170 Mr, R. M‘Lachlan on the 
basal half; inner marginal area almost without transverse 
nervules ; costal area at the apex with two rows of large 
irregular cellules. Posterior wings nearly orbicular ; costal 
marein strongly arcuate and without any projection. 
(2 subimago.) Head and thorax dull greyish-fuscous ; 
abdomen blackish-fuscous, darker at the sutures. Legs 
dull pale-yellowish. Tails black. Wings smoky-grey, 
with black veins; the anterior pair with the costal mar om 
broadly ferruginous. 
Expanse 27 mm. Length of anterior wing 14 mm., 
of posterior 33 mm. 
Yokohama ( Pryer). 
In the absence of the 4 the most striking character of 
this species is the broad ferruginous costal margin of the 
anterior wings of the sub-imago. 
DIPTEROMIMUS, gen. nov. 
$. Eyes very large, but probably simple. Abdomen 
long and slender; last ventral segment completely sepa- 
rated laterally from the dorsal, forming a sub-quadrate 
plate bearing the forceps, which are four-jointed; penis 
long and slender; two tails. Anterior legs very slender. 
Anterior wings long and very narrow, especially at the 
base; transverse veinlets numerous and disposed over all 
the wing; no rudimentary marginal veinlets. Posterior 
wings very minute, narrow, the costal margin simple. 
Although the insect upon which this genus is founded 
is old and much mutilated, it differs so much from all 
described genera that I have not hesitated to form a new 
one for it. It bears a striking resemblance to a small 
Tipula, and should probably he placed near Stiphlurus 
and Hexagenia. 
D. tipuliformis, sp. nov. 
$ imago. Fuscous, with a testaceous tinge above, 
pale yellow beneath; head black between the ocelli; hinder 
lobes of meso- and meta-nota yellow. Legs (all but the 
anterior mutilated) testaceous. Wings vitreous, with 
brown veins. Tails blackish? (only basal joints present). 
Last dorsal segment of abdomen rounded on its margin ; 
the ventral seoment supporting the forceps very large, 
broadly and triangularly excised in front; basal jomt of 
forceps very short, 2nd long and curved; 3rd and 4th very 
short, the 4th somewhat shorter than the 3rd; ; penis long 
and slender, curved upward, furcate at the apex. 
