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Annals Entomological Society of America  [Vol. XIV, 
The same; a ventral view of the apex of the preabdomen showing the 
genitalia in distal view (*168); @ and c as in Figure 76; b, interlocking 
tubercles on the mesal face of the superior lobes; d, notch in caudal 
margin of sternite five above which is shown the group of char- 
acteristic heavy black spiny hairs. 
Sphegina sp. (*24). Ventral view of sternite five, the genitalic append- 
ages seen in their caudal aspect; a, the caudal ramus of the right 
style. 
The same, right style more enlarged. 
Sphegina sp. (*23). Ventral view of sternite five, the appendages seen 
in caudal aspect. 
Sphegina infuscata; cephalo-lateral view of the genitalia (*169).  s, 
peculiar larynx-like ring or shelf at apex of sustentacular apodeme. 
The same, in disto-caudal view (*19). 
PLATE XV. 
Sphaerophoria sp.; male genitalia (*88) in ventro-lateral aspect, slightly 
exposed; a, an apophysis from tergite ten to the penis rim; b, finger-like 
‘projection at cephalo-distal corner of style; c, sharp tooth terminating 
the submarginal keel of the style; d, the submarginal keel; e, a sclerite 
almost completely separated from tergite ten, at its baso-lateral 
corners. : 
Sphaerophoria scripta; cephalo-lateral aspect of genitalia (*173). 
Sphaerophoria sp.; genitalia (*263), in cephalo-lateral aspect. 
Sphaerophoria sulphuripes; genitalia (*142) in cephalic aspect. 
The same; in lateral view. 
Sphaerophoria menthastri; genitalia (*257), cephalo-lateral view of 
styles. 
Sphaerophoria sp.; lateral view of genitalia (*149). 
The same; in cephalic aspect. 
Sphaerophoria micrura; cephalic view of genitalia (*145). 
The same; in caudo-lateral aspect, showing also the terminal urites. - 
Xylota bicolor; cephalo-lateral view of genitalia (*277). See also Fig. 
110, Plate XVII. 
’ Chrysogaster sp.; caudal view of genitalia (*292); a, cephalic margin of 
superior lobe. : 
Calliprobola crawfordi; cephalic aspect of genitalia (*285). 
PLATE XVI: 
Helophilus similis; ventro-cephalic view of genitalia (*245). a and b 
mark the caudal and cephalic lobes respectively of the style in this 
and following Figures. 
The same, side view of cercus and style. 
Helophilus obsoletus; ventro-cephalic view of genitalia (*249), the left 
style omitted. : 
Helophilus bilinearis; ventro-cephalic view of genitalia (*243); left 
style in part omitted. 
Helophilus latifrons; ventro-cephalic view of genitalia (*246); right style 
omitted. 
The same, side view of style and cercus. 
Helophilus lunulatus; ventro-cephalic view of genitalia (*244). 
Helophilus sp.; lateral view of genitalia (*242). 
Tropidia albistylum, ventro-cephalic view of genitalia (*256); a, basal 
lobe on cephalic side of caudal lobe of style; b, cephalic lobe of style. 
The same, lateral view of cercus and style, showing the outline of the 
several lobes. Captions as in Figure 91. 
Tropidia quadrata; ventro-cephalic view of genitalia (*288). Captions as 
in Figure 91. Apop is an error for Sust. APoOD. : 
Helophilus modestus (=Tropidia cooleyi Seemans, cotype) lateral view 
of genitalia (*270). 
