94 Mr. J. 0. Westwood's Description, Sfc. 



ture of the tarsi, antennee, &rc. remove tliem from the genus above 

 described. From the preceding details it will, I think, be evident, 

 that, whilst Gnostus is most nearly allied to such of the Xylophaga 

 ef Latreille as possess five-jointed tarsi, it stands sufficiently de- 

 tached from the whole of them as to constitute a distinct sub-family 

 of its own. 



EXPLANATION OF PLATE VIIL 



Fig. 1. Gnostus formicicola, greatly magniiiecl. 



Fig. 2. Head seen from above. 



Fig. 3. Head seea sideways. 



Fig. 4. Antenna seen from behind. 



Fig. 5. Labrum. 



Figs. 6, 7. Mandibles. 



Fig. 8. Rlaxilla. 



Figs. 9, 10. Wenlum in different points of view. 



Fig. 11. Labium and labial palpi. 



Fig. 12. Prothorax seen obliquely from the side. 



Figs. 13, 14. Tlie lateral hooked portion in different points of view. 



Fig. 15. Scutellum. 



Fig. 16. Wing. 



Fig. 17. Fore leg. 



Fig. 18. Fore tarsus. 



Fig. 19. Middle leg. 



Fig. 20. Hind leg. 



Fig. 21. Meso and metathorax, abdomen and hind leg, from beneath. 



