HETEROGYNA — FORMICIDiE. 95 



5.— Antcnnse 9-jointed, 8i-ai)e long, first joint of fiinicle longer than the two 

 following united, apical joint large, fusiform; head emarginate poste- 

 riorly; clypeal and antennal fovese confluent; cljpeus very convex, 

 hood-like, partly hiding the mandibles; frontal carinae short; frontal 

 area triangular ; thorax small, short; metathorax broader than long; 

 petiole of abdomen slender at tip and strongly inclined forward ; wings 



9 without discoidal cell Brachyrnyrmex Mayr. 



Aiitennfe 12-jointed 6. 



6. — IJasal joints of the funicle, except the first, shorter than the others ; ocelli 

 indistinct or wanting in 5 : frontal area superficially impressed, almost 



twice broader than high 7. 



Basal joints of funicle as long or longer than the others (the last «;xcepted) ; 



ocelli very distinct; frontal area sharp',;,* ^"iined 8. 



7.— Clyi)eal foveae not confluent with antennal t ic; scale quadrangular or 

 cuneiform, oblique, directed upwards aud forwards; abdomen tapering 

 to a point, enlarged and strongly convex above at base, touching upper 



posterior part of scale; ocelli wanting in ^ Prenolepis Mayr. 



Clypeal foveae confluent with antennal foveas ; scale vertical or nearly so. 

 quadrangular and straight ; abdomen not prolonged anteriorly : ocelli 



very small, indistinct or wanting in ^ l<asiut* Fabr. 



H. — Frontal carinse diverging posteriorly, the external margin slightly convex ; 

 fourth joint of maxillary palpi slightly longer than the fifth ; scale large, 

 vertical ; wings 9 extending beyond apex of abdomen, with one large 



discoidal cell, rarely wanting Formica Linn. 



Frontal carina nearly parallel, the external margin concave; fourth joint 

 of maxillary palpi almost twice as long as fifth ; petiole with a node or 

 thick scale ; wings 9 with the discoidal cell very small or wanting. 



9f yrmecocystns Wesm. 



9.— Metathorax cubical, the horizontal face nearly flat or slightly convex, the 



vertical face concave, their point of union forming a crest terminated on 



each side by a tooth ; clypeus impressed on middle of anterior margin ; 



scale thick, cuneiform, strongly inclined forwards; wings 9 with two 



complete submarginal cells Dolichoderns Lund. 



Metathorax not cubical, convex, unarmed, the declivous face flat 10. 



10. —Clypeus with anterior margin entire ; ocelli distinct in both sexes; abdomen 

 not prolonged in front, the ])etiole with an oval, erect scale, roundt-d 

 above, where it is often emarginate in 9 ! wings 9 with two submar- 

 ginal cells Uometopnni Mayr. 



Clypeus rather deeply notched on middle of anterior margin ; ocelli al)sent 

 in 5 , distinct in 9 ! abdomen enlarged anteriorly, covering the petiole 

 by a prolongation of its basal part, petiole quadrangular, flat, without 

 apparent scale, terminated in front by a transverse thifkencd edge ; wings 

 9 with but one complete submarginal cell Tapinoma Fiirst. 



Mules. 

 Clypeus not prolonged backwards between insertion of antennte ; tibial spurs 

 simple ; wings with only one submarginal cell, with or without di.scoidal 



cell -2. 



Cly{)eus extending more or less between insertion of antennfe; tibial spurs pec- 

 . — tiuate 8. 



