PLATE XXIII. 

 Illmnvs {Bvmastus) ioxus, Hall. 



Page 420. 

 Fig. 1. The glabella and palpebral lobes of a large individual. 



Ill^nus imperator. Hall. 



Page 420. 



Fig. 2. The glabella and palpebral lobes of a specimen of this species, natural size. 

 " 3. The pygidium and part of four thoracic segments of this species, natural size. 

 \ These figures represent the natural size of reduced figures 15 and 17 of Plate 22. 



