644 0. B. HARDENBERG. 



and strongly chitinised; of the exposed^ lateral aspect only 

 the middle part chitinised, the basal and apical parts mem- 

 branous (g). The middle part bears two setas. Palpifer 

 broad and short, bearing one seta at its distal edge. Palpus 

 three-jointed, the two basal joints annular, the last in the 

 shape of a coue bearing several small sense papillge at the 

 tip. The basal joint has one seta placed more mediad than 

 that on the palpifer. Attached to the median aspect ot" the 

 first and second palpal joint we find the remains of the 

 maxillary lobes, consisting of two cylindrical processes, each 

 with a sense-cone at its tip and three dagger-shaped sense- 

 hairs. Three minute sense-cones are situated in front of the 

 maxillary lobes. 



Labium. — Characterised by a very strong development of 

 the chitinous sclerites of the mentum (f). Mentum with two 

 short set£e near the median line. Labial palpi two-jointed, 

 slender, terminal joint about half as long as basal joint. 

 Submentum for the greater part membranous and bearing 

 two long set^e near its posterior third. 



Thorax. — The thoracic segments, as mentioned, are very 

 massive, and each is provided with a broad dorsal chitinous 

 shield (PI. XLVI, fig. 3). On the prothorax this shield is 

 fused with the prespiracular plate and is pierced by the 

 prothoracic spiracle ; on the nieso- and metathorax the pre- 

 spiracular wart is separate from the dorsal shield. This pre- 

 spiracular wart bears two setse. The subventral wart or 

 plate is also armed with two setas. The legs are strong, the 

 claws pointed and slightly curved mediad at the tip, with a 

 median lobe at the base. Coxae large, the chitinous coxal 

 plates meeting in the median line. Thoracic plates uni- 

 colourous, no pattern as yet apparent. On the third thoracic 

 searment the dorsal shield on each side does not reach the 

 median line. 



Abdomen. — The abdominal segments are narrow, except the 

 eighth, with several chitinised setiferous plates (PI. XLVI, 

 figs. 1, 2). On segments 3 to 6 these plates are seven on each 

 side: the dorsal with one seta (1), the subdorsal with one 



