1921] 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
36. 
37. 
38. 
12. 
13. 
14. 
15, 
rig. 
“17 
ig. 18. 
5 AW: 
Metcalf: Genitalia of Male Syrphide 209 
Chrysogaster pulchella; caudo-lateral view of genitalia (*131). a, thorn 
on inferior lobe a little laterad of the cephalic margin; c, thorn on 
cephalic margin of inferior lobe at point of fusion of the two lamelle; 
d, tooth on the mesal lamella of inferior lobe; e, the deer’s-head-like, 
disto-caudal termination of the superior lobe. 
The same in cephalo-lateral aspect; a, c, and e as in Figure 36; b, thumb- 
like projection at disto-caudal angle of inferior lobe; f, the joint of 
basal rim of penis at the point of articulation with the tenth tergite; 
g, caudo-basal continuation of the inferior lobe to the penis rim; 
h, slender apophysis of left side of penis rim to base of tenth sternite. 
Chrysogaster parva; genitalia (*254) from the right side. a and b, 
bispurred, disto-caudal termination of the inferior lobe; c, more 
cephalic, apical finger of superior lobe; d and e, the two spurs at the 
apex of the more caudal finger of the superior lobe; f, the ‘‘breast’’ of 
the bird-head-like ejaculatory hood. 
The same, in caudo-distal aspect. Captions as in Figure 38. 
Chrysogaster sp.; ventro-cephalic view of genitalia (*253). 
The same, in cephalo-lateral aspect. a, basal offset of style. 
A disto-caudal view of cerci and styles. Captions as in Figure 41. 
Chrysogaster nigrovittata; genitalia (*162) in cephalic aspect. d, opening 
of the ejaculatory duct; f, serrate flaps, overhanging the opening of the 
ejaculatory duct. 
The same, from the right side. a, emargination of the tenth tergite at 
base of style. 
PLATE XI. 
Pipiza nigribarba; cephalic view of styles, post-anal hood and apex of 
penis (*200). d, the termination of the ejaculatory duct. The 
heavy bristles shown on the left style arise on the caudal face of the 
style and their bases should not be shown in this view nor in 
Figure 14. : 
The same, in distal aspect. a, the sclerites communicating between the 
styles, the tenth sternite and the post-anal hood. The post-anal hood 
is shown in caudal aspect between the styles and the parts marked a, 
at each side, and the cerci and apex of the penis at the ends. 
The same, in cephalic aspect; with the penis displaced cephalad, showing 
the tenth sternite and cephalic aspect of the post-anal hood. a, as in 
Figure 13; b, pilose side walls of post-anal hood; c, the free-standing 
base of the post-anal hood. 
Pipiza pisticoides; disto-cephalic view of the post-anal hood and left 
style (*185). a, the distal, upturned end of the post-anal hood; |, 
semi-globular, spinose crown of the post-anal hood, one of the best 
characteristics of the species; c, squarish prominence. of the caudal 
face of post-anal hood; d, the free-standing basal prolongations of 
the membranes on the cephalic face of hood; e, the apophysis-like 
rod from caudal face of the hood to the tenth sternite and styles, 
and forming the entire support of the hood; f, the double, drooping, 
median keel of cephalic face of hood; g, angular apophysis near base 
of style. 
The same, in dorso-caudal aspect. Captions as in Figure 15. 
Pipiza pulchella; dorso-caudal view of the genitalia (*134); the penis 
shown in cephalo-lateral aspect. a, chitinous box at apex of sus- 
tentacular apodeme; c, cephalic ramus of the inferior lobes; d, ear-like 
flaps at apex of post-anal hood. APpoD is an error for Sust. APOD. 
The same in cephalo-lateral view; the penis in about a distal view. 
Captions as in Figure 17. 
Pipiza pisticoides; genitalia from the right side; the right style removed 
to expose the post-anal hood. Captions a to g as in Figure 15; h, 
sharp, median keel on caudal face of penis; 7, short spur from apex of 
sustentacular apodeme. 
