174 GOIDE TO CALIFORNIA INSECTS. 



ily from the preceeding). Spondylidae: feet slender. 



Malachiidae: body with, extensile vesicles. 



Elaterid^: prothorax with spine fitting deep into a cavity on mesosternuvtK 

 anterior coxae round and ventral segments free. Throscid^: front coxal 

 cavities open behind. Cerophytidas: hind coxae not entirely covering femora. 

 Eucnemidae: labrum concealed. 



Coccinellidae: feet three-jointed. Sphaeriidae: only three ventral segments. 

 Mydroscaphidas: antennas eight-jointed. Monotomidae: last ventral segment 

 long. Trichopterygidae: elytra truncate. Endomychid^, Ptiliidae and Lath- 

 rididae: claws slender, the last two with feet slender, the last one with hind 

 coxae widely separated. 



Scarabaeidae: antennae lamellate. Lucanid^: plates of antennae immovable. 



Buprestidse: similar to Elateridae, but first tW'O ventral segments connate. 



Anthicidae: hind feet four-jointed, others five-jointed, antennae not clubbed. 

 hind coxae prominent. Monomidae: antennae in grooves. CEdemeridae, Mel- 

 andridae and Pythidae: head not strongly constricted behind, the first with 

 middle coxae prominent, the last with thorax not margined. Mordellidae and 

 Rhipiphoridae: thorax as wide as elytra, the latter with the lateral sutures oT 

 prothorax wanting. 



Histeridae: antennae elbowed. 



Anobiidae: head retractile, tarsi five-jointed, abdominal segments five and 

 front and middle coxse round hind -coxae transverse. Ptinidae: antennae 

 inserted on the front. Lyctidae: first ventral segment elongate. Ps^id3^: 

 head prominent. Bostrichidae: tibiar spurs distinct. 



Hydrophilidas: legs paddle-shaped, antennae clubbed. 



Dytiscidas: legs paddle-shaped. Grynidae: front legs largest. 



Meloidae: hind feet four-jointed, others five-jointed, antennae not clubbed. 

 Cephaloid^: head elongate tapering behind. Pyrochroidas: claws simple. 



Cantharidae: front coxae round, abdomen with seven to nine segments. Sty- 

 lopidae: antennae: not over six-jointed. 



Siiphidae: hind coxae prominent. Melyridae: metasternum short. Scyd- 

 masnidas: eyes coarsely granular. Clambidae: hind coxae lamellate. Anisi- 

 tomid^: front coxal cavities closed behind 



Nitidulidae: front coxffi transverse. Georyssidae: antennae nine-jointed. 

 Heterochroidas: four abdominal segments connate. Derodontidas, Byrridae, 

 Nosodendrid^, Drycpidas and Cupesidae: hind coxae hollowed out to receive 

 femora, the first with metasternum long, the second and third with it short, 

 the third having prominent head, the fourth with fifth joint of tarsi as long as 

 other joints combined. Sphindidae: metasternum long. Ostomidae: meta- 

 sternum emarginate behind. Dascyllidae: with hind coxae contiguous. Helod- 

 idas: front coxa without trochantin. 



Dermestidae: metasternum small. Byturidae: second and third tarsal joints 

 lobed beneath. 



Cleridae: feet with membramous appendage beneath. 



