STUDIES m THE FOSSORIAL WASPS. 715 



belong to the genus Isioara Westw., which also belongs to the 

 Elidinas. 



Elis (Mesa) dimidiata Guer. 



Myzine dimidiata Guer. Diet. pitt. hist. nat. v. p. 584 (1837), 



6. 



Metkoca orientalis Sm. Cat. Hym. B. M. iii. p. 66 (1855), c5" 

 (nee Smith, 1875). 



Myzine inadraspatana Sm. Cat. Hym. B. M. iii. p. 72(1855), $ . 



Myzine violaceipennis Cam. Mem. Manche,5ter Lit. & Phil. Soc. 

 xlii. p. 21 (1898), ? . 



Hah. The whole of India, except the ISTorth-West. 



5 . Head and thorax coarsely rugosely punctured, smooth 

 round the anterior ocellus and at the base of the mesonotum ; 

 median segment opaque, with a narrqw median sulcus in which is 

 a low carina, the sides of the sulcus ^-p,ised and forming low 

 carinse, the segment not margined at the base of the posterior 

 truncation. Radial cell distinctly separated from the costa for 

 more than half its length, third abscissa of the radius very 

 distinctly longer than the second. Sixth dorsal segment finely 

 longitudinally striated ; basal joint of hind tarsi with a scopa of 

 short hairs beneath. 



Black ; second, third, and the base of the fourth abdominal 

 segments ferruginous. Oalcaria whitish ; wings fusco- violaceous. 



S . Head and thorax closely punctured ; median segment 

 rugose ; basal third of first abdominal segment forming a narrow 

 petiole, apical two-thirds swollen and slightly constricted at the 

 apex, the whole segment more than half as long again as the 

 second segment. Abdomen shining, veiy finely punctured ; 

 pygidial area coarsely punctured, fully twice as long as bj'oad, 

 the sides raised and forming carinse, a well-definpd median carina, 

 the apex narrowly truncate, not emarginate. 



Black ; the abdomen slightly glossed with blue ; base of the 

 mandibles, foi-e tibiso in fiont, fore tarsi in front, base of the 

 tegulsB and the hind margin of the pronotum narrowly and 

 obscurely pale yellow. Wings hyaline at the base, fuscorhyaline 

 beyond the basal nervure. 



Length 17 mm, 



The association of the sexes was suggested by me in 1908, and 

 positive proof was published by Mr. Lefroy a year later, a pair 

 having been taken in coitu by Mr. Dutt at Pusa. 



Elis (Mesa) mandibularis Sm, 



Methoca mandihidaris Sm. Trans. Ent. Soc. London, p. 301 

 (1869),_J. 



Plesia {Mesa) ^nandibidaris Turn. Ann. & Mag. Nat. Hist. (8) 

 i. p. 509 (1908), S . ■ 



Plesia (Mesa) pitt-pureipennis Turn. Ann. & Mag, Nat. Hist. 

 (8)i. p. 508(1908), $. 



This will almost certainly prove to be the Chinese subspecies 



47* 



