122 OHIO BIOLOGICAL SURVEY 



EXPLANATION OF PLATE XL 



Fig. 231 Milesia virginiensis, wing, showing a closed marginal cell and anterior 

 cross-vein beyond middle of discal cell. 



Fig. 232 Syritta pipiens, wing. 



Fig. 233 Tropidia quadrata, hind leg. 



Fig. 234 Syritta pipiens, hind leg, showing femur extraordinarily thickened and its 

 color markings. 



Fig. 235 Temnostonia excentricayfeuiate, lateral view of head. 



Fig. 236 Sphecomyia vittata, female, lateral view of head. 



Fig. 237 Mtlesia virginiensis, male, hind femur and tibia. 



Fig. 238 Sericomyia militaris, wing. 



Fig. 239 Sphecomyia vittata, wing. 



Fig. 240 Platychirus hyperboreus, lateral view of head. 



Fig. 241 Chrysotoxutn laterale, male, lateral view of head. 



Fig. 242 Platychirus peltat us, female, lateral view of head. 



Fig. 243 Chilosia pallipes, male, head from the side. 



Fig. 244 Platychirus hyperborcus, female. Showing widened front tibia and tarsus 

 characteristic of the genus. 



Fig. 245 Chrysogaster nigripes, female, medial view of antenna. 



Fig. 246 Helophilus similis, wing. 



Fig. 247 Chrysogaster put chella, female, dorso-medial view of antenna. 



Fig. 248 Chrysogaster nitida, male, dorsal view of antenna. 



Fig. 249 Chrysogaster pictipennis, female, dorsal view of antenna. 



Fig. 250 Melanostoma obscurum, male, wing. 



Fig. 251 Eristalis temporalis, male, abdomen except the first segment, illustrating 

 the color pattern ; the solid black represents the extent of opaque black mark- 

 ings on the specimen ; Ihe stippled area represents shining black ; the uncol- 

 ored indicates the yellow or translucent spots or bands. 



Fig. 252 Eristalis dimidiatus, abdomen showing color pattern; conventions as in 

 Fig- 251. 



