POLYUIIACUTS. 385 



b'\ Metanotal spines nearly twice the 

 length of the prontjtal spines. 

 a'\ Mesonotiim concave ; tibitewith 



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

 b". Mesonotnm convex ; tibiae with- 



out spines on the inner marg-in. P. binf/hami, p. 399. 

 c'. Pronotuiu with a short tooth ; metauotum 

 with a spine on each side; mesonotuni 

 unarmed. 

 a-. Abdomen not depressed, very convex 

 above. 

 a\ Length 6-7 mm. ; abdomen red .... P. levigata, p. 400. 

 6\ Length 4—5 mm. ; abdomen black .. P.cei/h»iensis.-pAOO. 

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



slightly convex above P. wroKf/htoni, 



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



mesonotnm and metanotum nnarmed . . P. Icsvis^itna, p. 402. 

 b. Thorax more or less tiat above, the sides 

 margined along their whole length. 

 a'. Pronotum, mesonotuni and metanotnm 



with a spine on each side P. a-addocki, p. 403. 



b'. Pronotum with a spine, mesonotuni and 

 metanotum with a triangular lamina on 



each side -P- horni, p. 403. 



c'. Pronotum with a long spine ; mesonotuni 

 unarmed ; metanotum with a tooth or 

 tubercle on each side. 

 «■-. Node oi" pedicel with 2 long spines on 

 upper angles, and two short lateral 

 spines or teeth on sides. 

 fl^. The lateral spines or teeth truncate or 

 bimucrouate at apex. 



(iK Pubescence very dense P. jiroxima, p. 40o. 



/>\ Pubescence sparse P. intei-media, 



h\ The lateral spines or teeth pointed, [p. 405. 



not truncate nor bimucronate at apex. 



a^. Pubescence very dense P. mayri, p. 404. 



h^. Pubescence absent or very sparse. 

 «'. Antennal carina long, divergent 



posteriorly P- striata, p. 405. 



b'\ Antennal carinae short, not diver- 

 gent posteriorly, 

 a". Legs thickh" covered with long 



erect hairs P. hamtdata, p. 406. 



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



b-. Node of pedicel armed with 4 short sub- 

 equal spines. [p. 407. 



a^. Length 9-10 mm P. .ttriatorugosa, ; ^ 



6'. Length 5-6 mm P. convc.va, p. 408. 



d'. Pronotum with a short spine or tooth ; 



mesonotum unarmed : metanotum with a 



lamina, spine or tooth on each side. 



a^. Metanotum with backward pointing 



laminate .spines on each side, with tlie 



apices curved inwards, shaped like a 



pair of callipers /'. s^elene, p. 408. 



■^OL. II. 2 



