26 



CURCUL10N1]).K. 



Classification. 



Apart from Lacordaire's work, the only serious attempt to- 

 devise a comprehensive clas.siti cation of the Curculionidie is that 

 made by Leconte and Horn (Gr. H. Horn, Trans. Amer. Phil. 

 Soc. 1873, p, 407; J, L. Leconte, Amer, Natural, viii, July, 

 lt74, pp. 385 and 452; Leconte and Horn, Proc. Amer. Phil. 

 Soc. XV, 1876, p. xi), and this was founded almost entirely on 

 a study of New World species only. The principal divisions 

 adopted by these two authors were as follows :■ — 



1 (12) Abdomen dissiniiiar in the two sexes, c? 



with an additional Hual segment; elytra 

 with an acute lateral fold on the lower 

 surface Allogastua. 



2 (11) Antennfie with an annulated or solid club, 

 y (8) Tarsi narrow, setose. 



1 (7) Gular margin very prominent, nieutuni 

 retracted. 



o (G) Presternum not excavated Amycteridae. 



(5) Prosternum excavated Byrsopidae. 



7 (4j Gular margin not prominent, uientum 



large Brachyceridje. 



8 (3) Tarsi dilated, usually witli a brush of 



hairs beneath. 



9 (10) Mandibles with deciduous tip, leaving a 



scar Otiorrhynchidse. 



10 (9) Mandibles simple, usually pincer-shaped. . Curculionidae. 



11 {'2) Antennai with 11 separate joints Brenthidae. 



12 (1) Abdomen similar in the two sexes. 



13 (18) Elytra Avithout any lateral fold on the 



lower surface Haplogastka. 



14 (15) Labrum distinct ; mandibles Hat, simple. . Rhinomaceridae. 

 lo (14) Labrum wanting. 



1() (17j Mandibles tlat, toothed on outer and inner 



edges Rhynchitidae. 



17 (16) Mandibles stout, pincer-shaped Attelabidae. 



15 (13) Elytra with a distinct lateral fold on the 



lower surface Heterogastka. 



19 (22) Pygidium vertical or declivous. 



20 (21) Antennse genicidate, clubbed; labrum 



wanting ; last spiracle covered by ven- 

 tral segments Calandridae.* 



21 (20) Autenn;e straight ; labrum distinct ; last 



spiracle not covered by ventral seg- 

 ments "^ Anthribidae. 



22 (19) Pygidium horizontal, smaller. 



23 (24) Antennas geniculate, clubbed Scolytidae. 



24 (23) Antenme straight. 



2o (26) Ventral segments very unequal ; antennas 



with annulated club Apionidae. 



26 (25) "N'entral segments nearly equal ; antenuse 



with eleven separated joints. . Belidae. 



* Tnckidini' tlie CossoNiN.t;. 



