8o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



separated or close together; when close together, dilated 

 to form oblique or horizontal laminae partly covering in- 

 sertions of antennae PonerinjE p. 580 



Pupae naked; abdominal pedicel consisting of two segments 4 

 4. Frontal carinae very close together, almost vertical, not at all 

 covering antennal insertions; eyes always very small or 

 absent; tropical and subtropical DorylinjE 



Frontal carina? of a different conformation and covering the 

 antennal insertions; eyes rarely vestigial or absent; cos- 

 mopolitan MYRMiciNiE p. 581 



PONERIN^. 

 Key to Genera. 



1. Frontal carinae closely approximated; antennae inserted very 



near oral margin; tip of gaster strongly deflected down- 

 ward 2 



Frontal carinas of a different conformation; tip of gaster not 

 deflected downward 3 



2. Front of clypeus projecting in middle; petiole nodiform 



Sysphincta 

 Clypeus not projecting in middle; petiole surmounted by a 

 sea le Proceratium 



3. Mandibles linear, inserted close together at middle of oral 



border; petiole terminating in a point or spine above 



Odontomachus 

 Mandibles inserted at corners of head; petiole rounded or 

 flattened above 4 



4. Antennae very thick and robust 



Antennae not greatly thickened 



5. Pygidium with a row of prominent prickles on its lateral 



border; last antennal joint not greatly enlarged 



Acanthostichus 

 Pygidium without prominent prickles on its lateral border; 

 last antennal joint greatly enlarged Cerapachys 



6. Mandibles long and slender, with coarse, bidenticulate teeth; 



clypeus with numerous teeth on its anterior border; peti- 

 ole not constricted posteriorly Stigmatomma p. 581 



Of a different conformation 7 



7. Claws pectinate 



Claws simple 9 



8. Mandibles edentate, slender; without distinct apical border 



Leptogenys (s. str.) 

 Mandibles broader, generally toothed; with distinct apical 

 border Leptogenys (Lobopelta) 



9. Median spur of mid and hind legs alone developed; lateral 



spurs lacking; small species with vestigial eyes..Ponera p. 581 



