2 Phalacropsylla allos male basimere and telomere. Arrows define ventral margin of basimere without sinus 3 Phalacropsylla nivalis male basimere, telomere, distal arm of S-IX, and aedeagus. White arrows define margin of sinus in ventral margin of basimere. AA = angular apex of basimere; HL = hyaline lobe of distal arm of S-IX 4 Phalacropsylla oregonensis, male holotype basimere, telomere, and distal arm of S-IX. Arrow indicates small sinus in ventral margin of basimere 5 Phalacropsylla paradisea, male basimere, telomere, and distal arm of S-IX. Arrows define margin of deep sinus on ventral margin of basimere. Scale = 0.2 mm