New species of Psylla from the western United States and biological notes By Jensen, D.D. Canadian Entomologist 88: 101-109, 1956 Cite: 1364150 with citation markup [cite:1364150]
Original descriptions for four species: Cacopsylla notapennis, C. pararibesiae, C. acuminata, & C. nigranervosa, plus a redescription of C. ribesiae
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