146 
is only a gutter. The bottom of the upper tube is formed by the 
labrum in the middle and at the sides by the inwardly directed 
parts of the maxillae coalesced with the latter; this bottom is almost 
flat behind, but in front it is strongly keeled (pl. IV fig. 5 ? and 
VI fig. 5 5). 
b. Labrum. The labrum consists of two pieces as in the 
Phalangiidae. The distal one (pl. IV fig. 6 2) is elongated and more 
narrow in front, where it is. teethed (pl. IV fig. 8 7), and projects 
over the mouth. This free part is bent a little downwards (fig. 4 2). 
The distal piece is broadest just in front of the hindmost margin; 
the outer margins are slightly bent outwards. The proximal piece 
is much shorter; in front it is much narrower than the hindmost 
part of the distal piece, the margins are first slightly curved out- 
wards, and after a slight bend they are directed obliquely outwards, 
so that the hindmost straight margin is as broad as the broadest 
part of the distal piece, and as broad as the proximal piece is long. 
c.: Maxzillae (pl. IV fig. 4-& 5). As mentioned above the 
maxillae are coalesced along the middle line below; on each side 
they are provided with a large projection directed obliquely upwards 
and backwards (fig. 4 6), the free end of which is divided into a 
short front branch and a longer hindmost one; the hindmost margin 
is articulated to the head, and the base is united with the ,,rostrum”. 
Just in front of this projection the trochanter of the palps is arti- 
culated in a deep cavity. The ventral side of the fused maxillae 
is flat or slightly convex from one side to the other; distally it is 
bent slightly upwards. From the base to the tip a chitinous tube 
(pl. VI fig. 6 tu) is placed just under the skin, in front debouching 
between two Zateral lobes just beneath the labrum. Near. the tip 
there are placed two hairs in the middle; more outwards and behind 
four other longer or shorter hairs on each side. The end of each 
lateral lobe is directed inwards, so that the chitinous tube which 
is placed between them seems to be enlarged near its deboueb. 
Each lobe is a little more elevated than the preceding part of the 
ventral side and is prolonged upwards to coalesce with the labrum, 
