COLEOPTERA 471 



I. Eyes with large facets, p. 486 Brathinid^ 



II. Eyes with small facets, p. 487 SilphiDyE 



BB. Hind tarsi either only three-jointed or four-jointed, but apparently three- 

 jointed, the third segment being small and concealed in a notch at the end of 

 the second segment. (See also BBB and BBBB.) 



C. Abdomen with six or seven ventral segments. 



D. Tarsi four-jointed, the third segment small and concealed in a notch 



at the end of the second segment, p. 488 CorylophiD/E 



DD. Tarsi three-jointed, p. 490 TRiCHOPTERVGiDiE 



CC. Abdomen with only three ventral segments, p. 490 . SPHyERiiD^E 

 BBB. All tarsi four-jointed. (See also BBBB.) 



C. Hind coxae contiguous and with plates covering the femora entirely 



or in part. p. 487 Silphid/E 



CC. Hind coxae separate and not covering the femora, p. 488 Corylophid^ 



BBBB. Hind tarsi with only four segments; the fore tarsi, and almost always 



the middle tarsi also, with five segments, p. 487 Silphid^e 



TABLE IV.— THE FAMILIES OF THE PALPICORNIA, POLYFORMIA, 

 AND CLAVICORNIA 



It is impracticable to separate these three series of famihes in these tables, 

 owing to the fact that characters sharply separating them have not been found. 

 A. Hind tarsi five-jointed. 



B. Maxillary palpi as long as or longer than the antennae, p. 485 Hydrophilid^ 

 BB. Maxillary palpi much shorter than the antennas. 



C. Tarsal claws very large; the first three abdominal segments grown 

 together on the ventral side. 

 D. Abdomen with more than five ventral segments; anterior coxae 



with very large trochantin. p. 503 Psephenid^ 



DD. Abdomen with five ventral segments. 



E. Anteriorcoxae transverse, with distinct trochantin. p.504.DRYOPiDyE 

 EE. Anterior coxae rounded, without trochantin. p. 504...Elmid^ 

 CC. Tarsal claws of usual size; ventral abdominal segments usually free, 

 sometimes (Buprestidae) the first two grown together. 

 D. Abdomen with not more than five ventral segments. 



E. Femur joined to the apex or very near the apex of the trochanter. 



F. Antennae inserted upon the front, p. 514 Ptinid^e 



FF. Antennae inserted before the eyes. 



G. Tibiae without spurs, p. 514 ANOBiiDiE 



GG. Tibiae with distinct spurs. 



H. First ventral segment scarcely longer than the second, 

 p. 515. BOSTRICHID^ 



Hfl. First ventral segment elongated, p. 515 Lyctid^e 



EE. Femur joined to the side of the trochanter. 



F. Anterior coxae globular or transverse, usually projecting but 

 little from the coxal cavity. 

 G. Anterior coxae transverse, more or less cylindrical. 



H. Posterior coxae grooved for the reception of the femora. 



I. Legs stout, retractile; tibiae dilated, usually with a ftirrow 

 near the outer end for the reception of the tarsi; tibial 

 spiirs distinct. 



J. Antennae inserted at the side of the head. 



K. Head prominent, mentum large, p. 508. NosoDENDRlD^ 

 KK. Head retracted, mentum small, p. sgS.Byrrhid^ 



JJ. Antennae inserted on the front ; head retracted, p. 506. 



CHELONARIIDiE 



II. Tibiae slender, with small and sometimes obsolete terminal 

 spurs, or without spurs. 



J. Head constricted behind; eyes smooth, p. 494.CUPESID/E 

 JJ. Head not constricted behind; eyes granulated. 



