582 IVAR TRAGARDH 



Texture very varying in the different parts of the body. The micro- 

 texture of the cuticle of the dorsal and ventral side is extremely finely punc- 

 tured or rather the  punctures appear as very small orifices of canals in the 

 thick cuticle. But at the lateral sides of the propodo- and hysterosoma there 

 is quite another net-like or scaly texture, due to small, rounded, obliquely 

 raised discs. 



Propodosoma (fig. 57) long, of almost even width except anteriorly where 

 it is moderately pointed and in the posterior end where it widens to almost 

 twice its width, with evenly concave sides. The anterior edge of the rostrum 

 is very thin and quite hyalin; the upper side is flattened and almost perfectly 

 horizontal to the posterior margin but slopes gently downwards from the la- 

 mellar hairs. It is on both sides bordered by a very low and narrow but dis- 

 tinct ridge probably corresponding to a lamella. The posterolateral angles 

 project as thin, horizontal blades with slightly wavy posterior edges. Near the 

 posterior margin there are two irregular, ear-shaped ridges, open at the anterior 

 ends. The cuticular punctures are in the posterior part of the propodosoma 

 arranged in fine lines which radiate from the pores, where the interlamellar 

 hairs are inserted, towards the periphery of the ear-like ridges; further for- 

 wards they are arranged in transverse rows along the lateral ridges. 



The interlamellar hairs are short and rather stout and blunt, almost 

 perpendicular, only befit backwards near the top; they are inserted almost twice 

 as far apart as the distance between them and the pseudostigmata. The 

 lamellar hairs and the rostral hairs are fairly long, flexible and whiplike and 

 placed closely together, the rostral hairs being inserted more laterally and 

 further down the sides than the lamellar hairs. 



The pseudostigmata are placed laterally on the same level as the lateral 

 ridges and consequently directed obliquely outwards and upwards. They have 

 a rather small, circular opening which widens, becomes almost sphaerical and 

 has radiating septa and finally narrows and bends forwards. The pseudostig- 

 matic organs have a fusiform head and fairly stout peduncle slightly longer 

 than the head and bent in an even curve outwards, upwards and backwards. 



Mouthparts. The palps (fig. 54) have 5 joints; the ist joint is very 

 short and ringshaped; the 2nd joint is cylindrical, twice as long as 3rd one 

 and has two long, feathered hairs pointing downwards and forwards, the pos- 

 terior one being twice as long as the anterior one and inserted on the exterior 

 side subdorsally, the other one inserted on the exterior side subventrally; 

 3rd joint cylindrical, with one long ventral hair; 4th joint widens towards the 

 end and has one ventral terminal hair and one dorsal, a little further back; 

 5th joint narrow, cyUndrical in the proximal half, tapering towards «the top; it 

 has in the proximal half a ring of 4 curved, pointed hairs, at the top two short 

 and straight, hyalin bristles, one larger similar dorsal, one a little in front of 

 the middle and one smaller similar ventral, one subterminally, all four pointing 

 in the same direction as the joint. 



Hypostome (fig. 53) very large, almost twice as long as the maxillae, with 

 broadly rounded posterior margin, finally punctured, the punctures being arranged 

 in radiating lines along the sides. Hypostomal hair short and straight, inserted 

 a little nearer the lateral margin than to the centre and a little in front of the 



