628 Prof. Mario Bezzi’s Report on a Collection of 
petiolate at the base; the origin of the second vein takes 
place much before the small cross-vein, and the anal cell 
is of equal size throughout its length (whence the name, 
isos and tamevon). 
Face but little projecting ; antennae short, widely separated from 
each other ; the third joint short, the styliform portion terminating 
in a short style, 1} times the length of the whole antenna. Proboscis 
23 times aslong as the head. Eyes with a deep indentation. Mouth 
opening very broad. Legs of the Hxoprosopa type ; claws very 
small; hind claws with a basal tooth. 
Wings very long and narrow, at the base elongately cuneate, anal 
lobe and alula absent; prealar hook small; no basal comb. First 
vein distant from the costa, the costal and subcostal cells therefore 
broad ; second vein strongly bent at the tip; marginal cell broad ; 
three very large submarginal cells; four posterior cells all open, 
anal cell in its middle as broad as at the end, or only a little broader 
at end; discal cell on the middle of the wing, short, not broader 
than the second basal cell ; small cross-vein placed a little after the 
middle of the discal cell ; the vein dividing the third from the fourth 
posterior cell placed towards the middle of the discal cell, which 
there makes a protuding angle ; the third longitudinal vein begins 
ina right angle before the small cross-vein, at a distance from this 
which is two or more times the length of the veinlet. The width of 
the cells on the anterior portion of the wings and the narrowness of 
those on the hind portion are so striking that the third longitudinal 
vein becomes therefore placed a little behind the median axis of the 
wing. 
39. Isotamia daveyi, sp. nov. (Plate L, fig. 7.) 
@. Length of the body 7 mm., of the proboscis 4 mm., of the 
wings 7 mm. 
A black and black-haired species, with pale pubescence on the 
thorax and abdomen, and with the anterior half of the wing 
blackened. 
Frons with sparse, pale tomentum ; hind margin of the eyes with 
a narrow white border; antennae and proboscis black. Thorax and 
scutellum with yellow pubescence ; hind margin of the scutellum 
with whitish tomentum ; the hairs black, but in the middle of the 
front part there are a few yellow hairs ; pleurae covered with strong 
and rough black bristly hairs; metapleural hairs also black. 
Squamulae less distinct ; halteres black. Abdomen black, with yellow 
and white pubescence ; the second segment bears a broad band of 
white tomentum; the hairs on the sides of the first segment are 
