RHYNCHOPHORA. 105 
The following table shows the method of subdivision as given by 
Leconte and Horn (1. ¢. p. xv.): it rests chiefly on the structure of the 
pygidium, and the presence or absence of a peculiar ridge on the inner 
surface of the elytra, into which the ascending margin of the metathoracic 
epimera and ventral segments fit. 
I. Pygidium alike in the male and female, formed of a 
single piece ; a without lateral fold on inner 
surface. . Sie) te a st EC ALLO GAGA 
cag ees distinct, mandibles flat, simple ce . « RHINOMACERIDE. 
. Labrum wanting. 
wat Mandibles flat, toothed on outer and inner edge . RHYNCHITIDE. 
2. Mandibles stout, pincer-shaped. . ATTELABIDE. 
If. Pygidium unlike in the male and Pomale. eated be 
two distinct segments ; elytra with an acute lateral fold 
on the inner surface . ee oe Co LOGASTR Aj 
. Antenne with annulated or : solid club. _ 
1. Tarsi narrow, setose; prosternum excavated . . (BYRSOPID#®.) 
2. Tarsi dilated, ‘usually with a brush of hair 
beneath. 
A. Mandibles with deciduous tip, bearing a scar OTIORRHYNCHIDH. 
B. Mandibles without sear, usually pincer-shaped = CuRCU!IONIDE. 
ii, Antenne with ten or eleven distinct joints . (BRENTHID®. ) 
III. Pygidium alike in the male and female, formed of a 
single piece; elytra with a distinct lateral fold on the 
inner surface. . Peet edieens, DELELMROGASRER A 
i. Pygidium vertical or declivous. 
1. Antenne geniculate, clubbed; labrum wanting; 
last spiracle covered by ventral segments. . . CALANDRID®. 
2. Antenne straight; labrum distinct; last spiracle 
not covered by ventral seginents; pygidium deeply 
notched to receive sutural apex of elytra . . . ANTHRIBIDH. 
ii. Pygidium horizontal, smaller. 
1. Antenne geniculate, clubbed ; terminal edge of 
last ventral segment acute, surrounding the last 
dorsal ; tibize generally compressed and serrate SCOLYTID#. 
2. Antenne straight, with annulated club; maxille 
very large, palpi and ligula feeble . . . . . APIONIDA. 
Although the table is of considerable value, yet it can hardly be 
regarded as altogether accurate; as pointed out by Bedel, the genus 
Apion, which is “placed in the Heterogastra, has the pyg gidium in the 
male composed of two segments as in the Allogastra, and some of the 
Haplogastra, as, for instance, Byctiscus, have the lateral fold on the 
inner surface of the elytra as fully developed as in the Allogastra, aud 
doubtless several other exceptions could easily be discovered. 
In discussing the question of the Classification of the Rhynchophora 
we can hardly omit some reference to the work of Lindeman (Bull. 
Mose. LI., 1876, pp. 159, &c.); this author separates the families on 
the presence or absence of a mechanical digestive apparatus in the 
gizzard ; this is wanting in the Anthribide, Brachide, Rhinomaceride, 
Attelabide and Apionide, but is possessed by the remaining tribes ; 
it ordinarily consists of longer or shorter plates (Kauplatte), (usually 
