NO. 10 



I'lililJlNG OkCiANS OF AKAC II N IDA — SNuUiiRASS 



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I'lc. 28. — Acarina-Ixodidae, Argasidac, I^claptidac. 



A. Argas pcrsicus (Okcn), longitudinal section of capitulum (from Robinson 

 and Davidson. 1913, '14). B, C. l^crmaccntor variabilis (Say), examples of 

 tlio labrum as obtained by dissection (marRiiis of apical blade broken). D. same, 

 pharynx and labrum, dorsal. E. Ixodes ricinus L., pharynx and labrum. dor.sal 

 (from Arthur. 1946). F. Ornithodoros Iholoztmi ( L. and M.). labrum ("tonguc- 

 likc process") (from Bertram. 1939). fi. Dcriuacrntor 'variabilis (Say), 

 lal)rum, lateral. H. Dcrmaccnlor attdcrsoui Stiles, anterior wing plates of 

 pharynx with muscles, and section of oral aperture, posterior (from Douglas. 

 1943). I. Laclaps cchidninus Berl.. basal half of rostrum, ventral, showing 

 arrangement of the mouth parts (from part of figure by Stanley. 1931): a, b. 

 lateral processes of the rostrum. J, Ixodes ricinus L.. transverse section of 

 mouth parts and palps (from Arthur. 194^1). K. Argas persicus (Okcn). trans- 

 ver.se section of capitulum at base of hypostome (from Robinson and Davidson. 

 1913. '14). L, same, transverse section of capitulum through pharynx (from 

 Robinson and Davidson, 1913. '14). 



