474 AN INTRODUCTION TO ENTOMOLOGY 



AAA. All tarsi four- jointed. (See also A AAA.) 



B. The first four abdominal segments grown together on the ventral side. 

 C. Tibiae dilated, armed with rows of spines, and fitted for digging, p. 505. 



• • • • Heterocerid^ 



CC. Tibiae neither dilated nor fitted for digging. 



D. Antennae inserted under a distinct frontal ridge ; anterior coxae distant 



from the metasternum. p. 510 Colydiid^ 



DD. Antennas inserted on the front ; anterior coxae inclosed behind by the 



metasternum. p. 511 Murmidiid^ 



BB. Ventral segments of abdomen not grown together. 



C. Anterior coxae transverse, p. 511 MvcET^iDiE 



CC. Anterior coxae either globose or oval. 

 D. Anterior coxae globose. 



E. Tarsi slender, p. 51 1 Endomychid^e 



EE. Tarsi more or less dilated and spongy beneath, p. soq.Erotylid^ 

 DD. Anterior coxae oval. 



E. Anterior coxs separated by the horny prosternum. 



F. Body depressed; head free. p. 510 Mycetophagid^ 



FF. Body cylindrical; thorax prolonged over the head. p. 515. 



ClSID^ 



EE. Anterior coxae contiguous ; prosternum semimembranous, p. 505. 



Georyssid^ 



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

 middle tarsi also, with five segments. 

 B. Anterior coxal cavities closed behind. 

 C. Tarsal claws simple. 



D. Abdomen with five ventral segments. 



E. Ventral abdominal segments in part grown together. 



F. Next to the last segment of the tarsi spongy beneath, p. 514. 



Lagriid^ 



FF. Penultimate segment of tarsi not spongy, p. 513. TenebrioniD/E 

 EE. Ventral abdominal segments free. 



F. Anterior coxal cavities confluent, p. 498 Othniid^ 



FF. Anterior coxal cavities separated by the prosternum. 



G. Elytra truncate; tip of abdomen exposed, p. 5o8.RHizopHAGiDiE 



GG. Elytra entire, p. 515 SpHiNDiDiE 



DD. Abdomen with six ventral segments, p. 498 Eurystethid^ 



CC. Tarsal claws pectinate, p. 512 Alleculid^ 



BB. Anterior coxal cavities open behind. 



C. Head not strongly and suddenly constricted at base. 

 D. Middle coxae not very prominent. 



E. Antennae received in grooves, p. 514 Monommid^ 



EE. Antennae free. 



F. Prothorax margined at the sides. 



G. Middle coxal cavities entirely surrounded by the sterna, p. 510. 



Cryptophagid.*; 



GG. Epimera of mesothorax reaching the coxae. 



H. Metasternum long; epimera of metathorax visible, p. 514. 



MELANDRYIDiE 



HH. Metasternum quadrate; epimera of metathorax covered. 



p. 509 CuCUJIDiE 



FF. Prothorax not margined at the sides, p. 498 Pythid^ 



DD. Middle coxae very prominent, p. 494 CEdemerid^ 



CC. Head strongly constricted at base. 



D. Head prolonged behind and gradually narrowed, p. 494.CEPHALOID.E 

 DD. Head suddenly narrowed behind. 



E. Prothorax with the side pieces not separated from the pronotum by a 

 suture. 



F. Prothorax at base narrower than the elytra. 

 G. Hind coxae not prominent or but slightly so. 



H. Anterior coxae globular, not prominent, p. sog.CucujlD^ 



