38 
[April 
Diastrophus nebulosus. 
9 antennee, 13 jointed, last joint as 
long as the two preceding taken to¬ 
gether, etc. 
antennae 14-jointed,' 1st joint longer, 
last joint shorter than in A. sylvestris. 
Prothorax (collare) and humeri acicu- 
lated. 
Thorax smooth and very shining above, 
without any vestige of a sculpture, 
except the usual furrows. 
Interval between the anterior ends of 
the parapsidal grooves (near the pro¬ 
thorax) smooth ; the two short, inter¬ 
mediate grooves usually apparent 
there, are hardly perceptible, 
abdomen oval, more or less attenu¬ 
ated and pointed ( not truncate ) 
behind; it is compressed from above 
that is, its' vertical diameter is longer 
than, or at least equal to, its trans¬ 
verse diameter. 
9 abdomen in structure, like that of 
' the ^ (with the usual sexual differ¬ 
ences) ; that is, the second and third 
segments of the abdomen do not dif¬ 
fer considerably in length. 
Sheath of the ovipositor concealed. 
Wings. Subcostal, first and second 
transverse veins much stouter than 
the others and clouded with brown. 
Second transverse vein slightly arched 
and shorter than in A. sylvestris. 
Aulax sylvestris. 
9 antennse, 12-jointed, last joint longer 
than the two preceding taken toge¬ 
ther, subcylindrical, showing a sub¬ 
division in three joints. 
% antennae, 14-jointed; first joint shor¬ 
ter, last joint longer than in D.nebu- 
losus. 
Prothorax and humeri indistinctly 
punctured and finely downy. 
Dorsum of the thorax appearing mi¬ 
nutely punctured under a strong 
magnifying power, and therefore 
somewhat less shining than in D. 
nebulosus. 
Interval between the anterior ends of 
the parapsidal grooves with some 
distinct punctures; the two short, 
intermediate grooves are apparent. 
abdomen bell or funnel-shaped, trun¬ 
cate behind; it is compressed frmn 
the sides, that is, its transverse dia¬ 
meter, at the broadest place is shorter 
than its vertical diameter. 
9 abdomen very different in structure 
from that of the male, as the second 
segment occupies almost its whole 
’surface, the following ones being 
either concealed under it or protrud¬ 
ing but little beyond it; the abdomen 
is strongly compressed from the 
sides, that is, its vertical diameter is 
much longer than the transverse 
one; seen from above, the abdomen/ 
appears somewhat bell-shaped in 
outline, being oval and truncated at 
top. 
Sheath of the ovipositor directed up¬ 
wards and protruding distinctly. 
Subcostal, etc., not, or very slightly, 
stouter than the radial vein, not 
clouded with brown. 
Second transverse vein straight and 
longer than in D. nebulosus. 
