KEY TO FAMILIES OF SERRICORNIA: 687 



e. Hind coxa! plates with grooves for the reception of the femora 

 in repose. 

 /. Front" coxae globose. 

 if. Thorax loosely jointed, its hind angles usually prolonged 

 backwards; prosternal spine loosely received in a notch 

 in mesosternuin. so as to admit of a springing motion ; 

 front coxal cavities entirely surrounded by the pro- 

 sternum. Family XXXVII. Elaterid.e. p. <"»iH». 

 gg. Thorax firmly attached to the remainder of the body; pro- 

 sternal spine prolonged but not movable; front coxal 

 cavities closed behind by the mesosternum ; length less 

 than 5 mm. Family XXXVIII. Throscid.e. p. 77."5. 

 if. Front coxa? transverse. 



//. Onychium (pad between the tarsal claws) large and hairy ; 

 antenna? of males usually flabellate ; length 11 or 

 more mm. Family XXXVI. Rhipkeridje. p. 696. 



lih. Onychium small or wanting. 



i. Head constricted behind : eyes smooth ; flanks of thorax 

 (in our species) excavated for the reception of the 

 front legs; body- .covered with small scales. 



Family XLV. Ccpesiile. p. S92. 

 li. Head not constricted behind ; eyes granulated. 



./'. Epimera of mesothorax reaching the middle coxa?; 

 body coverings rather soft and flimsy; form usually 

 oval or hemispherical, convex ; length less than 

 6.5 mm. Family XXXV. Dascyllidje. p. 6SS. 



/./'. Epimera of mesothorax not reaching the coxa?; pro- 

 sternum very short : thorax usually extending as a 

 form of hood above the head, the latter bent under 

 and rarely visible from above : length less than 

 7 mm. Family XLIII. Ptixtd-E. p. S62. 



ee. Hind coxal plates not grooved. 

 k. Hind coxa? flat. 



I. Presternum not prolonged behind; tarsal joints 1-1 with 



membranous lobes beneath, the first joint often indis- 

 tinct. Family XLII. Clerid.e. p. 846. 



II. Presternum prolonged behind. 



m. Front coxal cavities entirely surrounded by the pro- 

 sternum : hind coxa? without plates ; trochanters of 

 middle and hind legs very long. 



Subfamily (XXXVII ). Oerophytinw, p. 773. 

 mm. Front coxal cavities partly formed by the mesosternum: 

 antenna? without club : length less than 4.5 mm. 



Genus ( XXXVITI). Dra petes, p. 774. 

 1:1c. Hind coxa? prominent. 



tii Front coxa? conical, prominent, without trochantin : tarsi 

 slender ; form elongate, narrow : length 10 or more mm. 

 (only 2.2 mm. in Micromaltlius) . 



Family XLV I. Eymexyloxid.e. p. 894. 



[44—23402] 



