266 



Acarology 



are strongly raised and wartlike. The rostrum is Thyas-VikQ; the palpal 

 tibia lacks an end process. The coxal plates are divided in four groups; 



all tarsi have two simple claws and the 

 legs lack swimming hairs. The outer 

 genital organ of the female has two 

 large, strongly sclerotized and porose 

 plates with three large suckers on the 

 lateral margins of each. 



Figure 207 Ctenothyas verrucosa Lundblad. 

 Venter of female. (After Lundblad 1936) 



Genus: 



Ctenothyas Lundblad, 1936 



Type. Ctenothyas verrucosa Lundblad, 



1936 



Thermacaridae Sokolow, 1927 



Figures 208, 209 



Diagnosis: The body of these mites is entirely armored and the cen- 

 tral dorsal shield is united with the ventral plate by a thin but strong 

 suture. Two eyes lying in capsules are placed anteriorly on each side 

 and a median eye is present. Coxal plates i are united medianly with- 

 out any suture, but sutures separate coxal plates i, ii, iii, and iv. The 



Figure 208 Thermacarus nevadensis 

 Marshall. Ventral plates of female. 

 (After Marshall 1928) 



Figure 209 Theriiuictirus nevadensis 

 Marshall. Dorsum of male. (After 

 Marshall 1928) 



