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Genus 22. Rhopoterpe Cabanis 138 Key to the Species of Rhopoterpe 138 55. Rhopoterpe stictoptera Salvin 139 Genus 23. Pittasoma Cassin 140 Key to the Species and Subspecies of Pittasoma 141 56. Pittasoma michleri michleri Cassin 141 57. Pittasoma michleri zeledoni Ridgway 142 Genus 24. Grallaricula Sclater 143 Key to the Species of Grallaricula 144 58. Grallaricula costaricensis Lawrence 145 Genus 25. Grallaria Vieillot 146 Key to the Subspecies of Grallaria guatimalensis 147 59. Grallaria guatimalensis guatimalensis Prévost and Des Murs 148 60. Grallaria guatimalensis princeps (Sclater and Salvin) 149 61. Grallaria guatimalensis mexicana (Sclater) 150 62. Grallaria guatimalensis ochraceiventris Nelson 151 Genus 26. Hylopezus Ridgway 152 Key to the Species and Subspecies of Hylopezus 153 63. Hylopezus dives (Salvin) 154 64. Hylopezus perspiciliatus perspicillatus (Lawrence) 155 65. Hylopezus perspicillatus lizanoi (Cherrie) 156 66. Hylopezus perspicillatus intermedius (Ridgway) 156 Family Furnariidæ 157 Key to the Central American Genera of Furnariidæ 159 Genus 1. Sclerurus Swainson 163 Key to the Species and Subspecies of Sclerurus 164 1. Sclerurus canigularis Ridgway 166 2. Sclerurus mexicanus mexicanus Sclater 166 3. Sclerurus mexicanus pullus Bangs 168 4. Sclerurus guatemalensis (Hartlaub) 169 Genus 2. Xenops Illiger 170 Key to the Species of Xenops 172 5. Xenops genibarbis mexicanus (Sclater) 172 6. Xenops rutilus heterurus (Cabanis and Heine) 175 Genus 3. Margarornis Reichenbach 177 7. Margarornis rubiginosa Lawrence 178 Genus 4. Premnoplex Cherrie 180 Key to the Subspecies of Premnoplex brunnescens 181 8. Premnoplex brunnescens brunneicauda (Lawrence) 181 Genus 5. Acrorchilus Ridgway 183 Key to the Species of Acrorchilus 184 9. Acrorchilus erythrops rufigenis (Lawrence) 184 Genus 6. Synallaxis Vieillot 186 Key to the Species and Subspecies of Synallaxis 188 10. Synallaxis erythrothorax Sclater 189 11. Synallaxis pudica pudica Sclater 191 12. Synallaxis pudica nigrifumosa (Lawrence) 192 13. Synallaxis albescens latitabunda Bangs 194 14. Synallaxis albescens hypoleuca Ridgway 195 Genus 7. Pseudocolaptes Reichenbach 196 Key to the Species of Pseudocolaptes 197 15. Pseudocolaptes lawrencii Ridgway 197