FOSSIL TIPULIDA) FROM THE OLIGOCENE OF ISLE OF WIGHT. 111 
veins. Second simple, angulated at a little less than a third of its 
length, where it is joined to the end of Rf, by a long, oblique cross- 
-vein, directed backward; terminal part of second straight, third 
before discal cross-vein strongly curved, its course beyond nearly 
straight, reaching tip of wing. Discal cell deep, six-sided, but its face 
on second basal very short; its apex emits three simple veins, the 
second a little nearer the first than the third. The base of the second 
and third posterior cells distinctly concave; second basal cell 
extendinga little beyond corner of discal, its apical face oblique; sixth 
vein ending far from fifth, seventh (axillary) strongly curved down- 
wards at end. Genitalia shown in figures. 
British Museum, I 9946. Resembles D. pudica, O.S., but 
second basal cell as in D. pubipennis, O.S. 
Gonomyia indecisa, n. sp. 
Wing slightly over 6 mm, long. 1:7 mm. broad, hyaline, not 
reddened, with very pale yellowish veins ; humeral cross-vein distinct. 
Costal vein deeper than usual, A, ending acutely on margin a short 
distance before forking of prefurca, auxiliary apparently absent. 
Prefurea strongly arched, originating about middle of wing, curving 
downwards to make a very broad marginal cell. The second vein 
forked, forming a widely open submarginal cell, the upper side of 
which is about twice as long as the stem and the dower side about 
twice as long as the upper; third vein (f, + ;) nearly straight, 
ending very slightly above the tip of the wing. Discal cell elongate 
and five-sided, emitting three simple veins from its apex, but the 
vein separating the third posterior cell from the discal is extremely 
weak and hardly visible, so that, without close scrutiny, the discal 
appears not to be closed ; the second posterior has an angular base 
much shorter than the base of the third; second basal cell equal in 
length with the first, its apex scarcely beyond base of discal. Sixth 
vein widely separate at apex from fifth; seventh a little curved, 
entering margin a little before origin of preefurca. 
British Museum, I 9087 (Brodie Collection). Rather like 
G. afinis, Brun., but Rh, very much shorter, second basal larger, 
and discal cross-vein not approaching fork of prefurea. Differs 
from the other Gurnet Bay fossil species by the closed (though 
indistinctly) discal, but especially by the much shorter R,. 
Macromastix cladoptera, n. sp. 
Wing 9:3 mm. long, 2:5 mm. wide, narrowing to a petiole basally, 
without any anal lobe, as in Dolichopeza ; wing hyaline, apparently 
darkened along the fifth vein and the veinlets of the apical field, but 
there is a diffused iron stain on the fossil, which makes the true 
coloration doubtful. Apex very obtuse. Auxiliary vein not clearly 
visible, apparently entering Ff, near base; F, terminating a little over 
2 mm. from tip of wing. Prafurca remarkably short, arising 3:5 mm. 
from tip of wing, forming a very acute angle, giving off the third 
(R, + ;) before middle of first marginal cell. Second vein (/?, + 3) 
