144 
Indiana University Studies 
FIGURES 23 TO 46 
28. N. floricola. Anther galls. 
24, 25. N. vemus exiguus. Ament stem and anther capsule galls, show- 
ing gall dimorphism; see also figure 26. 
26. N. vernus tectus. Gall in young leaf bud ; typical of the species. 
27. N, saltatorius. Gall, cross section. 
28. N. saltatorius texanus. Gall. 
29. N. saltatorius decrescens. Gall. 
30. 31. N. saltatorius saltatorius. Galls, top views. 
32. N. verrucarum macrocaryse. Gall; cross section. 
33. N. veri'ucarum macrocarpse. Gall; typical of the species. 
84. N. niger nigripes. Gall; with figures 35 and 43 shows differences 
in varieties of the species. 
35. N. niger papillosus. _Gall. 
36. N, cockerelli. Gall; taken from Beutenmuller’s original figure. 
37. N. howertoni. Gall. 
38. N. howertoni. Gall; cross section. 
39. N. niger engelmanni. Galls; habit. 
40. N. umbilicatus. Gall. 
41. N. umbilicatus. Gall, cross section. 
42. N. niger nigripes. Gall, cross section. 
43. N. niger pattersoni. Gall. 
44. N. minutus pallidus. Anther galls; with figure 45 shows gall di- 
morphism. 
45. 46. N. minutus minutus. Petiole galls. 
