THE CATTLE GRUBS OR OX WARBLES | BE 
Fic. 6—Hypoderma lineatum: a, Unhatched eggs attached to hair; b, hatched 
eges on hair; c, third-stage larva, side view; d, fourth-stage larva, side view; 
e, fourth-stage larva, ventral view; f, posterior end of third-stage larva; g, pos- 
terior end of fourth-stage larva, just before molting (note fourth-stage spiracles 
in center with fifth-stage spiracles showing beneath) ; fh, posterior spiracles of 
fifth-stage larva. All much enlarged 
