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Thanks for your input Tomi. It's good to question identifications - keeps us all on our toes! However, comparing Figures 40 and 48 in Whitaker's RES Handbook, it seems to me that on head chaetotaxy alone, Lorin's specimen cannot be Xenopsylla. The apparent antesensilial (antepygidial) seta is at a rather strange angle, and I wonder whether it is a displaced seta from elsewhere on the specimen? So I'll stick with Pulex for now. :)