152 



SIE JOHN LUBBOCK ON THE ANATOMY OF ANTS. 



The abdomen is moved by two muscles (PI. XI. fig. 2, PI. XII. fig. 8) situated in the 

 so-called first segment or knot. 



The first of these muscles occupies the greater portion of the upper part of the knot, 

 and, passing downwards and backwards, is attached to the lower wall of the abdomen. 



The second muscle is attached to the anterior wall of the knot, immediately below the 

 preceding, and, passing straight backwards, is attached to the upper wall of the 

 abdomen. 



DESCRIPTION OP THE PLATES. 



Met. Metathorax. 

 Sp 3 . 3rd pair. 



The lettering used for the different figures is as follows : — 



H. Head. Pr. Prothorax. Mes. Mesothorax. 



Sp 1 . 1st pair of spiracles. Sp". 2nd pair. 



Z. Membrane connecting the thorax with head. 



.Z 1 . „ „ the propectus with niedipectus. 



Z 2 . „ ,, the prouotimi with the propectus. 



An. Antefurca. 



Med. Medifurca. 



Po. Postfurca. 



gl. Site of thoracic salivary gland. 



P. Propectus. Pr, and in some figures B, Pronotum. 



A". Processes of the propectus. G l . 1st ganglion. 



G\ 3rd ganglion. G\ 1th ganglion. L 1 . Base of 1st pair of legs. 



D. Base of 2nd pair of legs. V. Base of 3rd pair of legs. 



C. Anterior plate of propectus. T. Posterior plate of propectus. 



Ab. Abdomen. fm. Femur. tr. Trochanter. Cx. Coxa. 



G- 



W. Processes of the head. 

 2nd ganglion. 



Muscles. 



a. 1st elevator of the head. 

 b\ 2nd depressor of the head. 

 c'. 3rd rotator of the head. 

 e. Protractor of the head. 

 g. Depressor of antepectus. 

 r. 3rd muscle of anterior leg. 

 m. Depressor of prothorax. 

 /;. '2nd muscle of middle leg. 

 s. 5th muscle of middle leg. 

 «'. 2nd elevator of abdomen. 

 w. 1st rotator of abdomen. 

 y. 3rd muscle of posterior leg. 



2nd elevator of the head. /;. 1st depressor of the head. 

 1st rotator of the head. c\ 2nd rotator of the head. 



& d'. 1th and 5th rotators of the head. 



a. 

 e. 

 d 



f. Elevator of antepectus 

 h. 

 k. 

 n. 



1st muscle of anterior leg. 

 4th muscle of anterior leg. 



/'. Elevator of antepectus. 

 i. 2nd muscle of anterior leg. 

 5th muscle of anterior leg. 



'1- 

 t. 



V. 



x. 



f- 



_i 



o. 

 r. 

 u. 



ft. Depressor of wings. 

 it. Elevator of abdomen. 



Elevator of prothorax. 

 3rd muscle of middle leg. 

 6th muscle of middle leg. 

 1st depressor of abdomen. 

 1st muscle of posterior leg 

 lth muscle of posterior leg 

 (J th muscle of posterior leg. 



6. Elevator of wings. 



<fr. Depressor of abdomen 



1st muscle of middle leg. 



4th muscle of middle leg. 



1st elevator of abdomen. 

 v'. 2nd depressor of abdomen. 

 x'. 2nd muscle of posterior leg. 

 z. 5th muscle of posterior leg. 



