110 Mr, Malcolm Burr’s Preliminary Revision of the 
tuberculatum ; 9, angustius, simplicius: pygidium parvum, glo- 
bosom, vel valde productum, acuminatum, vel nullum ; forcipis 
bracchia ¢ in parte basali valde deplanata et dilatata, hac parte 
dilatata margine interno seepe crenulata et dente terminata, vel 
inermi ; dehinc attenuata, subrecta, aut arcuatim curvata et inermia ; 
2 subrecta, subcontigua, inermia. 
This large and homogeneous genus is well characterised 
by the forceps of the male, in which the branches are 
flattened and broadened in the basal portion, as in the 
familiar typical species, #. auricularia, Linn. It contains 
a large number of species occurring in various parts of the 
Old World. 
It is the typical genus of the Order, and in the typical 
species, F. awricularia, Linn., the characters are very well 
marked. The genus is represented in nearly every part of 
the globe, but the species are most numerous in the Old 
World. The discrimination of the species is often rather 
subtle, and the shape of the forceps must be employed with 
care and discretion ; these vary considerably in length, 
showing the two forms macrolabia and cyclolabia; the 
latter appears to be the normal form, and the former a 
more virile robust race ; in the common species, the macro- 
labia form appears to occur chiefly in islands and in moun- 
tains, and the ordinary form is more semi-domesticated in 
its habits. The elongation of the forceps is generally 
accompanied by the more robust build of body, and it also 
modifies the armature of the forceps, owing to the drawing 
out of this organ. The degree of curvature also varies, 
more especially in F. lwrida, which gives the different 
varieties a very different appearance, which is often mis- 
leading, 
The type of the genus is Porficula auricularia, Linn., 
Syst. Nat. (ed. x) i, p. 423 (1758). 
TABLE OF SPECIES. 
1. Pronotum latius quam longius, trapezoi- 
dale. 
2. Foreipis bracchia tantum in parte 
basali dilatata et deplanata. 
3. Foreipis bracchia fortiter extus ac 
intus flexuosa, inermia; (colore 
toto atro ; glabra; species Indiz 
borealis) . . . 6. p+ gy) J]. Schlagintweiti, Burr, 
