LIST OF ILLUSTRATIONS. Xl 



Figs. 45-46. — TJirips spinosus. 45, head and prothorax of female, dorsal view; 

 46, left antenna of male, dorsal view. Figs. 47-49. — Thrips helianthi. 47, 

 head and prothorax of female, dorsal view; 48, left antenna of female, dorsal 

 view; 49, tip of abdomen of female, dorsal view. Figs. 50-54. — Trichothrips 

 fiavicauda. 50, head, prothorax, and forelegs of female, dorsal view; 51, tip 

 of abdomen of female, dorsal view; 52, head, prothorax, and foreleg of male, 

 dorsal view; 53, left antenna of male, dorsal view; 54, tip of abdomen of male, 

 dorsal view 52 



Figs. 55-57. Trichothrips fuscus. 55, head, prothorax, and foreleg of female, 

 dorsal view; 56, right antenna of female, dorsal view; 57, tip of abdomen of 

 female, dorsal view. Figs. 58-60. — Trichothrips hoodi. 58, head, prothhorax, 

 and foreleg of female, dorsal view; 59, left antenna of female, dorsal view; 



60, tip of abdomen of female, dorsal view. Figs. 61-63. — Eurythrips hindsi. 



61, head, prothorax, and foreleg of female, dorsal view; 62, left antenna of 

 female, dorsal view; 63, tip of abdomen of female, dorsal view 53 



Figs. 64-67. — Trichothrips aviplipennis. 64, head, prothorax, and foreleg of 

 female, dorsal view; 65, right antenna of female, dorsal view; 66, tip of abdo- 

 men of female, dorsal view; 67, left fore wing of female. Figs. 68-71. — Horis- 

 tothrips australix. 68, head, prothorax, and foreleg of female, dorsal view; 

 69, right antenna of female, dorsal view; 70, tip of abdomen of female, dorsal 



view; 71, right fore wing of female 54 



Figs. 72-75.— Leptothrips russelU. 72, head, prothorax, and foreleg of female, 

 dorsal view; 73, right antenna of female, dorsal view; 74, tip of abdomen of 

 female, dorsal \iew; 75, right fore wing of female. Figs. 76-79. — Zygothrips 

 femoralis. 76, head, prothorax, and foreleg of female, dorsal view; 77, right 

 antenna of female, dorsal view; 78, tip of abdomen of female, dorsal view; 



79, right fore wing of female 55 



Fig. l.—Gnathypops iyonis Jordan and Thompson 66 



Fig. 2. — Hoplichthys regani Jordan 67 



Fig. 3. — Hoplichthys gilberti 68 



Fig. 4. — Hoplichthys langsdorfii 68 



Fig. 5. — Hoplichthys langsdorfii Temminck and Schlegel 69 



Fig. 1. — Rictularia splendida. Tail of male. c. , latero-ventral combs; /. , ventral 



fans; pap., papillae; spic, spicules 78 



Fig. 2. — Rictularia splendida. Cross section, semidiagrammatic, in tail region 

 of male, c, latero-ventral combs;/., mid- ventral fans; int., intestine; I. I., 



lateral lines; v. s., vesicula seminalis 78 



Fig. 3. — Rictularia splendida. Anterior end of female showing vulva 79 



Fig. 4. — Rictularia splendida. Tail of female SO 



Fig. 5. — Rictularia splendida. Head of female 80 



Fig. 6. — Rictularia splendida. Head of female SO 



Fig. 1. — Ursus(Euarctos)vitabilis. Type specimen. Outer view of right lower 



jaw, § nat. size. a. Superior view, nat. size 97 



Fig. 2. — Canis armhru^teri , type specimen, portion of left lower jaw. 2. Outer 



view, § nat. size. a. Superior view, nat. size 98 



Fig. 3. — Canis armbru^teri. Cat. No. 7661, portion of right lower jaw. Outer 



view, f nat. size. a. Superior view, nat. size 99 



Figs. 4-8. — Lower fourth premolars and carnessials of Canids. All natural 

 size. 4, 4a, Canis occidentalis, Cat. No. 1006, U.S.N.M. 5, 5a, Canis arm- 

 brusteri, Cat. No. 7482, U.S.N.M. 6, 6a, Canis {Hyscins latrans), Cat. No. 

 3618, U.S.N.M. 7, 7a, Canis aureas, Cat. No. 181500, U.S.N.M. 8, 8a, 

 Vulpis, Cat. No. 7183, U.S.N.M 100 



