. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 4. Spicular apparatus of species of Ther;stus flevensis group. a—T. ombronensis (after Gerlach, 1951); b—T. flevensis (after Gerlacfi, 1951); c—T. bipunctatus (after Skwarra, 1924); d—T. macroflevensis (after Gerlach, 1953); e—r. borosi (after Andrassy, 1958); f—T. parambronensis (after Timm, 1952); g—T. metaflevensis (after Gerlacfi, 1955); fi—same species, present material; i—T. calx (present material). Text-fig. 4) immediately separates T. horosi and T. calx from all other species. As for the remaining speci
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 4. Spicular apparatus of species of Ther;stus flevensis group. a—T. ombronensis (after Gerlach, 1951); b—T. flevensis (after Gerlacfi, 1951); c—T. bipunctatus (after Skwarra, 1924); d—T. macroflevensis (after Gerlach, 1953); e—r. borosi (after Andrassy, 1958); f—T. parambronensis (after Timm, 1952); g—T. metaflevensis (after Gerlacfi, 1955); fi—same species, present material; i—T. calx (present material). Text-fig. 4) immediately separates T. horosi and T. calx from all other species. As for the remaining species, it could be argued that T. flevensis, T. ambronensis, and T. bipunctatus represent three subspecies of T. flevensis, characterized by the position of the vulva (65-72%), the more posterior position of the amphids, and the slight subterminal protuberance at the inner edge of the gubernacular hook (shown by Gerlach in 1951, but not in 1957). On the other hand, T. metaflevensis and T. parambronen- sis have the vulva at 83-877^ and the guber- naculum ends distally either in a triangular plate or a smooth hook. However, the latter species is insufficiently described and the figure of the spicular apparatus is obviously rather stylized. T. macroflevensis is said to be characterized mainly by the long somatic setae. In other respects it links the flevensis-group with metaflevensis and parambronensis. We have identified our second species with T. metaflevensis although we saw the gubernaculum to be slightly different from that described by Gerlach and found only one lateral seta instead of three. It is im- possible at this time to judge the systematic value of these differences. metaflevensis Ger- Therisfus iPenzancia] lach, 1955 Plate XXXIII, fig. 73 Theristus (Peuzducia) metaflevensis Gerlach, 1955: 291-293, fig. 25, a-tl L = 2 , , S , mm; w = 34-40 fx- esophagus = 230-275 /x; Vu = 83%. Head diameter 2 , 19, S , 26 /i. Cephalic setae 9 /x in female, 14 +
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