104 The Larvid aiul P^pal Stages o/Agriotes obscurus 



mandibles of Peri'planeta australasiae, quotes Hansen {Ann. Mag. Nat. 

 Hist., 6, vol. XII, 1893), as recording the "lacinia mobilis" as occurring 

 in certain Coleoptera. The mandible articulates with the head, by 

 means of the condyle (co) and the ginglymus {gi). 



The first maxillae (Plate XVII, fig. 8) are strongly chitinised around 

 their outer margin, and are of a uniformly brown colour. They possess 

 a distinct cardo (ca) into which the chitinised margin continues, swelling 

 into a small dark area. There is no definite distinction between the 

 stipes (si) and the terminal lobe of the maxilhi. The stipes bears, 

 on its outer margin, two long thick setae and three shorter ones, all 

 close together, and placed rather more than half way up. The maxil- 

 lary palp {m])) consists of four joints, of which the first is broad in 

 comparison with its length, the second nearly as broad but longer, 

 the third narrower and shorter; all three segments are brown, darker 

 at the edges, with clear areas at their summits. Of the three segments, 

 each bears setae; the first, two irregularly placed; the second, two 

 at the summit and two on the outer margin; the third, two on the 

 summit. The fourth segment is short, rounded terminally, and of a 

 light brown colour. A galea (ga) and lacinia (la) are present in each 

 first maxilla. The galea is short, and composed of two joints; both 

 being about as long as the first two segments of the maxillary palp. 

 The terminal segment bears four short, slightly-tmsted setae. The 

 lacinia is not plainly difterentiated from the galea, and bears a large 

 number of closely-packed, slender, waving setae. 



The labium (Plate XVII, fig. 9) consists of the basal mentum, which 

 is brown, and slightly chitinised at the lateral margins. It bears, 

 at the margin on each side towards the base, a long curved seta, and 

 another on each side towards the apex of the labium. 



The mentum articulates with the palpiger, Avhich bears a two- 

 jointed palp on each side. The palpiger is shield-shape, and of a dark 

 brown colour, darker at the sides, and lighter in the median area, and 

 with a clear space across the anterior margin. It bears two long setae 

 placed anteriorly. The first joint of the labial palp swells out towards 

 its extremity, and bears a whorl of small setae, commencing about 

 half way up from the inside, and progressing outwards and upwards. 

 The second joint of the labial palp is rounded, and appears to possess 

 a flattened, pale area at the tip. 



Between the two labial palpi is the ligula (li) which bears a short 

 seta on each side. The further setae, much smaller than the previous 

 two, are placed at the base of the ligula. 



