96 rehire RR: E. Tubaat on : 
truncation not sharply divided from the dorsal surface. Ab- 
domen shining, very finely coriaceous, with scattered punc- 
tures ; the apical segment densely clothed with coarse golden. 
hairs. The transverse groove near the base of the second 
sternite is almost straight. Hind tibie strongly serrate. 
Second abscissa of the radius longer than the third, the first 
and fourth about equal. First recurrent nervure received at 
about four-fifths from the base of the second cubital cell, 
second distinctly before the middle of the third cubital cell. 
Cubitus of the hind wing originating distinctly beyond the 
transverse median nervure. 
$. Clypeus narrower than in the female, the eyes con- 
verging below,,not parallel as in the female. Hind tibize 
spined, not serrate. Seventh tergite broadly subtruncate at 
the apex. 
Hab. Vien Than, May and June 1915; also from Mergui 
and Middle Tenasserim (Bingham). 
This is the species figured by Bingham (Journ. Bombay 
Nat. Hist. Soc. 1895) as Sphex flava of Fabricius; but it 
does not correspond to the description, several of the apical 
seoments being fulvous in this species, only one in flava. I 
feel confident that Dahlbom was right in his identification of 
flava after consulting the Fabrician collection. Probably the 
type was in that collection, as Fabricius makes no statement 
to the contrary. But Fabricius evidently had a very coufused 
idea of his own species, as a specimen identified by him as. 
flava in the Banksian collection is a female with bifid tarsal 
ungues, and from his description of a variety in Ent. Syst. I 
suspect that he has also confused Batozonus unifasctatus, Sm., 
with flava. Bingham, in ‘ Fauna of British India’ (4897); 
after examining the specimen labelled flava in the Banksian 
Collection, still regarded this species as an extreme variety of 
ava. But he cannot have noticed the tarsal ungues. In 
the same work Bingham rightly sinks Priocnemis humberti- 
anus, Sauss., as a synonym of flava, though it is undoubtedly 
distinct from the specimen in the Banksian Collection.. As- 
the matter stands, I consider we have three species which 
have been eonfused by Bingham under flava :— 
1, Cryptochilus flavus, Fabr. 
Sphex flava, Fabr. Syst. Ent. p. 852 (1775). 
Priocnemis flavus, Dahlb. Hym. Europ. i. p. 457 (1845). 
Priocnemis humbertianus, Sauss. Reise de Novara, Zool. ii. p. 63 (1867). 
2d. 
In this species the tarsal ungues are unidentate in both 
SEXES. 
