192 THE IXTKuUMEXTAL SKELETON OF THE LMAGO. 



The Posterior Coxa is articulated with the metasternum, the 

 epimeron of the metathorax, and with the ventral plate of the 

 first abdominal segment. Its movements are more extensive 

 than those of the intermediate coxa, as it is capable of abduc- 

 tion, adduction and rotation. The latter movement is limited 

 by a hook which overhangs a ridge at the inferior margin of the 

 metapleuron, on which it travels as on a rail ; this hook springs 

 from the anterior sclerite. The inner sclerite articulates with 

 the capitellum on the entosternum of the metathorax. The 

 freedom of movement in the posterior coxo-sternal articulation, 

 permits the posterior legs to be used in cleaning the wings and 

 abdomen. 



The Femur is a tubular joint; its proximal extremity is par- 

 tially separated from the rest by deep lateral vertical inflections 

 and forms the trochanter. The constricted part of the femur 

 is strengthened by a ridge-like fold, which is received in a 

 furrow in the trochanter (Fig. 6). This arrangement permits 

 of more or less movement in a horizontal plane, passing through 

 the axis of the femur. 



The trochanter is slipper-shaped (Fig. 5). Its proximal 



Description of Plate IX. 



Fig. I. — The Left Aiuerior Leg seen from behind. 



Fig. 2. — The Right Intermediate Coxa seen from behind. 



Fig. 3. — The Left Intermediate Coxa seen from in front. 



Fig. 4. — The Left Posterior Coxa seen from behind : ex, anterior, and cx^, posterior, 

 and cx'^, internal coxal plate ; f, the fenestra ; fc, femur ; h, hamulus of posterior 

 coxa ; til, anterior, and ;/v\ posterior malleolus ; tr, trochanter ; ss, sensor)' 

 plate; /, tibia ; /', tarsus; //, unguis ; /, pulvillus. 



Fig. 5. — The Left Anterior Trochanter seen from behind and above. 



Fig. 6. — The Proximal Extremity of the Left Anterior Femur, with the Trochanter 

 removed. 



Fig. 7. — The Femoro-Tibial Articulation seen from its inner aspect : g, groove in 

 the femur ; ex, exterior apodeme ; fl, insertion of the flexor muscle. 



Fig. 8. — The Pulvilli, Claws and Planta of the Anterior Tarsus ; ventral aspect. 



Fig. 9. — Lateral view of the same. 



Fig. 10. — Upper portion of the Last Tarsal Joint seen from its under surface. 



Fig. II.— A portion of the Pulvillus of Carabus granulatus, showing the trumpet- 

 shaped setK, after Tuffen West. 



Fig. 12. — Tarsal Setre of Exoletus hirmorrhoidalis, after Tuffen West. 



Fig. 13.— Tarsal SetK : a, of Mylabris Cichori^e, after Tuifen West ; l>, of Calli- 

 phora erythrocephala, seen with -^^ oil immersion lens. 



