150 SIR J01IN LUBBOCK ON THE ANATOMY OF ANTS. 



In opposition to this the third muscle rises from the anterior portion of the central 

 ridge of the medipectus (PI. XII. fig. 2, q), and passing outwards and backwards is attached 

 to the inner posterior edge of the coxa. 



The fourth rises from the posterior portion of the central ridge of the medipectus, and 

 passing outwards is attached (PI. XII. fig. 2, r) to the inner edge of the coxa. 



The fifth rises partly from the anterior wall of the medipectus (PL XII. fig. 2, s), partly 

 from its median ridge, under q, and is attached to the outer anterior edge of the coxa. 



The last (PL XII. figs. 2, 5, t) rises from the medifurca, and passing downwards and 

 forwards is attached to the outer edge of the coxa. 



Posterior Portion of Thorax. 



The first elevator of the abdomen (it, PL XI. figs. 2 & 5) rises from the metanotum, on 

 each side of and not far from the central line, and, running parallel to the same muscle 

 on the other side, is attached to the upper anterior edge of the so-called knot. 



The second elevator of the abdomen [u\ PI. XI. fig. 2, PI. XII. fig. 2) rises from the 

 postpectus, and passing upwards, outwards, and backwards is attached to the upper 

 lateral anterior edge of the abdomen. It would draw the abdomen upwards and at the 

 same time sideways. 



The depressor of the abdomen rises partly from the metanotum behind the first 

 elevator, and partly (v, PI. XL fig. 2, PL XII. fig. 2) from the upper part of the postfurca, 

 and passing backwards and downwards is attached to the lower anterior edge of the 

 abdomen. 



The rotator of the abdomen rises from the metanotum just behind the first elevator 

 (tv, PL XL figs. 2, 5, and PL XII. fig. 2), and passing backwards, downwards, and out- 

 wards is attached to the lateral edge of the first abdominal segment. 



I now pass to the muscles of the posterior leg. 



The first muscle of the leg rises partly from the lateral wall of the metanotum 

 (x, PL XL fig. 5, PL XII. fig. 2) and partly from the upper part of the postfurca, and 

 passes downwards and backwards into the coxa. 



The second muscle also rises from the postfurca below the preceding (PL XII. fig. 2, x x ), 

 and passing downwards and backwards is attached to the upper posterior margin of the 

 coxa. It terminates above in a strong chitinous tendon, which is connected with the 

 postfurca by a number of tendinous filaments. 



The third muscle rises from the lateral wall (PL XII. fig. 2, y) of the mesothorax, 

 partly from that of the metathorax, and passing backwards is attached to the outer edge 

 of the leg. 



The fourth muscle is attached to the anterior edge of the postpectus (PL XII. fig 2, y l ), 

 and passing backwards and outwards is attached to the external margin of the leg close 

 to the preceding. 



The fifth is also attached to the anterior edge of the postpectus, but, passing directly 

 backwards (PL XII. fig. 2, z) above the preceding is attached to the exterior and anterior 

 margin of the leg. 



The sixth muscle is attached to the anterior edge of the metathorax, and passes 



