MYRMECOSEPSIS. v 
245 
at the base and only a little shorter than the head is broad (20 : 25). Pro¬ 
boscis short, palpi stick-like. 
Of the head-bristles there is only one vertical bristle well developed, 
this being very long and bent forwards. On the sides of the frontal triangle 
six pair of tiny bristles bent inwards. On the sides of the frons near the 
edge of the eyes a row of nine tiny bristles bent backwards, on the lower 
part above the antennæ several longer ones are to be seen the innermost 
ones of which are crossed. 
Thorax a little longer than the head, convex on the disc covered 
with quills and very fine pubescence. The sutures very conspicuous. Pleuræ 
bare. Scutellum oblong, vesiculate, elevated a little upwards and covered 
with quills. 
Abdomen longer than the thorax, bottle-shaped, contracted at the 
base, the tergites, except the two basal ones, covered with quills which 
are shorter and weaker than those on the thorax 
and scutellum, and become bristles towards the 
sides. The segments completely blended together 
only the borders of the first and second tergites 
are to be seen as furrows. First tergite rather 
smooth (some specimen have it wrinkled at the pig 2 Wing of Myrme . 
sides), the second finely wrinkled longitudinally, cosepsis hystrix n. g., n. sp. 
the others (or perhaps there is only one there, cT enlarged two hundredfold, 
the third) smooth, and polished. The sharp edge 
of the abdomen shows a fine serration visible when magnified tenfold. The 
sternites are formed by a fine membrane shutting off the belly like a plate, 
or, if dried up, joining the underside of the tergites when the belly appears 
to be hollow. The genitalia I could not examine, and can only say that 
the hypopygium of the male is ball-like, and in the female there are two 
small lobes to be seen. 
Legs rather slender and long, without conspicuous bristles or hairs. 
At the tip of the middle tibiæ underneath there is a spur. Claws curved, 
pulvilli present. 
Wings present, but extremely reduced, membranaceous, they appear 
like little white rudiments. When magnified two hundredfold they appear 
as in fig. 2, from which we can judge nothing at all of the venation. Hal¬ 
teres present. 
Myrmecosepsis hystrix n. sp. $ . 
Brownish-yellow to brown, rather dull, only the large last abdominal 
segment (or coalescent segments) blackish-brown, shining. Arista dark 
brown; in mature specimens all the tarsi of the fore legs and the two last 
