96 GENERA OF HYMENOPTERA. 



2. — Antennie inserted as near, or even nearer, to middle of frontal carinse than 

 to their anterior extremity, and distant from posterior edge of clypeus; 

 clypeal fovete separated from antennal fovese ; frontal area indistinctly 

 defined, much broader than long ; scale thick ; wings without discoidal 



cell 3. 



Antennae inserted toward anterior extremity of frontal carina;, at or very 

 near posterior edge of clypeus; wings with or without discoidal cell. ..4. 

 3. — Clypeus trai)ezoidal, its lateral margin diverging in front where they reach 

 the lateral angles of the head ; antenna; long, with fii-st joint of funicle 

 scarcely larger than the second ; froutsil carime sinuate, scarcely diver- 

 gent C'amponotnii Mayr. 



Clypeus almost square, only slightly broader at the arterior angles, which 

 do not reach lateral margin of the head; antenme short, first joint of 

 funicle thickened at apex, twice as long and as thick as the following 

 joints; frontal carinre sinuous, strongly diverging behind. 



Colobopsis Mayr. 

 4. — Antennae 10-jointed; mandibles not dentate, acute at tip ; uie.sothorax gib- 

 bous, prolonged anteriorly ; scale of j>etiole small : external genital 

 valves triangular, broad, short, rounded at tip- wings without complete 



submarginal cells Brachyiuyriiiex Mayr. 



Antenna; 13-jointed 5. 



'y. — Clyi)eal fovea; not united to antennal fovea;; antenna; inserted very near 

 the clypeus, but not touching its posterior margin ; scale thick ; mandi- 

 bles not toothed ; external genital valves very narrow. 



Preiiolepis Mayr. 

 Clypeal fovea; united to antennal fovea; ; antennae inserted on posterior 



margin of clyi>eus 6. 



tJ.— Mandibles broad, flat, with apical margin dentate or simple ; anterior mar- 

 gin of clyi)eus convex, prolonged 7. 



Mandibles cylindrical, short, narrow, acute at tip, without apical margin 

 and without teeth; clypeus triangular, rounded at hase. convex, its an- 

 terior margin straight and not prolonged : scale vertical, thick, quad- 

 rangular, cmargiiiate above: wings with one discoidal cell. 



Polyergu!^ Latr. 

 7. —Frontal area indistinct; external genital organs very small; tirst joint of 

 funicle thicker than second ; size small, much inferior to that of J • 



Lasitis Fabr. 

 Frontal area sharply defined ; external genital organs large; tirst joint of 

 funicle usually not thicker than second ; size large, very little less than 

 that of ?. 

 Abdomen rather depressed above; wings extending beyond apex of abdo- 

 men; discoidal cell large, rarely wanting; first joint of funicle one- 

 third shorter than second ; thorax slightly enlarged laterally at middle ; 



prothorax somewhat transversely convex Formica Linn. 



Abdomen cylindrical, not depressed; wings short, not exceeding the ab- 

 domen ; discoidal cell small or wanting ; first joint of funicle as long 

 as second ; thorax compressed laterally and of a moderately uniform 

 size; prothorax slightly comave, transverse medially. 



niyrniecooystus Wesm. 



