EXPLANATION OF PLATE X. 



The upper half of the plate (Figs, i to 6) 



relates to the genus . . . . Nyssorhynchus. 



The lower half of the plate (Figs. 7 to 11) 



relates to the genus . . , . Nyssomyzomyia. 



Details of the upper half of the plate.— 'From left to right the 

 drawings are, (i) abdomen from the dorsal aspect, (2) abdomen 

 from the ventral aspect, (3) last segment of abdomen and genitalia, 

 (4) thorax. Fig. 5 shows three of the abdominal scales as 

 drawn with the aid of a camera lucida under a j-V-inch oil immer- 

 sion objective and low eyepiece. Fig. 6 shows some of the 

 thoracic scales drawn by the same method. The three thoracic 

 scales to the left are from fuliginosits and the three to the right 

 are from maculatus. 



Details of the lower half of the plate. — Genus Nyssomyzomyia. 

 The thoracic and abdominal scale ornamentation of rossi is shown. 

 Fig. 8 shows the ventral surface of the last abdominal segments. 

 The long pointed false scales and the hair on the right of the plate 

 are from the anterior promontory and mid region of the dorsum of 

 the thorax; and the two true scales below the short black line. 

 (Fig. II) are from the ventral surface of the last abdominal seg- 

 ment. 



