42 REV. J. E. HULL ON 



footed ; and the Oxypoda, long-legged and swift-footed. They 

 may be formally characterised thus : — 



§i. Barypoda, 



Genital foramen of the male in the middle of the 

 sternal scutum, usually circular. 



Legs comparatively short, especially the first pair 

 Mouth parts nearly always inferior and invisible 

 from above. Lateral margin of the dorsum form- 

 ing a projecting ledge or ridge, very rarely white 

 rounded and unprotected. 



§ii. Oxypoda, 



Genital foramen of the male on or before the margin 

 of the sternal scutum, usually transverse. 



Legs usually long, especially i and iv. Rostrum 

 always conspicuous. Sides of the body rounded 

 and unprotected, except when the dorsal and 

 ventral scuta are continuous. 



SUB-FAMILIES. 

 i. Barypoda. 



1. Genital valve of $ central in sternal scutum : 



leg-grooves usually present ... ., UropodincE, 



Genital valve of $ behind the sternal scutum : 



no leg-grooves ... ... ... ... 2 



2. Dorsum broad behind with membranous centre Antemiophorina:, 



,, much longer than broad ... ... Zerconincc. 



ii. Oxypoda. 



1. Parasites of vertebrates. Epidermis glabrous, 



striate ... ... ... ... ... 2 



Living at large (except a few hirsute parasites) 3 



2. Stigmata dorso -lateral ... ... ... ... rtcroptiuit. 



Stigmata normal ... ... ... ... ... Dert)ia)iyssina. 



3. Fed. ii of ^ swollen, one or more joints spurred GajnasiiicE. 



,, not conspicuously crassatc or spurred Laelaptina. 



