E. sparrmannella (Bosc) Res.,1893-1980. Betula. Loc. f.c. and probably wdspd; mines more likely to be of this than the next species occur everywhere on birch. 88 *Hadleigh (FGW); Eastwood (Whittle. 1899a). E. salopiella (Staint.) Res., 1977-1980. Betula. Loc. and less c, than the last two species. VC 18. 49 Loughton; 50 Ongar Park Wood; 52 Birchanger; 69 Thorndon Park; 70 Pheasant -house Wood NR. VC 19. 02 Rowhedge; 12 *Weeleyhall Wood NR (AME). E. haworthi Bradley Res., (1899)-1980. Betula. Wdspd and c. *88 Hadleigh (Whittle, 1899a). E. sangii (Wood) Res., 1935-1980. Betula. Wdspd and f.c. *50 Ongar Park (SW). E. semipurpurella (Steph.) Res., 1890-1980. Betula. Wdspd and c. *69 Brentwood (CRNB) NEPTICULIDAE A large family which includes the smallest moths known to science. Some are unicolorous, but others have brilliant metallic markings, often in the form of a fascia across the forewing. They fly mostly at dawn and dusk and are seldom seen unless found by day resting on tree-trunks. Most of the larvae are leaf-miners and so much more conspicuous, but a few mine tender bark, buds or seeds. Many are exceedingly common and it has been calculated that in years of plenty up to a million larvae of Ectoedemia subbimaculella may feed simultaneously, and quite harmlessly, on a single oak-tree. As many as 123 mines of a related and local species, E. quinquella, were counted in a single oak-leaf. (Tutt, 1899:343). Of the 100 British species, 77 are recorded in Essex, where the family has been studied more fully than any other county. Two or three more species could possibly occur. 27