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By Stephen P. Hopkin

This entire paintings is the 1st single-volume publication of the 20 th century to study the biology of this significant crew of bugs, together with a whole record of Collembola genera including greater than 2,500 references in addition to the discussions of springtail habit, body structure and evolution.

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Order JULIDA (p . 96) • Nemasoma varicorne (p. 102) , Proteroiulus fuscus (p. 107) and Brachyiulus pusil/us (p. 183) may mature with fewer than 30 rings (see p . 96) . 52 Subclass PENICILLATA Order P O L Y X E N I D A The bristly millipedes stand apart from all other millipedes in certain funda­ mental respects . The order Polyxenida is accordingly placed in a separate sub-class of the Diplopoda , the PENICILLATA ( PSELAPHOGNATHA) in antithesis to the remaining diplopods of the sub-class Chilognatha.

Order CHORDEUMA TIDA (p . 68) . . . . . . . . . . . . . . . . . suborder CRASPEDOSO MATI DEA (p . 7 1 ) 6. Always with ocelli (except stadium I) ; coll um not overlapping the head ; cheeks laterally protuberant , not obviously divided into cardines and stipetes ; no longitudinal striae or other sculpture on the ring ; three pairs of setae on metazonites (Fig . 28) . Adults with 28 or 30 rings ( telson included) , females with 45 or 49 pairs of legs , males with 41 or 45 pairs ; all young stadia except I and II with an even number of pairs .

3 4 3. Twelve tergites , including telson (fewer in young stadia) ; second tergite (shield) much longer than the collum and following tergites ; capable of enrolling into a sphere (Figs . 15-17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pill millipedes, GLOMERIDA (p . 56) Adults with more than 30 tergites ; pointed head (Fig. 1 8) rare species from South-east England . . . . . . . . . . . . . . . . . . . . . . . . .

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