. Bulletin of the Natural History Museum Zoology. . Fig. 20 Statistical analysis often series of Simocephalus s. str. from East Siberia and Far East. 1—7-5. vetuloides, 8-10-5. , result of cluster analysis, B, C, diagrams of characters. China (Stingelin, 1904), India (Biswas, 1971), Niger (Dumont & Van De Velde, 1977a), Nepal (Dumont & Van De Velde, 1977b), Central Asia (Manujlova, 1964). But judging from illustrations, these authors had specimens not of S. elizabethae but of S. mixtus. Remarks. The original description (King, 1853a) contains the characters of two species. The
. Bulletin of the Natural History Museum Zoology. . Fig. 20 Statistical analysis often series of Simocephalus s. str. from East Siberia and Far East. 1—7-5. vetuloides, 8-10-5. , result of cluster analysis, B, C, diagrams of characters. China (Stingelin, 1904), India (Biswas, 1971), Niger (Dumont & Van De Velde, 1977a), Nepal (Dumont & Van De Velde, 1977b), Central Asia (Manujlova, 1964). But judging from illustrations, these authors had specimens not of S. elizabethae but of S. mixtus. Remarks. The original description (King, 1853a) contains the characters of two species. The first adequate description of this species was made by Sars (1888). Schodler (1877) and Negrea (1983) suppose S. elizabethae to be a synonym of S. vetulus. Dumont (1983) regards it as a subspecies of S. vetulus. I believe 5. elizabethae to be a separate species, because it differs from S. vetulus in the shape of the ventral head margin and dorso-posterior valve prominence. These differences are not less than the differences between other species within this subgenus. Judging from the original description (Smith, 1909), the Tasma- nian species S. dulvertonensis belongs to Simocephalus . Information about the type material is lacking. Available specimens from Tasmania differ slightly from Australian material in the shape of the dorso-posterior valve prominence, but this difference is insufficient to assign them to a separate species or subspecies. I agree with Brehm (1953) and Dumont (1983), that S. dulvertonensis is a synonym of S. elizabethae. Subgenus S. (Echinocaudus) subgen. nov. TYPE SPECIES. Simocephalus exspinosus (De Geer, 1778). Diagnosis. Both sexes (Figs 28; 29). Frons rounded or pointed, without denticles. Head shield without depression. Head pores present. Insertion of antennules at base of rostrum. Antennule long or short in correspondence with long or short rostrum, with neither ridges nor denticles on inner side. Aesthetes longer than base of antennule. P
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