- 
366 Prof. Westwood’s Descriptions of 
Dapanoptera plenipennis. (Pl. XVIL., fig. 2). 
Walker, l. c. supra (Limnolia plenipennis.) 
The fore wing of this very remarkable species is 
represented from a specimen from New Guinea, which 
I purchased and which is now in the Hopeian Collection. 
It has unfortunately the antenne broken; the thorax is 
anteriorly very gibbose; the head small and affixed very 
low; the tibiz have a very short slender spine at the 
extremity ; the tarsi are destitute of an empodium ; the 
extremity of the body is furnished with two rounded 
lobes and two recurved acute bifid horny spines. 
The singularly irregular posterior margin of the wing 
is unique among dipterous insects, and it is strange that 
Mr. Walker should not have recorded it. His description 
of D. plenipennis is as follows :— 
Male. Chestnut-colour, shining. Head, palpi, and 
antenne, black. Thorax attenuated in front; pectus 
testaceous in front. Abdomen short, dull ochraceous, 
black towards the tip, very little longer than the thorax. 
Legs brown, long, slender; coxe and femora testaceous, 
the latter with brown tips. Wings cinereous; basal and 
subapical parts pale luteous; three irregular blackish 
stripes; first stripe costal terminated by a white trans- 
versely-elongated blackish-bordered spot; second in- 
cluding two elongated white spots and two white points, 
beyond which there are two white blackish-bordered 
dots; third paler and diffuse, including one elongated 
white spot; a discal areolet, radial vein not forked; 
first externo-medial vein not forked; no second externo- 
medial vein; third externo-medial vein forked; one 
veinlet between the third externo-medial vein and the 
subanal vein, nearer than the discal areolet to the base 
of the wing; halteres testaceous, with white knobs. 
Length of the body 5 lines; of the wings 14 lines. 
SIGMATOMERA. 
Osten-Sacken, Monogr. of N. Amer. Dipt., vol. iv. 
j opel Sy it 
Sigmatomera Amazonica, n.s. (Pl. XVIL., fig. 3). 
Capite obscure fulvo, oculis magnis fere in medio 
faciel conjunctis; palpis brevibus lutescentibus; an- 
tennis nigris 15-articulatis, thorace plus duplo longi- 
