138 Nicholas and Kichakdson — 7’?ro New Species of Aerotelsa. 
those occuvriiig on the ninth are ahnornmlly elongate and slender. 
The posterior margin of tlic sternal ])lates is slightly concave, with 
c( mhs consisting of about sixteen setae set at each side of the 
concavity. The tentli tergite is almost e<|uilateial and less pointed 
than that of A. spleiuleiis a.Uil Avitli the lateral mai'gins eremite. 
Tliere are three conspicuous symmetrical groiqis of setae on the 
telson and tlie numl.)er of bristles in each does not exceed three. 
The margin is set with fine setae, giving it a senate appearance. 
Head appendages, — The antennae differ little from those of .-1. 
spicndens. except in the distinctly deep reddish broAvn colouring, 
zoning by constrictions ajipears at intervals of five segments (fig. 
19). 
The 2Jandibles (fig. 17} are shorter and slightly more convex, 
and Avith the first marginal tooth shorter than those following it. 
Setae are found in the characteristic positions. 
Maxilla (fig. 15) : There is a short stout maxillary palp, the 
terminal segments of Avhich are shorter than those near the base. 
The sjiiral arrangement of the setae is less marked and they are 
more evenly distributed on the various segments. There are three 
stout, bifid setae on the stipe posterior to the base of the palp. The 
galea is blunt and irregular, whilst the lacinia is slender and rather 
acute. 
Labium (fig. 16) the sulnmentum approaches a rectangular 
shape Avith the lateral lobes blunt cornere<l, and giving the labium 
a breadth of about tAvice the length of the long axis. The posterior 
margin of the sub-mentum has an angular concavity similar in shape 
to that occurring on the posterior border of the niesothorax. The 
mentum is distinctly reduceil and divided into tAvo lateral portions. 
It carries the typical roAV of stout, bifid setae- The stout palps 
liave the terminal segment slightly elongate and the sensory papillae 
at their apex feAA’er than in A. splendens and arranged in a circular 
group. 
Thoracic appendages.- — The legs (lig. 14) are distinctly stout, 
with the coxa, femur and trochanter very strongly developed. The 
pectinate setae on these segments are long and coarse, and the serra- 
tions are confined to the afiical region. The tibial spur is ter- 
minated in a hook. Asymmetry occurs in the chnvs, the outer one 
being strongly curved and the inner one strong and comparati\'ely 
straight. The pulvillus is large and conspicuous on the second and 
Uiiid legs (figs. 14a, 14b). The mesothoracic sternite (fig- 18a) 
is larger than that of the metathorax and both huA’o similarly ar- 
ranged combs on the jiosterior margins. 
A reduction occurs in the abdominal styles (fig. 12) of the 
eighth sternite, Avhilst an elongation is noticealile in those on the 
