INTBODUCTIOX. 



Ke{i to the Families. 



(2) Tarsi apparently o-joiuted, joint 2 



bilobeel [Aglyoyderid.b 



and Proterhimdje]. 



(1) Tarsi apparently 4 -jointed, the 

 minute additional joint (4t]i) very 

 rarely Avell-developed so that the 

 tarsi are o-jointed {Dnjophthorus, 

 CossoNiNiE), joint 3 more or less 

 dilated or bilobed. 



(4) Palpi normal, flexible ; labrum dis- 

 tinct ; pronotum with the lateral 

 margins carinate Anthribid.^. 



(3) Palpi very short and rigid * (fig. 2) ; 



labrum absent or concealed f ; the 

 margins of the pronotum not car- 

 inate |. 



(8) Head produced into a rostrum, at 

 least in the female § ; tibiie never 

 denticulate externally. 



(7) Antenn:^ without a terminal club, || 

 never geniculate ; the general form 

 invariably narrow and elongate ; 

 metasternum at least as long as 

 broad ; segment 2 of the venter 

 much longer than 3 and 4, and 

 fused with 1 in the middle ^ .... Brenthid.e. 



(G) Antenn;e with a terminal club,** 

 the joints of which, with com- 

 paratively few exceptions, are com- 

 pact ; antennae usually geniculate, 

 but often straight ; metasternum 

 almost always broader than long : 

 those forms in which the meta- 

 sternum is long and the antenn?e 

 straight have segment 2 of the 

 venter not longer than 3 and 4, 

 and separated from 1 by a distinct 

 suture CuRCULiONiD.?:. 



(5) Head never produced into a rostrum ; 



tibiae denticulate externall} Scolytidje. 



* Except ill EniNOMACERiN.E (OuRCULioNiDyE), iu which also the labrum is 

 distinct. These insects differ from the Antiiribid.e in having two gular 

 sutures, distinct prosterual sutures, the front coxae elongate and the median 

 coxal cavities open. 



t Except in Ruinomacerin^ and some Pi.ATYi'ODiNiE. 



I Except in Oxycorynus and Pterocolus (Curculionid.e), and in Scolytus. 



§ Except in Sebasius and Aprostoma (Brenthid-e), the latter having the 

 last joint of the maxillary palpi hatchet-shaped. 



il Except in most Tai'ihioderin-e and a few Traciielizin.e, but in thoje 

 the club is always formed of three quite separated joints. 



*\ Except in Nothogaster, Lac. 



** Except in Beline. 



B 2 



