Exi'I.ANATlDN OF PlATE 4. 



Fig, I. Mac/tiliA coHJuncta, 11. sp. X 5. For 

 convenience, only tlie basal segment of the 

 left antenno is sliown and the left nnixinaiy 

 palpus is turned down. 



Fig. 2. Machilh ron/itiictn. Anterior as- 

 pect of the eves, X 25. 



Fig. 3. Miic/iilis coii/niida. Basal portion 

 of antenna, X 25. 



Figs. 4, 5. Mnc/iilincon/iiiic/a. Two of the 

 various forms of scale, X252. 



Fig. 6. Machilis coujitncta. A common 

 but anomalous scale, X567. 



Fig. 7. Seira mexicana, n. SP.X25. 



Fig. 8. Seira mexiiaiia. Lateral aspect 

 of right hind-foot, X567. 



Fig. 9. Seira mexicaiia. Lateral aspect 

 of right mucro and |>art of dens,X567. 



Fig, 10. Seira mexieatia. A scale from 

 the dorsal siile of the alnlonien,X 567. 



