Hybrid are ‘unofficial’ rudiments not listed in Pas (Percussive arts society) 40 fundamental rudiments list compiled by PAS International Drum Rudiment Committee. Usually are created combining the official rudiments in new way and sticking patterns. There’s no official list of this rudiments and new hybrids are constantly added, but there are some good list accepted by drummers community.

1. A foundamental source is this article by Joel Smales, published in April 2005 on Pas magazine: Hybrid snare drums rudiments (.pdf file) (see that scan is not so good, but readable).

2. The best educational page is on Vic Firth site, with scores and video lesson: Vic Firth Hybrid Rudiments Series

3. A good ‘social’ list is is the 128 hybrid rudiments book (.pdf file) originally posted on a thread of Drumlines.org: from Egg Beaters to Flive-a-diddle, from Irish five to Cheese-Cha. The complete list of rudiments in the book is at the end of this post.
The .pdf file is downloadable also at ‘unofficial’ (and probably not updated) locations on wadrumline.org and here

4. Another good and free downloadable collection of hybrid is on cyclopspercussion.com.
Another good page of hybrids is here

5. Other links
Planet Chop’s Drum Corps Hybrid Rudiment Page

Here’s the 128 hybrid rudiments list

A.
1. Alternated Cheese Pataflafla
2. Alternated Pataflafla
B.
3. Book Marks
4. Book Reports
C.
5. Casey Claw
6. Chatachichi
7. Cheese
8. Cheesecha
9. Cheeselet (Cheese Flam Accent)
10. Cheese Back Flip
11. Cheese-Cha
12. Cheese Chain
13. Cheese Chuchuddas
14. Cheese Chut-a-chu
15. Cheese Dachuda
16. Cheese Double Paradiddle
17. Cheese Fubars
18. Cheese Inverted 3’s
19. Cheese Inverts (Inverted Cheese Flam Tap)
20. Cheese-Ka
21. Cheese Paradiddle
22. Cheese Paradiddlediddle
23. Cheese Pataflafla
24. Cheese Roll
25. Cheese Triple Paradiddle
26. Choo-Choo
27. Chuchuddas
28. Chutra-Cheese
29. Chutra Drag
30. Chutuddas
31. Chut-A-Chu
32. Chut-Cheese
D.
33. Dachuda
34. Diddle-Egg-Five
35. Diddle-Flafla
36. Diddle Herta
37. Doctorial Thesis
38. Double Accented Single Flam Drag
39. Double Flam Drag
40. Double Flammed Swiss Triplets
41. Doubled Flam-Flam
42. Drag Patty
43. Duchudda
44. Duchudda Swiss
45. Du-Cheese
46. Du-Fives
E.
47. Egg Beaters
F.
48. Flaflam Drag
49. Flam Beaters
50. Flam Cheese Paradiddle (2 Flams)
51. Flam Cheese Paradiddle (3 Flams)
52. Flam Cheese Paradiddle (4 Flams)
53. Flam Drag Paradiddle
54. Flam Double Paradiddle
55. Flam 5 Flafla
56. Flam Five Patty
57. Flam Fivelet (Flam Accent Five Stroke Roll)
58. Flam Fives (Flam 5 Stroke Roll)
59. Flam-Flam
60. Flam Paradiddle (2 Flams)
61. Flam Paradiddle (3 Flams)
62. Flam Paradiddle (4 Flams)
63. Flam Roll
64. Flam Stutters
65. Flam Tap Paradiddle
66. Flam Threes (Flam Triple Stroke Roll)
67. Flam Triple Paradiddle
68. Flamacue-Diddle
69. Flamill Drags
70. Flammed Double Mill
71. Flammed Doubles
72. Flammed 3-2-1′s
73. Flammed Triplets
74. Flamtas
75. Flive-A-Diddle
76. Fubars
77. Fubars 5′s
G.
78. Grandmas
79. Grandpas
H.
80. Herta
81. Hulka Helecopter
I.
82. Inverted Cheese Flam Accents(Same Hand Cheese Flam Accents)
83. Inverted Cheese Flam Tap (see also ‘Cheese Inverts’ n. 19)
84. Inverted Cheese Paradiddle-diddle
85. Inverted Cheese Triplet Pataflafla
86. Inverted Flam Tap
87. Inverted Inverts
88. Inverted Paradiddlediddle
89. Inverted 3’s
90. Inverted Triplet Pataflafla
91. Inverts (also see Inverted Flam Tap n.84)
92. Irish Five
M.
93. Macs
94. Malf Taps
95. Malfs
O.
96. 1 Hand Flam Drag
97. One Handed Flam Fives
98. Opie’s
P.
99. Parabuzzle
100. Paradiddle-Flafla
101. Patty Fives(Pataflafla Flam Five Stroke Roll)
102. Patty Sevens (Pataflafla Single Stroke Seven)
103. Poly Flam Drag
R.
104. Ratamaswiss
105. Ravioli
106. Reverse Paradiddle-diddle
107. Ripits
S.
108. Same Hand Flam Accents
109. Shirley Murphy
110. Shock-A-diddle
111. Single Backs
112. Single 5
113. Single Hand Fives (Single Hand Five Stroke Roll)
114. Single Hand Flam Fives (Single Hand Flam Five Stroke Roll)
115. Single Hand Flam Flam
116. Single 9
117. Single Stroke Drag (Herta)
118. Stutter Diddles
119. Swiss-A-Diddle
120. Swiss Cheese Invert
121. Swiss Drag
122. Swiss Triplet
T.
123. Tajada
124. Triple Flammed Swiss Triplets
125. Triple Herta
126. Triple Inverts
127. Triplet Pataflafla
128. Triple-Acue