HETEKOGYNA — MYRMICIU.E. 101 



First joint of petiole not ciibical, naiTowed and cylindrical at base, notli- 



form at hihjx 6. 



6. — Antennte 11-joiiited. clul> very lartif. 2-.jointed ; clypeus with two longitu- 

 dinal carina; ; nietathorax nnarnied; one complete siihnuir^cinal and one 



discoidal cells, niar>:inal cell ojien at apex NoleiiopNiH VVestw. 



Antennie 11- I'i -jointed, with the diih more than ;2-jointed, or without dis- 

 tinct club 7. 



7. — First .suhmargiual cell divided by an abbreviated longitudinal nervure; 

 frontal area acute at base: tibial sjturs pectinate; win^s with one com- 

 plete subniarginal cell Tlyrinica I^tr. 



First submarginal cell not divided 8. 



H. — Mandibles broad, their apical margin acute, without teeth, or with only two 

 teeth anteriorly ; frontal groove extending as far as the occiput : an- 

 tennte 12-jointed, with the 3-joiuted club longer than half of funide ; 

 thorax broad, depressed above; metathonix bidentate; second joint of 

 petiole transverse, subtuberculate laterally; maxillary and labial palpi 



2-jointed Plieidole Westw. 



Mandibles broad, triangular, their anterior margiu pluridentate 9. 



9. — Last three joints of funicle together distinctly shorter than the preceding 



joints combined 10. 



Last three joints of funicle together as long or longer than the preceding 



joints ctmibined 11. 



10.— Frontal area distinctly impressed, obtusely rounded above ; autennee 12- 

 jointed. without distinct club; maxillary palpi 4-jointed. labial palpi 

 3-jointed. 

 Marginal cell incomplete, two complete submarginal cells. 



Aphtenogaster Mayr. 

 Marginal cell comi)lete, one (or two?) complete submarginal cells. 



Pogononiyrinex Mayr. 



Frontal area indistinct or wanting; antenna? 11-12-jointed, with a distinct 



3-jointed club; maxillary i)alpi o jointed, labial palpi 3-jointed; one 



complete submarginal and one discoidal cells, marginal cell very short, 



rounded apically lieptothorax Ma>r. 



11. — Lateral basal margin of clypeus distorted or elevated between frontal carinse 



■ and insertion of mandibles, forming a projecting ridge ; second node of 



petiole strongly transverse, almost twice a^s broad as long ; nietathorax 



bidentate ; antenna; 12-jointed, club distinct, apical joint as long as the 



two preceding united ; maxillary palpi 6-jointed, labial palpi 3-jointed. 



Tetramorium Mayr. 

 I.iateral basal margin of clypeus not distorted or elevated ; second joint of 

 petiole not twice a.s long as broad. 

 Metathorax entirely unarmed ; antennie 11-12-jointed, with a distinct 3- 

 jointed club ; clypeus viewed laterally protuberant, overhanging the 

 base of mandibles ; thorax narrow, elongate, rather higher than broad ; 

 one complete submarginal cell, no discoidal ; maxillary and labial palpi 



2-jointed Monomorinin Mayr. 



Metathorax armed with two short, triangular, acute teeth ; antennte 12- 

 jointed, funicle gradually thickened from base to apex, not forming a 

 distinct club; frontal area narrow, elongate, forming an obtuse angle 

 _ . with clypeus, which has two longitudinal median carinte ; one long com- 



