

LIST OF ILLUSTRATIONS. 115 



FIG. 23. Rocky Mountain Locust (Caloptenu9 xprelus Thomas) ; a, a, a, female in differ- 

 ent positions, ovipositing ; It, egg-pod extracted from ground, with the end 

 broken open, showing how the eggs are arranged ; c, a few eggs lying loose 

 on the ground ; d, e, shows the earth partially removed, to illustrate an egg- 

 mass already in place, and one being placed; /, shows where such a masa 

 has been covered up. 



FIG. 24. Rocky Mountain Locust (Caloptemix xpretus Thomas); anal characters of 

 female, showing [horny valves of ovipositor; &, an upper valve ; c, a lower 

 valve all enlarged. 



FIG. 25. Rocky Mountain Locust (Caloptenux spretits Thomas); a, a, uewly hatched 

 larva; b, full grown larva; c, pupa. 



FIG. 26. Red-legged Locust (Caloptennsfeinitr-rubrum, DeG.). 



FIG. 27. Rocky Mountain Locust (Caloptenns apt-etna Thomas). 



FIG. 28. Rocky Mountain Locust (Caloptenm spretus Thomas); a, tip of abdomen of 

 male, side view ; 1), c, hind and top views of tip all enlarged. 



FIG. 29. Red-legged locust (Caloptenus femur-rubrum DeGeer) ; a, tip of abdomen of 

 male, side view ; b, c, hind and top view all enlarged. 



FIG. 30. Migratory Locust of Europe ((Edlpoda migrator'ia Linn.). 



FIG. 31 (p. 142). Map of North America, illustrating the country east of the Rocky 

 Mountains subject to the Ravages of the Rocky Mountain Locust. 



(Opposite p. 144.) Map of Missouri, illustrating the Locust Invasion of 1874. 



FIG. 32. Swarm of Locusts falling upon and devouring a wheat-field. 



FIG. 33. Differential Locust (Caloptenus differentialis, Walk.). 



FIG. 34. Two-striped Locust (Caloptenus biriltatus, Say). 



FIG. 35. Silky Mite (Trombidiinn aenccum Say) ; natural size shown at side. 



FIG. 36. Locust Mite (Astonia gryllaria LeBarou) ; greatly enlarged. 



FIG. 37. Mite parasitic on the House-fly (Tronibidiiim muscarum Riley) ; enlarged. 



FIG. 38. Red tailed Tachina-fly (Exorista militans Kirkp.) 



FIG. 39. Flesh-fly (Sarcophaga sarracenice Riley) ; a, larva; b, pupa; c, fly; d, head and 

 prothoracic joints of larva, showing curved hooks, lower lip (more enlarged 

 at g), and prothoracic spiracles ; e, end of body of larva, showing stigmata 

 (more enlarged at/), prolegs and vent ; h, tarsal claws of fly with protect- 

 ing pads ; i, antenna of fly all enlarged. 



FIG. 40. Seventeen-year Locust (Cicada septemdecim Linn.) ; one wing removed so as to 

 show ovipositor, b; a, beak. 



REPORT VIII. 



FIG. 1. Lebia grandis Heutz. 



FIG. 2. Peck's Spray Machine in operation. [From inventor.] 



FIG. 3. Spring Canker-worm (Paleaerlta vernata, Peck); a, caterpillar; b, eggs, natu- 

 ral size, one enlarged; c, one joint of larva, enlarged, side view; d, same, 

 dorsal view. 



FIG. 4. Fall Canker-worm (Anisopteri/x pometaria Harr.) ; a, b, egg enlarged, side and 

 top views; c, d, joint of larva, enlarged, side and dorsal views; e, eggs, 

 natural size ;/, caterpillar; g, femalejchrysalis ; h, tip of chrysalis, enlarged. 



FIG. 5. Spring Canker-worm (Faleacrita vernata, Peck), female chrysalis, enlarged. 



FIG. 6. Fall Canker- \vorm\Anisopteryx pometaria Harr.); a, male, b, female chrysalis, 

 enlarged ; a dorsal view of the tip of each shown beneath. 



FIG. 7. Spring Canker-worm (Paleacrlta vernata, Peck); , b, venation of wings; c, 

 one joint of male antenna?, greatly enlarged. 



FIG. 8. Fall Ca,Taker-wona.(Ani80pteryxpometaria Harr.); a, b, venation of wings; c, d, 

 one joint of male antenna?, greatly enlarged, side and under views. 



FIG. 9. Spring Canker-worm (Paleaerita vernata. Peck); a, male moth; b, female 

 moth uat. size ; c, portion of antenna of female ; d, one segment of female 

 abdomen ; e, ovipositor enlarged. 



