or THE ISLAND OF ST. TINCENT. 217 



Mesonotum without furrows. 



Mandibles 2-dentate ; segments 1 and 2 

 equal in length, the 3rd longer {Opis- 

 thacantha). 

 Mandibles 3-dentate ; segments 2 and 3 



equal in length, the 1st shorter Lapitha, Ashm. 



Metascutellum not spined, simple. 



Marginal vein short, or not more than 

 half the length of the stigmal, most 

 frequently punctiform. 

 Mesonotum without furrows. 



Head quadrate Cacus, Riley. 



Mesonotum with two furrows. 



Antennae with a 6-jointed club Anteris, Forster. 



Antennae filiform, without a club Apegus, Forster. 



.3. Mesonotum with three distinct furrows. 



Metascutellum with two erect teeth Hoploteleia, Ashm. 



Mesonotum with two furrows. 



Abdomen very long, fusiform or linear. 

 Metathorax unarmed ; mandibles 3-den- 

 tate Macroteleia, Westw. 



Abdomen not very long, ovate or oblong- 

 oval. 

 Metathorax unarmed ; mandibles 2-den- 

 tate Anteris, Forster. 



Mesonotum without furrows. 

 Metascutellum spined (Opisthacantha) . 

 Metascutellum simple. 

 Abdomen fusiform. 



Abdominal segments strongly constricted; 



antennal club oval, 5-jointed Cremastohcsus, Aslim. 



Abdomen broadly oval, sessile, the second 



segment usually a little the largest .... Hadronotus, Forster. 

 4. Submarginal vein not reaching the costa, 



knobbed Bceoneura, Forster 



[ Submarginal vein reaching the costa often by a 

 thickened stigma. 

 Marginal vein very short, the postmarginal 

 scarcely developed, or shorter than the 

 stigmal. 



Mesonotum with two furrows Idris Forster. 



Submarginal vein terminating in a thickened 

 stigma. 

 Head without a frontal lamma or ledge ; post- 

 marginal vein never developed ........ 5. 



LHW. JOUEN. — ZOOLOGY, VOL. XXV. 16 



