POLYttHACHIS. 385 



b\ Metanotal spines nearly twice the 



length of the pronotal spines. 

 a. Mesonotum concave ; tibiae with 



spines on the inner margin . . P. mutata, p. 399. 

 b G .- Mesonotum convex ; tibiae with- 

 out spines on the inner margin. P. binghami, p. 399. 

 c'. Pronotuui with a short tooth ; metanotum 

 with a spine on each side; mesonotum 

 unarmed. 



a 2 . Abdomen not depressed, very convex 

 above. 



a 3 . Length 6-7 mm. ; abdomen red P. Uviyata, p. 400. 



b 3 . Length 4-5 mm. ; abdomen black . . P.cey(o)iensis,-p.4W). 

 b' 2 . Abdomen strongly depressed, only very [p. 401. 



slightly convex above " " P. wrougktoni, 



d'. Pronotum with a short tooth on each side ; 



mesonotum and metanotum unarmed . . P. Icevissima, p. 402. 

 b. Thorax more or less flat above, the sides 



margined along their whole length. 

 '. Pronotum, mesonotum and metanotum 



with a spine on each side P. craddocki, p. 403. 



b'. Pronotum with a spine, mesonotum and 

 metanotum with a triangular lamina on 



each side P. horni, p. 403. 



c'. Pronotum with a long spine ; mesonotum 

 unarmed; metanotum with a tooth or 

 tubercle on each side. 



a 2 . Node of pedicel with 2 long spines on 

 upper angles, and two short lateral 

 spines or teeth on sides. 

 a 3 . The lateral spines or teeth truncate or 

 bimucronate at apex. 



a 1 . Pubescence very dense P. proximo, p. 405. 



b 1 . Pubescence sparse P. intermedia, 



ft 3 . The lateral spines or teeth pointed, [p. 405. 



not truncate nor bimucronate at apex. 



a 4 . Pubescence very dense P. inayri, p. 404. 



b*. Pubescence absent or very sparse. 

 a s . Antennal carinae long, divergent 



posteriorly P. striata, p. 405. 



b*. Antenna! carinse short, not diver- 

 gent posteriorly. 

 a. Legs thickly covered with long 



erect hairs P. hanwlata, p. 406. 



b. Legs hairless, smooth P. yerburyi, p. 406. 



6 2 . Node of pedicel armed with 4 short sub- 

 equal spines. [p. 407. 



a 3 . Length 9-10 mm P. stnatorttgosa, 



A 3 . Length 5-6 mm P. convert!, jr. 408. ' 



d 1 . Pronotum with a short spine or tooth ; 

 mesonotum unarmed ; metauotnm with a 

 lamina, spine or tooth on each side. 

 o 2 . Metanotum with backward pointing 

 laminate spines on each side, with the 

 apices curved inwards, shaped like a 

 pair of callipers P. seletu, p. 408. 



TOL. II. 2 c 



