394 vESPiD.i;. 



b'. Smaller. 2 . Length 19--20 nmi. ? . 

 Length 17-19 mm. Head, thorax, 

 and abdomen chestnut-brown, the 

 greater part of the thorax ^ ariegated 

 with black P. sulcatm, p. 395. 



b. Abdomen with the 2nd segment orange- 



yellow on the apical two-thirds or half. 

 a'. Thorax very coarsely rugose. $ . 



Length 2.3 mm F. hoplites, p. 395. 



b'. Thorax not so coarsely rugose. $ . 



Length 16-18 mm P. sagiUarius, p. 395. 



c. Abdomen with the apical and lateral mar- 



gins of the 1st and apical margins broadly 



of the 3rd and 4th segments yellow .... P. di(jma, p. 396. 



d. Abdomen with the apical margins of seg- 



ments 1-5 somewhat narrowly yellow. . P. maculipetmis, p. 396. 



e. Abdomen with the apical margins of seg- 



ments 2-5 with broad anteriorly arched 



subluuate marks P. assamensis, p. 397. 



/. Abdomen with the apical margins of seg- 

 ments 1-5 dark red P. adustus, p. 397. 



B. Mesonotum with two yellow parallel lines, 

 2nd abdominal segment with a bisinuate 

 black line across the middle always 

 present P hehrceus, p. 398. 



686. Polistes schach. 



Vespa schach, Fahr. Spec. Ins. i, p. 461. 



Polistes schach, Fabr. Syst. Fiez. p. 270 ; Sauss. 3Iu7i. Giu-p. Soc. 



p. 50 ; Smit/i, Cat. v, p. 105. 

 Cyclostoma orientalis, Kirbi/ 3,-Spence,Introd. Ent. iii, p. 633 (ed. i.). 

 Polistes orientaHs, Lep. Hym. i, p. 519; Smith, Cat. v, p. 102. 

 Polistes gyrostoma, Sauss. Mon. Guep. Soc. p. 104. 

 Polistes confusus, Sinith, Cat. v. p. 102. 



2 ^ . Head and thorax closely and somewhat coarsely punctured, 

 the punctures on the proiiotum runuiug into transverse stria3 ; 

 abdomen smooth, dull and opaque ; the mediau segment Avith a 

 broad shallow furrow near the apex, transversely striate, the striae 

 coarse and somewhat prominent. Entirely of a dull chestnut- 

 brown, shaded with fuscous on the thorax above and on the bases 

 of the abdominal segments ; wings browu, subhyaline, with in some 

 specimens a purplish effulgence. 



(5 similar ; the eyes very smaU, separated from the base of the 

 mandibles by more than two-thirds of their own length ; the 

 mandibles very large, arched, the apex with two strong teeth ; the 

 clvpeus nearly square, very obtusely angled in the middle ante- 

 riorly ; the head and thorax more sparsely punctured than in the 

 2 or 5 ; the apical joint of the flagellum of the antenna3 flattened, 

 cornute. 



So far as size is concerned this species varies a good deal, but it 

 seems pretty constant in coloration. 



