Not only that , but some suggest that the Bronze-tailed Barbthroat ( T. n. loehkeni ) should also be thought a valid species and have the doubtful Christina 's Barbthroat ( T. n. christinae ) as a subspecies . In addition , some suggest that the Bronze-tailed Barbthroat ( T. n. loehkeni ) should also be considered a valid species and include the doubtful Christina 's Barbthroat ( T. n. christinae ) as a subspecies .