190 Young Larvae o/Lyctus brunneus Steph. 



the head. Just below this support is a small semi-circular piece of chitin 

 {lu) forming the lumen in which the crushing organ of the mandibles 

 work ; between this piece and the anterior border of the frons, a few setae 

 are found symmetrically arranged on either side. The frontal (/s) and 

 epicranial {es) sutures were barely visible. 



The maxillae (Text-fig. 1, 4) consist of two parts, an outer double- 

 jointed palp {mx), and an inner piece — the lacinial lobe {Id). The stipes 

 {si) is present, but the cardo was not distinguishable. The maxillary palp 

 is telescopic, and bears a few scattered setae and sensory pits ; the apical 

 joint terminates in five fleshy protuberances. The lacinial lobe bears 

 several stiff setae towards the apex; it is dorsal to the maxillary palp 

 and fused to it; lying venter is the labium {la), which is partially defined 

 by chitinised rods {rd) supporting it and the maxillae. The labium con- 

 sists of two single- jointed palps {Ip) arising from a broad fleshy base, 

 the vaginant membrane (ua), whose inner surface forms the ligula {li), 

 which bears scattered fleshy protuberances; there are a few of these on 

 the apex of each labial palp. The mentum {mn) and sub-mentum {sm) 

 are clearly defined. 



The thorax (Text-fig. 1, i) is well developed. The pro-thorax {'pt) partly 

 envelopes the head; and bears a pair of spiracles {tr). Each thoracic 

 segment consists of scutal {x), scutellar (2), epi-pleural {g), and sternal {h) 

 lobes. Each segment bears a pair of three jointed legs (Text-fig. 1, 5); 

 the pro-thoracic pair {pi) are more strongly developed than the others, 

 and terminate in a strong seta surrounded by three longer bristles ; the 

 meso- {msl) and meta-thoracic legs {mil) each bear two bristles towards 

 their apex. 



The abdomen (Text-fig. 1, i) consists of ten segments (1-10). The first 

 eight are composed of scutal {x), scutellar (2), epi-pleural {g) and sternal (h) 

 lobes. There is one bristle on each epi-pleural and a lateral row of four 

 on each scutellar fold towards the anterior border. On each of these 

 segments are a pair of spiracles, those of segments 1 to 7 being of uniform 

 size, whereas the pair on the 8th segment are approximately six times 

 as large as the others; a peculiarity which Perris (1876) considered — in 

 reference to the full-grown larva of L. linearis Goeze {canaliculatus Fab.) 

 — serves to distinguish the larva of Lyctus from all others. No pre- 

 scutal lobes were observed on the abdomen. The 9th and 10th segments 

 (Text-fig. 1, 6) consist of a series of fleshy protuberances functioning 

 as an anal foot; with the exception of a scutal lobe on the 9th segment, no 

 other lobes were discerned. The anus {an) is situated on the 10th seg- 

 ment and is partly enveloped by the hind margin of the 9th segment. 



