Xn LIST OF ILLUSTEATIONS. 



Page. 

 SomatocMora semicircularis.— Abdomen of female showing markings and terms 



used in describing them 11^ 



yigs. l-2.Somatochlora semicircularis, male. 1, dorsal view. 2, lateral view. 119 

 Figs. ^-4.— SomatocMora semicircularis, female. 3, dorsal view. 4, lateral 



view ^-" 



Figs. 5-lS. —Somalochlora semicircularis. 5, lateral view of segments 9 and 10 

 of abdomen of female, field No. 7. 6, dorsal view of segments 9 and 10 of 

 abdomen of female, field No. 12. 7, ventral view of segments 9 and 10 of 

 abdomen of female, field No. 12. 8, lateral view of segment 2 of male, show- 

 ing genital lobe and anterior hamule. 9, ventral view pf segment 2 of same 

 male as fig. 8. 10, lateral view of segment 2 of male, showing genital lobe 

 and anterior hamule. 11, lateral view of segment 10 and appendages of 

 male. 12, dorsal view of segment 10 and appendages of male. 13, ventral 



view of segment 10 and appendages of male 121 



Figs. 14-25. — Somatochlora semicircularis. Vulvar lamina of 12 females, show- 

 ing slight variations due largely to distortion in dry ing 122 



Figs. 2G-29.— Somatochlora semicircularis. Lateral views of segment 10 and 



appendages of 4 males, showing variations in tip due to distortion in drying.. 122 

 Figs. 2,Q-?,Q. Somatochlora semicircularis. Lateral views of abdomen in 7 



males, showing differences in color pattern 123 



Figs. "61 -A'i.— Somatochlora semicircularis. Lateral views of abdomen in 7 



males, showing differences in color pattern 124 



Figs. A\-bO. Somatochlora semicircularis. Lateral views of abdomen in 7 



females, showing variations in color pattern and length 125 



Figs. 51-57. — Somatochlora semicircularis. Lateral views of abdomen in 7 



females, showing variations in color pattern and length 126 



Fig. I.— Bison antiquus. Type. Part of skull. Horn-core restored to show 



form 165 



Yig. 2.— Bison antiquus. Skull at Ear Diam College. Frontal view 166 



Fig. ^.— Bison antiquus. Skull at Earlham College. View from the rear 166 



Pig. 4,— Bison occidentalis. Skull at Kansas University. Frontal view 170 



Fig. 5.— Bison occidentalis. Skull at Kansas University. Lateral view 171 



Fig. G.— Bison occidentalis. Skeleton at Kansas University 172 



Yig. 7. — Bison alleni. Skull in U. S. National Museum. View from the rear. 184 

 Fig. 8.— Bison alleni. Left upper molars of No. 7706, U. S. National Museum. 



W at right, X i 186 



Pig. Q.— Bison alleni. I-eft lower premolars and molars of No. 7706, U.S. 



National Museum. Xi ^^"^ 



Fig. 10.— Bison rcgius. Right upper molars of type. M ' at left. X J 195 



Fig. 1. — Molars (m ') and premolars (pm *) of lower jaws of the type of Camelops 



huerfanensis. Xf ^'^'^ 



Osmerus starksi, new species 293 



Fig. 1 .—Ooencyrtus chrysopx. Outline of antenna of female 347 



Fig. 2. — Signiphora giraulti. Front wing of female 348 



Fig. 5. Signiphora giraulti. Middle leg of female 348 



Fig. 4. — Xenomymar urirhi. Antenna of female 349 



Fig. b.—Xenomyimar urichi. Front wing of female 349 



Fig. 6. — Gonatocerus anomocerus. Antenna of female 350 



Fig. 7. — Anaphoidea latipennis. Outline of forewing of female 350 



Fig. 8. — Neomymar vierecki. Antenna of female • 351 



Fig. 1.— Dorsal and lateral views of skull: Glossophaga soricina (a), G. longi- 



rostris (b), and G. elongata (c) '^l^ 



Fig. l.—Microdon texanus. Type. Vomerine plate, nat. size. 1. Palatine 

 view. la. Section about middle point taken from posterior view 445 



