EXPLANATION OF PLATE XL. 



Fig. 1. — Adelocephala sidiangulata, genital armature; side view cif end of tlie al)domen; la, suranal plate and its 



terminal forks; 16, side view of the harpes (Id), jienis, and suranal plate; Ic, harpes and penis, from 



beneath; 1(/, harpes and penis. 

 Fig. 2. — Adehcepliala bicolor, genital armature, suranal plate, from above; 2'i, a clasper; 2b, side view fif suranal 



plate, penis, and i)enis sheath. 

 Fig. 3. — Adelocephala heilighrodlii, genital armature, seen from above; 'Aa, side view of elasper; 36, genitals, seen from 



beneath, ./ knoljlike; 'ic, the same side view showing plainly the relations of the penis to its sheath, 



the dentate-divided end of the suranal plate, and the external clasper. 

 Lettering of the figures. — cl, clasper; Id, harpes; /), penis; ;/, penis .sheath; s, suranal plate; s', specialized, often 



toothed end of the suranal plate; YIII, IX, X, 8th-10th abdominal segment. 



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