THE MOUTH-PARTS OF PANGONIA LONGIROSTRIS. 259 



which lies internal to, and further back than, the articulation of the mandible ; it 

 is spindle-shaped, "74 mm. long, and has a strongly chitinised ridge running down 

 its length. 



The stipes cannot be distinctly separated off from the galea. It articulates with 

 the distal end of the cardo, and from here to the base of the palp it is strongly 

 concave outwards, but then curves in the opposite direction and merges into the 

 galea 



The lacinia is a curved projection from the base of the inner edge of the galea ; 

 it has a pointed end directed towards the base of the head. 



The galea is a long narrow chitinous rod, of the same length but not as broad as 

 the mandible, the greatest width being "35-37 mm. Its basal portion is evenly 

 chitinised throughout its breadth, but more distally the chitin is concentrated into a 

 narrow darker band, which runs to the apex. The latter is rounded and covered with 

 numerous rows of teeth, which point backwards (text-fig. 4). The teeth are deep 

 basally, but are produced into thin flattened or pointed ends. On the outer edge of 

 the galea the teeth continue only for a short distance, hairs arising part of the way 

 down and then continuing down towards the base beyond the point where the teeth 

 disappear. Teeth are found on the inner edge to a point further down than the 



Fig. 4. Apex of left maxilla (galea) of $ ; 

 greatly enlarged. 



outer edge, but they gradually become less numerous and then are no longer 

 evident. Some of the more distal of these teeth point inwards. Following a small 

 gap, hairs arise and are continuous down to the base. 



Maxillary palp. — This consists of two joints, and arises from the soft membrane 

 on the external border of the base of the galea, and not from any chitinous part. 

 The proximal joint of the palp is expanded at the base, and passes forward as a 

 long rod, slightly curved outwards and of uniform width ; its edge is deeply 

 chitinised and corrugated. At the junction with the second joint it expands 

 slightly, and from this region two rows of stiff hairs arise at the edge and converge, 

 passing for some distance down the first joint. The second, or distal, joint is 

 swollen near the base and then tapers to a blunt end, being about three-quarters of 

 the length of the first joint. Both joints of the palp are covered with hairs ; at the 

 base of the first joint are a few long, slightly pigmented setae, in addition to a 

 continuous covering of short hairs ; higher up are a few more darkly pigmented 

 hairs of medium length, each arising from a conspicuous rounded base. On the 

 proximal part of the second joint is a thick clothing of short stiff darkly-pigmented 

 hairs or spines ; hairs are also found to the extremity of the joint, the stiff ones 

 being succeeded by others which are finer and more transparent. In addition to 



(G419) e2 



