154 SIR JOHN LUBBOCK ON THE ANATOMY OF ANTS. 



Plate XII. 



Fig. 1. Propectus of Lasius flarus, seen from below, x 100. 



H, head ; B, pronotum ; P, propectus ; X, processes of the propectus ; W, processes of 

 the head ; Z, membrane connecting thorax with head ; Cx, coxa ; tr, trochanter ; fm, femur. 

 Muscles : — b, first, and b l , second depressor of head ; c\ c-, second and third rotators of head ; 

 (j, depressor of antepeetus ; h, first, and i, third muscles of anterior leg. 

 Fig. 2. Longitudinal and horizontal section through the posterior portion of the thorax of Lasius flavus. 

 x 125. 



Pr, posterior margin of prothorax ; Mes, mesothorax ; L-, base of second, and L 3 , base of 

 third pair of legs; G 2 , .second, and G 3 , third thoracic ganglion; Ab, commencement of 

 abdomen. Muscles : — u, first, p, second, q, third, r, fourth, s, fifth, and /, sixth muscle of middle 

 leg ; u, first, and u\ second elevator of abdomen ; v, first depressor of abdomen ; x, first, x l , 

 second, y, third, y x , fourth, z, fifth, z 1 , sixth, and r 2 , seventh muscle of posterior leg. 

 Fig. 3. Longitudinal and horizontal section through the thorax of Lasius flavus. x 1.25. 

 Fig. 4. Transverse and vertical section through the prothorax of Lasius flarus. x 125. 



B, pronotum; P, propectus; L L, bases of legs; Cx, coxa; G, ganglion; An, antcfurca ; Z i , 

 membrane connecting the pronotum and propectus. Muscles : — c, first rotator of head; /, ele- 

 vator of antepeetus; h, first, /', second, /', third, /-, fourth muscle of anterior leg. 

 Fig. 5. Transverse and vertical section of thorax of Lasius flams passing through the second pair of 

 spiracles and the base of the middle legs, x 125. 



Sjr Sjr, spiracles of second pair ; Med, medifurca ; L L, bases of legs ; n, elevator of thorax ; 

 o, first, and /, sixth muscle of middle leg. 

 Fig. 6. Transverse and vertical section through the thorax of Lasius flavus, showing the postfurca. x 125. 

 Fig. 7. Metathoracic organ of Lasius flavus. x 125. 

 Fig. 8. Longitudinal and vertical section through the thorax of a queen of Lasius jiavus. x 50. 



H, head ; a', elevator of head ; b, first depressor of head ; GG G G, ganglia in depressor of 

 prothorax ; /3, depressor of wings ; 6. elevator of wings ; tt, elevator of abdomen ; </>, depressor 

 of abdomen. 

 Fig. 9. Longitudinal and vertical section through the thorax of a male of Lasius flavus. x 50. 

 An, antcfurca ; jB, depressor of wings ; 0, elevator of wings. 



