd joint not dilated and without a jiseudo fourth 

 joiid. 

 il. Elytra eidire: veidral segments nearly e<|ual ; front coxal cavities 

 rounded, not pr<. longed on the outer side; length U'ss than .". nmi. 

 Family XXVII. Lathkidiid.i:. p. (Sol. 

 (hi. Elytra truncate behind, leaving the pygidium exposed; ventral seg- 

 ments 1 and 5 longer than the others; front eoxre small, rounded; 

 length less than 8 mm. Fannly XXIX. Monotomid.e, p. GOG. 



Family VI. HYDROFIITLID.E. 

 The WxVter Scavenger Beetles. 



This Faiiiil\- comprises, for the most part, oval or elliptical black- 

 ish beetles, differing from tlio Dytisei(he in being more convex, in 

 having the ant(Mni-p onding m a dislitict cliilt instead of being fili- 

 form, and iff poss-'ssitig i)al]n whicli arc nsnally longer than the an- 

 tennffi and are jircjected forward while swimtiiing, while the an- 

 tennae are usnally concealed beneath the head. By the inexperi- 

 enced student llie pali)i a.re. therefore, ofteti mistaken for the an- 

 tenna-. 



The name of tlie family is derived from the genus II ijdropliilKS, 

 a word of Greek origin meaning "a lover of water." As the name 



