. Bulletin of the British Museum (Natural History) Entom Supp. 54 MORPHOLOGY AND TAXONOMY OF ADULT MALES with 2-8 (average 4-8) of medium length, 1-3-1-7 (average 1-5) times as long as width of segment ; with 1-2 usual sensilla basiconica. Segments IV-IX cylindrical ; lengths of these segments (in jx) 87-122 (average 109), 195-125 (average 118), 91-114 (average 101), 80-110 (average 100), 65-91 (average 76) and 57-76 (average 68) respectively, width varying form 17 to 23 [i., with distal segments wider than proximal ones ; with 12-19 (average 15), 15-22 (average 18), 12-19 (average 15), 1
. Bulletin of the British Museum (Natural History) Entom Supp. 54 MORPHOLOGY AND TAXONOMY OF ADULT MALES with 2-8 (average 4-8) of medium length, 1-3-1-7 (average 1-5) times as long as width of segment ; with 1-2 usual sensilla basiconica. Segments IV-IX cylindrical ; lengths of these segments (in jx) 87-122 (average 109), 195-125 (average 118), 91-114 (average 101), 80-110 (average 100), 65-91 (average 76) and 57-76 (average 68) respectively, width varying form 17 to 23 [i., with distal segments wider than proximal ones ; with 12-19 (average 15), 15-22 (average 18), 12-19 (average 15), 15-20 (average 16), 11-19 (average 14) and 11-14 (average 13) respec- tively, but no ; antennal bristles on segments VIII and IX not markedly different from , sometimes somewhat thicker. Segment X : terminal part not constricted ; 53-78 (average 70) [i. long and 19-23 (average 21) pi wide ; carrying 4-11 (average 8-6) , 3 capitate subapical setae and 5 antennal bristles of which the 3 long ones are about half as long as the segment and the 2 shorter ones equal to or somewhat shorter than the ; with 2 sensilla basiconica ventrally, one near apex and the other more proximal. Thorax 445-517 (average 497) \x long. Prothorax. Pronotal ridge strong, but medially interrupted by weak sclerotization. Lateral pronotal sclerites medium-sized, without setae. Medial pronotal setae : 2 small , situated close together on the median line. Post-tergites very small and weakly sclerotized, without striations and without setae. Pleural structures typical of family. Sternum with strong transverse ridge, median ridge reduced to a basal stalk or sometimes absent, and a triangular sclerite. Anteprosternal setae absent ; prosternal setae : occasionally one present. Mesothorax. Mesoprephragma with shallow emargination. Prescutum about twice as wide as long (average 145 and 74 \l respectively) ; anterior margin curved ; laterally bounded by the prescutal ridges and posterio
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