1868.1 273 
but its rccoguitiou seems to be due to the English writers, as no Ger- 
man autlior refers to it. The antenna of the (^ is iigured by Curtis, 
B. E., 688, with Bhodites (Cynips) nervosus. 
Genus Aulax, Hartig. 
Antennoo of the ^ 15— IG-jointed, not longer than the body, 3rd 
joint not emargiuate, not longer than the 4th ; the rest equal, not ta- 
pering towards the apex ; of the ? 13— i4-jointed, shorter than the 
body. Maxillary palpi 5-, labial palpi 3-articulato. Mesothorax gla- 
brous, coriaceous, or sub-rugulose, gibbous ; the longitudinal sutures 
often obsolete in front. Scutellum short, semi-orbicular. Petiole 
rugose, not striolated as in Synergus, consisting of one piece only. Ab- 
domen sub-globose, not compressed ; the 2nd segment concealing nearly 
all the rest. Wings with the radial cell short, broad, sometimes im- 
perfectly closed ; the areolet placed nearer to its middle than to its 
base. 
Aylax, Hart., in Germ. Zeits., 2, 195 ; Aulax, ibid. 3, 343 ; 
Tasch. Hym. 122. 
Aulax, Osten-Sacken, Proc. Ent. Soc. Phil., Vol. iv. 
The few specimens of this genus that I have before me (including 
some German individuals of Mr. "Walker's collection, named by Porster), 
are in so bad a state as to render any conclusions formed from them 
rather doubtful. The characters of the genus are, however, nearly the 
same as those of Synergus, except the structure of the petiole. In 
Synergus this consists of two cylindrical pieces, the first fitting into the 
second and larger one, which is conical, having the small end behind. 
As at present constituted, Aulax forms a transitional group, connecting 
the Psenides, or true gall-makers, with the Inquilini, or those which 
" lodge " at the expense and in the habitations of the former. The 
habits of the species are alternately those of either class. They are 
classified by Hartig according to the superficial texture of the meso- 
thorax. 
i. Disc of the mesothorax aciculated, almost rugulose. 
Aulax sahaudi, Hart. 
Black ; antennae dusky red, darker at the apex, joints 1 — 3 blackish ; 
of the cJ 15-, of the ? 14!-jointed. Abdomen and legs ferruginous, 
the former blackish above, the latter with the coxae, trochanters, and 
base of the femora, black. Anterior coxae of the ? more or less red- 
dish. Mesothoracic sutures obsolete, except near the scutellum ; the 
latter aciculated like the thorax. Areolet sub-obsolete, its lower veiu 
nearly obliterated. ^ $ . Long. % — 1 ; alar. exp. 2 lin. 
