SIK JOHN LUBBOCK ON THE ANATOMY OF ANTS. 147 



of the antepectus, and, passing trausversely across the segment, is attached to the 

 posterior and outer edge of the leg, at the summit of the projecting head or condyle. 

 It would tend to extend the leg laterally. 



The third (i 1 , PL XII. fig. 4) is attached to the antefurca, and, passing downwards 

 and outwards, is attached close to the preceding. 



The fourth and fifth muscles of the fore legs are of a different character, penetrating 

 into the coxa. The fourth rises from the upper edge of the antepectus in front of the 

 antefurca (PL XL fig. 4, and PL XII. fig. 4, k), and passes downwards into the coxa. 



The fifth rises partly from the hinder wall of the antefurca, partly from its posterior 

 spur (PL XI. figs. 1, 2, 4, & 7, /), and, like the preceding, passes down into the coxa. 

 The upper part of the muscle is joined by some fihres, which pass round the posterior 

 process of the antefurca and are attached to the pronotum. 



The seventh is attached to the outer and posterior edge of the coxa, and, passing 

 backwards and inwards, is attached to the anterior surface of the medifurea. It is not, 

 however, well shown in any of my sections. 



In addition to these muscles, the coxa contains two others, one of which rises from the 

 upper and outer wall and passes downwards and inwards, while the other, rising from the 

 upper and inner wall, passes downwards and outwards. 



The small trochanter (PL XII. fig. 1, tr.), in addition to the above-mentioned fibres of 

 the flexor of the femur, contains only a short single muscle, which at its lower end is 

 ittached to the thigh. 



The femur (PL XII. fig. 1, fm) contains two muscles. The extensor is attached to 

 she upper surface of the segment, the fibres being attached to one side of a long tendon, 

 svhich at its lower end is attached to a chitinous piece at the upperside of the head of 

 ;he tibia. The flexor is situated rather on the lower side of the segment ; but the fibres 

 liverge from both sides of the tendon, and some of them cross those of the extensor 

 nuscles. Some of the central fibres pass into the trochanter, and are attached to its 

 nner margin. The lower end of the tendon of the flexor is attached to a chitinous 

 irocess. 



The tibia presents some very remarkable points, with reference to which I may perhaps 

 )e permitted to quote a passage from a paper of mine published in the ' Microscopical 

 Journal,' 1877. 



Remarks on the Tibial Organ. 



In the year 1844 Von Sicbold* described a remarkable organ which he had discovered 

 n the tibiae of the front legs of Gryllus, and which he considered to serve for the purpose 

 |)f hearing. These organs have been also studied by Burmeister, Brunner, Hensen, 

 ^eydig, and others, and have recently been the subject of a monograph by Dr. V. Graberf, 

 vho commences his memoir by observing that they are organs of an entirely unique 

 haracter, and that nothing corresponding to them occurs in any other insects or, indeed, 

 n any other Arthropods. 



* " Ueber das Stinim- und Gehor-Organ der Orthopteren," Wicgmann's Arch. f. Natur. 1S44. 

 t Die tympanalen Sinnes-Apparate dcr Orthopteren, von Dr. Titus Graber, 1875. 

 SECOND SERIES. — ZOOLOGY, VOL. II. 20 



