23. Antennæ of Hydrellia griseola
24. Antennæ of Tichomyza fusca
25. Profile of Hydrellia griseola
26. Profile of Ochthera mantis
27. Wing of Borborus equinus
28. Wing of Limosina sylvatica
29. Section of a collector's net, showing 4
(a) the small end of a large net;
(b) a detachable muslin bag;
(c) elastic closing the bag;