A HISTORY OF NORFOLK CHILOPODA Centipedes LITHOBIID^ 1. Lithobius forficatus, Linn. Syst. Nat., ed. lO p. 638 (1758). Norfolk Broads. 2. Lithohius calcaratus, C. Koch. Die Myr.-Gatt. Lithobius, p. 86 (1862). West Runton and Ormesby Broads. A much smaller and darker species than the preceding, and characterized by the anal legs of the male having the fourth segment swollen and tubercular. DIPLOPODA Millipedes POLYDESMIDiE Millipedes in which the body, when adult, consists of only nineteen or twenty segments, most of which, at least in all the typical genera, are provided with a pair of lateral plates or keels bearing the repugnatorial pores. Two species only have been captured in Norfolk. 3. Polydesmus complanatus, Linn. Faun. Suede, ed. 2 p. 502 (1761). Norfolk Broads. 4. Brachydesmus superus, Latzel. Die Myr., etc., ii. p. 1 30 (1884). Norfolk Broads. The genus Brachydesmus, of which but one British species is known, differs from Polydesmus in having nineteen instead of twenty body-segments. CHORDEUMIDiE Millipedes with thirty or thirty-two body-segments furnished dorsally with six symmetri- cally disposed bristles, without repugnatorial pores and usually keeled like those of the Polydesmidx. 5. Atractosoma polydesmoides. Leach. Tool. Misc., iii. p. 36 (18 1 7). Norfolk Broads. This species, with its large keels, closely resembles an elongate Polydesmus. lULID^ Cylindrical millipedes with a large but variable number of body-segments, furnished with repugnatorial pores, but without large lateral plates. 6. lulus sabulosus, Linn. Syst. Nat., ed. 10 p. 639 (1758). West Runton. This handsome species may be recognized by its large size and the presence of a pair of longitudinal yellow bands running down the back. 7. lulus niger. Leach. Zool. Misc., iii. p. 34 (1817). West Runton. As large as the preceding, but uniformly black and with the anterior portion of the body- segments transversely grooved. 8. lulus punctatus, Leach. Zool. Misc., iii. p. 34 (18 17). Norfolk Broads. Smaller than the two preceding species and paler coloured, with caudal process bluntly rounded at the tip. Found in rotten wood. 172
