198 BRITISH TYROGLYPHIM. 



considered to represent a labium. The central por- 

 tion of the cephalothorax, behind the rostral tube, 

 forms a large, rounded, fleshy lobe which overhangs 

 the rostrum. The hinder part of the cephalothorax 

 widens greatly, its edge being the double curve known 

 as the "line of beauty." This edge is formed by a 

 large raised roll ; the median portion of the cephalo- 

 thorax is also raised ; but between the two, in the 

 hinder part of the cephalothorax, is a large shallow 

 depression, or dimple. There are a pair of hairs, close 

 together, near the anterior edge of the rostral tube. 

 On each side there is a very long hair near the edge of 

 the body a little in front of the first leg, a similar hair 

 near the posterior corner of the cephalothorax, and 

 a shorter one about midway between them ; also one 

 pair on the dorsum of the cephalothorax; these, and 

 all the other hairs on the creature, are simple and 

 setiform. 



Abdomen. The anterior edge has a somewhat excep- 

 tional form ; the central portion (about half the width) 

 projects boldly into the cephalothorax, is concave 

 anteriorly, and runs out laterally so as to form a short 

 horn or point. From the central projection the margin, 

 on each side of the body, runs back at an angle ; but 

 this portion also is concave anteriorly ; it forms a 

 raised roll with a large, shallow depression, or dimple, 

 behind it ; like that on the cephalothorax. When the 

 creature is very fully fed all these depressions vanish ; 

 they also disappear after death. There are two pairs 

 of hairs on the central projection of the anterior 

 margin of the abdomen ; the inner pair are the longer. 

 There are also two other pairs of hairs on the noto- 

 gaster (the hinder are the longer). The anus forms a 

 short, median, projecting, posterior point when seen 

 from above ; but a long slit when seen from the ventral 

 surface ; it is formed of two thin blades on edge, tying 

 close against each other, but capable of being separated 

 widely posteriorly. 



The Legs are short, the posterior pair not reaching 



