Nicholls and ■Richardson — Two New H penes of Aerotelsa. 135 
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, , The metatJiorax is similar iii shape to the mesotliorax, but 
itfiiai, 
orter, with tyjiieal eonilis of setae. 
The ahdome)} may be described as almost barrel-sliaped, widest 
the region of tlie fourtli se^aneut and tajieriii^ slightly towairds 
tenth. Tlie scales are more aliundaiitly ])resent here than on 
e thorax. The anterior abdominal sternites liave a straight 
-sterior edge, and two combs, of almut ten setae in each, are set 
a slight inclination to the edge in a lateral ])osition (figs. 
, and lb). Tlie tenth tergite, or telson (fig. 2) is elongated and 
arply jiointed, the width being 1.4 times the length; the lateral 
argins are concave outwards, giving it a more ])ointed appearance, 
lis feature serves to distinguish it from the s])Ocies described by 
ilvestri, A. devriesuina and A. devriesiana snb-s]). perspinafa, tho 
argins of which tend to lie slightly convex outwanls. Further, the 
mr paired tufts of setae on the telson are arranged asymmetrically, 
iflio’i} Ivestri figuring in his sjiecies six ])airs of symmetrical combs in the 
le and two similar pairs in the other. 
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Head appendages. The aiitemnae (figs. 9 and 9a), have an eii- 
rged basal joint, the second joint being only slightly larger than 
lose immediately fcdlowing. Kach segment bears two rows of 
‘tae, the ])roximal row circumferential, the other terminal, scales 
Mug present in transverse rows. Towards the a])ex of the antenna, 
mstrictions a])pear at intervals of fi segments, dividing the antenna 
ito zones. 
The Mandibles (fig- 7) are strongly convex, with the cutting 
Ige bearing three distinct teeth on the inner margin, with the 
raracteristic groups of long and short setae. The outer surface is 
■)vered over its proximal half Avith numerous long, stout, jiectinate 
I'tae. Rilvestri makes no reference to the mandible and gives no 
gure of it in the s])ecies he describes. 
The (fig. b) is (diai'aiderised by the length of the ])al]>, 
ut is othenvise typical, having the two terminal segments shortei 
han those preceding it. The setae of the ])alp are simple and 
pirally arranged, and, on the third segment, much more numerous 
han on the tAVo preceding; on the basal segment there is but a 
ingle roAA^, Avhilst the second has two toaa’s. tour stout bifid setat 
,re borne on the basal jmrtion of the maxilla or stipe, proximal to 
he origin of the palp. The galea is pointed, fringed with short, 
imple setae. The lacinia is produced distally into tAvo prominent 
ceth, beloAv Avhich are five cuiAmd plate-like processes; marginally 
here are five stout e<piidistant bristles. 
The labium (fig. 5) is large and Avell defined. The lobes of the 
mb-mentum are produced laterally to giw the appendage a A\idth 
vhich is about tAvice as great as its long axis. The sub-mentiini 
las a. deeply concave postero-lateral edge and bears a single ioaa 
