7 2 ENÏOMOLOGISK TIDSKRIFT 1894. 



plates. The prosternum (d) is the longest and most narrow, one 

 third longer than broad, and overlaps posteriorly a little part of 

 the mesosternum (e), which is somewhat shorter and broader, a 

 little longer than broad, posteriorly overlapping the anterior margin 

 of the metasternum ; the metasternmn (f) is somewhat shorter and 

 considerably broader than the former, anteriorly having the sides 

 largely expanded and the anterior margin deeply emarginate, 

 posteriorly it overlaps the anterior median portion of the 2nd 

 abdominal sternite (s-), the sternite of the ist abdominal seg- 

 ment being evanished. To give a good description of the 

 obliquely ascending lateral parts of the thorax with the coxœ is 

 very difficult. The short coxje are articulated at the outer margin 

 of the sterna a short way behind the beginning of the posterior 

 half of the latter; the portion, visible from below, of the coxa? 

 of the ist pair of legs (o) is very short, while it is somewhat 

 longer on the two other pairs. At the hindmost pair of coxas an 

 almost semilunar iitrochantin ^ (n) can be pointed out with cer- 

 tainty; at the second pair of coxœ the trochantin (m) is a narrow 

 plate, directed obliquely forwards and outwards. If we will try 

 to indicate one of the plates in pro thorax as being the trochantin, 

 it must be a very long plate (1), directed forward and anteriorly 

 pointed, the interior half of which (with the posterior, long angle 

 connected with the coxœ) is overlapped by the protruding lateral 

 margin of the prosternum. The trochantins thus being drawn in 

 between the thoracic plates is a very different structure from that 

 found in Machilis, where the trochantins are free and very di- 

 stinctly constitute the ist joint of the legs (see my note in »Zool. 

 Anz.»). In the prothorax is found in the lateral wall one large, 

 oblong plate, which consequently must be the epimcroii (PI. 2, 

 fig. I, g). In the mesothorax are found 2 well developed plates 

 i,fig. I, h), which I think are most correctly interpreted as the 

 bipartited epimeron, and in front a smaller plate (i), most likely 

 interpreted as cpistenunn. In the metathorax only one single, 

 arched plate, the epimeron (k), is found, the lateral wall being 

 to a great extent occupied by the anteriorly strongly expanded 

 metasternum. 



d. The legs. These are rather short, comparatively rather 

 stout and vigorous, and increase strongly in length from the first 



8 



