Coleoptera. 33 



24. Front coxje with distinctly separated side-piece (trochantin). (Dascyllus.) 



DASCYLLIDiE 

 Front cox£E without trochantin 25 



25. Posterior coxae at most moderately dilated internally. (Cyphon) (PI. 7, figs. 



127, 129.) {CYPHONIDM.) HELODID^ 



Posterior coxse very large. (Eucinetus.) EUCINETID.^ 



26. Tarsi more or less dilated, the first joint not shortened, fourth joint very small; 



elytra usually not extending to the tip of the abdomen. (Carpophilus, / 



Omosita, Nitiduia) NITIDULIDjE 



Tarsi slender, metatarsus short; elytra entire, never truncate, covering the 

 abdomen. (Tenebrioides, Peltis) (PI. 7, fig. 135) {TROGOSlTlDjE, 

 TEMNOCHIlIDM.) OSTOMAXm^ 



27. First and second ventral segments fused or immovably united; antennse 



serrate (pectinate in the male of Xenorhepis; tarsi with membranous lobes 

 beneath; hard-bodied beetles, of more or less metallic color. (Chalcophora, 

 Chrysobothris [C. femorata. Flat-head orchard-borer], Buprestis, Agrilus) 



(PI. 5, fig. 98.) BUPRESTIDiE ^ 



All ventral segments free, except in very rare cases ' 28 



28. Prosternum prolonged behind into a process which is received in the meso- 



sternum 29 



Prosternum without such backwardly directed process 31 



29. Prothorax loosely joined to the mesothorax, freely movable, its hind angles 



usually prolonged backward into teeth; prosternal spine loosely received in 

 a notch in the mesosternum; front coxal cavities contained entirely in 

 the prosternum 30 



Prothorax firmly attached, not movable; front coxal cavities closed behind by V 



the mesosternum. (Drapetes, Throscus.) THR6SCID.ffi 



.30. Labrum visible; prosternum lobed in front; beetles' capable of mo\ing the 

 prothorax by its basal joint with a sudden clicking motion. Click-beetles, 

 Wireworm beetles. (Alaus, Elater, Melanotus, Drasterius, Limonius) (PI. \y'^ 

 7, fig. 126. 128.) ELATERIDiE 



Labrum concealed; prosternum not lobed in front; antennae inserted on the 

 front, somewhat distant from the eyes; not able to leap by the prothoracic 

 joint. (Fornax, Microrhagus) EUCNEMID.S 



51. Hind coxae in contact; body very small, convex, oval or rounded-oval. 



(Phalacrus, Olibrus.) PHALACRIDjE 



Hind coxae not in contact, although closely approximate in certain very much 

 flattened species 32 



52. Elytra shortened, leaving two segments of the abdomen uncovered, antennae 



elbowed, very strongly clavate; tibiae compressed, front pair usually toothed. 



(Hister, Saprinus, Hololepta) (PI. 7, fig. 141.) HISTEREDjE 



Elytra entire 33 



33. Tibiae dilated and toothed externally; large tropical beetles with strongly 



clubbed antennae. (Syntelia.) SYNTELIEDiE 



Tibiae simple or linear, at most the front pair somewhat dilated 34 



4 



