lUU GENERA OF llVMENOl'TERA. 



11.— Thorax strongly constricted between meso- and metathorax ; mandibles very 

 broad; frontal area small, cU-arly defined; antenna? 12 jointed I the 

 major worker has the head enormously develo^jed. short, more than 

 twice as broad as the tliorax, the frontal jrroove very deep, traversing 

 the vertex and dividinji the hack of the head into twn convex lobes). 



Plicidolc Westw. 

 Thorax sliirhlly or not at all strangulated between the meso- and meta- 

 thorax. 



Lateral basal margin of clyi)cus distorted or elevated between frontal 

 carina} and insertion of mandible.s, forming a ])rojecting ridge; thorax 

 short, erect, slightly impressed between meso- and metathorax, protho- 

 rax with the shoulders angular, metathorax with two s])ines; tibial 

 spurs simple; anteinue 12-jointed ; maxillary jialpi 6-joiiited, labial 

 palpi 3-jointed Tetraiiioriiiiii Mavr. 



Lateral basal margin of clypeus not elevated; thorax elongate, more than 

 twice as long as high, little or not impressed between meso- and meta- 

 thorax, ])rothorax with shoulders rounded, metathorax with two spines; 

 no tibi;il si)urs : antenna' 11 -12-jointed : froTital area not clcaily defined ; 

 maxillary palpi .j-jointed, labial jialpi .■J-jointed.L.eplotllorsi.v Mayr. 



Females. 

 Antennal fovea* terminated outwardly l)y a carina ; clyi)eus interposed between 

 insertion of antenna-; frontal carinse placed in middle of anterior part 

 of the head ; antennte 11-jointed ; head triangular, with a small tooth 

 on each side behind ; thorax viewed fn)m above large, ovate; metatho- 

 rax with two small teeth ; abdomen subglobose, second joint of petiole 

 short and broad; wings with one submarginal cell, which like the mar- 

 ginal is long and narrow, no discoidal cell Attsi Fal)r. 



Antennal foveae without external carina 2 



2.— Clypeus not interposed between insertion of antenna? :j. 



Clypeus interposed between insertion of antennse; fnnital carina' iilaced in 

 middle of anterior part of the head 4. 



'.i. — Frontal carime placed in middle of anterior part of the head; eyes large, 

 elongate-ovate, occupying a large portion of lateral margin of the head ; 

 antennse inserted clo.se together near anterior margin ; first joint of 

 petiole pedunculate, nodose at tip, second joint globose ; antennje 12 



(or 13?) jointed l*M<>ii«l4»iii.vriiia Guer. 



Frontal carina- i)laced on lateral margin of the head, defining large, elon- 

 gate antennal fovea', the concavity of which is not visible from above; 

 anteiuue (i-jointed Kli'iiiiiiK<Mi,VM Smith. 



4. — Petiole attached to upper basal surface of abdomen, wiiich is cordilbrm, de- 

 ])ressed above, convex beneath, acuminate at ti])-. metathorax rarely 

 unarmed; antenna? 11-jointed: wings witii one complete submarginal 



and one discoidal cell <'r4'iiiaMto$;»»tt('i* Lund 



Petiole attached to the ba.sal middle of abdomen, which is oval i>. 



,1. — First joint of i)etiole nearly cubi(-al ; clypeus short, with two longitudinal 

 crests which are terminated in front l>y two obtuse teeth ; antenna? 12- 

 jointed ; metathorax with two spines posteriorly; wings dark colored, 

 hairy, margins ciliated, one complete submarginal cell, no discoidal, 

 marginal cell short, closed, ajipendiculate .Myriliooiiia < urtis. 



