50 
DR ALFRED E. CAMERON. 
season. For any given locality the same changes in the same order occur year after 
year. It may merely be a succession of the various life-history stages of the indi- 
vidual species. Every collector and ecologist knows that many insects are only to 
be found on the wing for a certain, well-defined period of each year. 
Apterygota. 
It has not been considered necessary to draw up a detailed table of the various 
species of the Apterygota. In the first place, their numbers were comparatively few, 
and in the second, their habits are probably all alike, viz. : humus-feeders requiring 
fairly moist conditions. The following occurred : — 
Entomobrya nivalis , L. 
Entomobrya albocincta, Tempi. 
* Lepidocyrtus curvicollis, Bourl. 
*Orchesella cincta, Lubb. 
* Dicyrtomina ornata, Lubb. 
Campodea staphylinus, Westw. 
Onychiurus jimetarius, L. 
Onychiurus ambulans, L. 
Isotoma viridis, Bourl. 
Isotoma grisea, Lubb. 
*Tomocerus tridentiferus, Tullb. 
The species marked # were found mostly among dead leaves on the boundary of 
Glover’s Meadow near the wood (PI. II, fig. 2), and in similar situations in the 
Alluvial Pasture (PI. II, fig. l). They are probably characteristic of forest floors. 
The remaining species occurred at the roots of grasses. 
Plectoptera, Neuroptera, Mecaptera, Trichoptera. 
Of the various species (Table VIII) only Chrysopa vulgaris and C. perla belong 
to the association. The others, except Panorpa communis , are members of aquatic 
communities. Only the proximity of their habitats, neighbouring ponds and the 
River Dane, will account for the occurrence of the adult forms in grassland. They 
were taken very frequently when attracted by artificial light. The larva of P. 
communis is a soil inhabitant generally found in moist, wooded areas. The male 
of the species possesses a curious clasping organ near the anus. 
Diptera. 
This order (Tables I, II, III) is especially well represented in grassland. In our 
particular locality the various species are referable to several distinct classes, chief 
among which are : — 
1. Those peculiar to grassland and consisting mostly of species, the larvae of 
which are predaceous either in the soil or other vertical strata, or truly 
phytophagous, depending chiefly for their subsistence upon grassland plants 
and weeds (Table I). 
2. Those the larvae of which are coprophilous or subsist on decaying animal or vege- 
table tissue. The imagines have generally the same habits or frequent flowers. 
Some may become pests of cultivated crops, e.g. Diloplius, Bibio (Table II). 
