208 Annals Entomological Society of America [Vol. XIV, 
SUP MODE eee ee Superior lobe, the more caudal of two pairs of lobes or append- 
ages arising from the apex of the penis sheath. 
SUStApOGer nae Sustentacular apodeme, an internal, chitinous rod lying along 
the axis of the penis. 
Repeat eetncnen oer ota bi Tergite, the tergum of an abdominal segment. 
Peres.) as eee Tergite. 
att resteae tenons Sis) Mechs Urite, an abdominal segment. 
Sternal Cornua..... A pair of processes standing caudad of the anus and mediad of 
the styles. 
Superior lobe, the more caudal of two pairs of lobes or append- 
ages arising from the apex of the penis sheath. 
Other legends are explained in connection with the several Figures. The 
number preceded by * in the explanation of the Figures is the serial number of the 
specimen from which the illustration was made. 
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loo 
aed 
miu tch ole elk: 
IPS IDS 
Dorsal view of abdomen of Chilosia sp., with the genitalia in the retracted 
position. . 
The same in ventral view. 
Tip of abdomen of Temnostoma sp., with the genitalia in the retracted 
position. Dorsal view. 
The same in ventral view. 
Tip of abdomen of Microdon sp., with the genitalia in the retracted 
position. Dorsal view. 
Tip of abdomen of Syrphus arcuatus, with the genitalia in the retracted 
position. Ventral view. 
The same in dorsal view. 
Tip of abdomen of Chrysotoxum sp., in ventral view, showing the genitalia 
in the retracted position. 
The same in dorsal view. 
Dorsal view of abdomen of Mesogramma geminata, with the genitalia 
partly exposed. 
Tip of abdomen of the same more enlarged and in ventral view. 
Tip of abdomen of Eristalis sp. from the right side, with the genitalia 
and postabdomen extended to show especially the course of the right 
lateral conjunctiva and the position of the spiracles. 
Tip of abdomen of Eristalis sp. from the left side, with the postabdomen 
and genitalia extended to show the course of the left lateral con- 
junctiva and the position of the spiracles. 
A diagrammatic representation of the various parts represented in the 
male genitalia of the Syrphide, dextro-cephalic view; A, cephalic 
margin of the style; B, caudal margin of the style. 
PLATE X. 
Paragus bicolor; ventro-cephalic view of genitalia (*132). a, apophysis 
from penis sheath to base of superior lobes, equivalent to the lateral 
wings of the penis sheath in other genera; 6 and ¢ caudal and cephalic 
lateral horns, respectively, of penis sheath at each side. 
The same in lateral view. Captions as in Figure 5. The short, slender 
spine from the apex of the sustentacular apodeme is shown in black 
between the base of the cephalic horn of penis sheath (c) and the base 
of the inferior lobes. 
Paragus quadrifasciatus, disto-lateral view of genitalia (*183). 6, the 
two teeth from the apex of the sustentacular apodeme. 
The same in distal view. 6, the more caudal of the two teeth from the 
sustentacular apodeme. 
Paragus tibialis, ventro-cephalic view of genitalia (*175). 
