210 
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Baiger 
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20. 
21. 
22. 
23. 
43. 
44, 
45. 
46. 
49. 
50. 
Annals Entomological Society of America  [Vol. XIV, 
The same in cephalo-lateral aspect. Captions as in Figures 15 and 19. 
Pipiza australis; ventro-cephalic view of genitalia (*223). 
Pipiza calcarata; dorsal view of apices of cerci and arms of tergite ten; 
the styles and post-anal hood seen in caudal aspect (*138). a, the 
upturned distal end of the hood; b, the concave side walls of the hood; 
their cephalic margins, after a sharp turn caudad, fuse just above the 
letter c, in the Figure; d, chitinized supporting bow of the side walls }; 
e, pilose convexity on the apophyses from base of hood, connecting 
with base of the style and the apex of the tenth sternite on each 
side and constituting the only supports of the hood; k, distal arms of 
the tenth sternite. 
The same; genitalia in side view. f, the free-standing, basal extensions 
of the setose membrane (g, Figure 24); g, the baso-cephalic con- 
tinuation of the framework margining the upturned part of the hood. 
Other captions as in Figure 22. 
The same; ventro-cephalic view of genitalia. g, setose membrane 
stretching across the cephalic face of the hood; 7, tendon-like rod 
from base of hood into the tenth segment; m, aperature to the inside 
of the hood. Other captions as in Figures 22 and 23. 
Pipiza (Heringia) heringi; ventro-cephalic view of genitalia (*198). 
PLATE XII. 
Chilosia similis; ventro-cephalic view of genitalia (*887 and 412). 3, 
cephalo-lateral keel of styles; c, caudo-lateral keel of styles. 
Chilosia tristis; ventro-cephalic view of genitalia (*370). a, the caudal 
excavation on blade of left inferior lobe. Other captions as in 
Figure 27. 
Chilosia pallipes; ventro-cephalic view of genitalia (*415). Captions as 
in Figure 27. 
Chilosia cyanea; ventro-cephalic view of genitalia (*402). 
Rhingia nasica; distal view of genitalia (*3820). The right style omitted 
to expose the penis lobes. 
The same, in cephalic view. Right half of urite ten and right style 
omitted. a, swollen lateral portion of basal rim of penis. 
Psilota buccata; genitalia (*140) in ventro-cephalic view. A, median 
ramus of left style; B, lateral ramus of right style. 
The same, more enlarged and in cephalo-lateral aspect. A, as in Figure 
33; B, lateral ramus of left style; a, apophysis from the right side of 
basal rim of penis to the tenth sternite; b, thickened lateral margins 
of tenth sternite; c, median split in the tenth sternite; d, the less 
chitinized median portion of the tenth sternite; e, catenulated area of 
superior lobe. 
Pipiza femoralis; cephalo-lateral view of genitalia (*137). a, tongue-like 
extension from basal rim of penis to the base of tenth sternite; , pal- 
mate lobe at cephalo-distal angle of superior lobe; c, prominent 
teeth at caudo-distal corners of superior lobes; d, boot-like apophysis 
from base of right superior lobe to the chitinous box at apex of sus- 
tentacular apodeme; e, lateral emargination of apex of penis sheath; 
f, cephalo-lateral arms or wings of penis-sheath. 
PLATE XIII. 
Mesogramma geminata; dorso-distal view of genitalia and tenth tergite. 
(#288). 
The same, in cephalo-ventral. aspect (*232). 
Mesogramma polita; ventro-cephalic aspect of genitalia (*321). 
The same, from the right side. 
Didea laxa; lateral view of genitalia (*154). 
The same, in cephalic aspect. 
