388 



BUREAU OF ANIMAL INDUSTRY. 



the family Ixodidge and in the larvae (fig. 101) of the family Argasidae. 

 It is hidden under the anterior extremity (fig. 71) in older stages of 



Fig. 48. — Dorsal view of larva of Boophihis annulatus of North America. Greatly enlarged. Original. 



'the family Argasidae. Several different parts may be distinguished, 

 as follows: 



(1) The base of the cajpitulum (capituli basis, mouth shield) is the hard 



Fig. 49.— Ventral view of larva of Boophilus annulatus of North America. Greatly enlarged. Original. 



basal portion (fig. 54) which is articulated proximally by a neck-like 

 structure (fig. 54) in the emarginated antero-median portion (camero- 



