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. 429.] THE FAMILY OF FORMICIDE. 715 
Clypeus almost always prolonged between the frontal carina, which 
are more or less separated; in the — case, the antenna are 
II- 
-jointed 
. Clypeus suddenly discendingd in Troet, or as if inflected c or pubtrüicatéd, 
usually armed with teeth at the level of this inflection ; rarely it is 
uniformly sloping and deeply emarginate at the anterior border 
(Africa, Asia, Oceanica) . . Sima Roger 
Clypeus neither inflected nor deut. not or duly ieebly emarginate 
(America) . . . . Pseudomyrma Guerin 
. Antenne 7-jointed, withe&t 3 a distinct club (13-jointed in the male) ; 
frontal carinz, as usual, distant from the lateral borders of the head ; 
thorax spinose (tribe. Myrmicarii) . Myrmicaria Saunders 
Antennz of a different conformation Grien 7- ioiai the last joint is 
enlarged or forms part of a differentiated club, or the scape may be 
enclosed in a deep groove, or the thorax is without spines) 
4 
. Antennal fovea or groove placed at the side of the head; the carina 
formed by its dorsal margin (and which does not poreapoíud to the 
frontal carina of other ants) passes outside of the eye; posterior 
angles of the head pointed or prolonged or denticulate; antennz 
I1-jointed in all the sexes yn oup . Cataulacus F. Smith 
Of a different conformation 
5 
. The antennal fosse terminate behind on thé: dia bi the ek pass 
above the eye and are sufficiently deep to conceal the whole antennal 
scape ; antennz I I-jointed, without differentiated club ; gizzard a 
form, of peculiar structure (tribe Cryptocerii) (America) . 6 
nissan] fosse differently placed, or the antennz of a diferent « con- 
formation ; gizzard of the usual form . 7 
Antennal foveæ approximated in front, P ES male behlüi, not 
reaching the sides of the head except at their extremities 
Procryptocerus Emery 
Antennal fovez covered throughout their length by the lateral border 
of the head Cryptocerus Fabricius 
Postpetiole aricadated to Abe ind Putas ot y a segment 
(tribe Crematogastrii) . Tet atogaster Lund 
Postpetiole inserted at the anterior pem e the Ab asi segment . 8 
- Head cordiform, emarginate behind, with the posterior angles strongly 
rounded and devoid of spines; last joint of antenna very much 
smaller than the preceding joint (tribe Dacetii) . . . . . . 9 
Head of a different conformation Zo secs d. e x RS 
Antennal fovez short; antenne irjeined au S I 
Antennal foveæ as long as the sc d a 
- Only the last joint of the antennz gum saa the receding joint 
Daceton Perty 
Last two joints of the antennz longer than the graine g 
Acanthognathus Mayr 
