It is not usual for young entomologists to have much to do with the 'Micros' until they have had a little practical experience with the larger species; in fact, a good number of them never seem to extend their knowledge beyond the limits of the 'Macros' except that they may make an occasional capture of a Micro that happens to fly across their path. Now, since it would be practically impossible to deal fairly, even in outline, with both these divisions of the _Lepidoptera_ in a work of the present dimensions, I have devoted most space to the larger species so as to meet the probable requirements of the majority of my readers. But in order that the beginner may also have the means of introducing himself intelligently to a study of the 'Micros,' I shall set apart this chapter for a simple account of the broad principles of their classification, illustrated by means of a few types, so that the collector may at least know _something_ of the insects he captures, even though he may not be able at once to fix on their names. The young entomologist, thus provided with the broad features that enable him to roughly classify the specimens which reach his cabinet, may, as his store increases, pay an occasional visit to a public museum or the private collection of an entomological friend, and so obtain the names and other details he may require. The _Micro-lepidoptera_ are divided into five main groups--_Pyralides_, _Pterophori_, _Crambi_, _Tortrices_, and _Tineae_, each of which is divided into families and genera, as we have seen in the case of the 'Macros.' _Pyralides_ The _Pyralides_ may be easily distinguished by the proportionately long fore wings, long legs, and elongated abdomen. Some of them have wings of a pearly lustre, and are accordingly known popularly as the 'Pearls.' Some species fly in bright sunshine, others appear on the wing before sunset, and fly till dusk; others, again, are purely nocturnal in their habits. All, however, are apparently light sleepers, and may be easily beaten out of their resting places and netted by day. Some of these moths are common everywhere, but the majority of them are very local, though they may be extremely abundant where they occur. The larvae have a glossy and bristly appearance, and are generally gregarious in their habits. This group contains about eighty species, arranged in five families as follows: 1. _Pyralididae_, including about forty species. 2. _Botydae_, about thirty species. 3. _Steniiadae_, containing only five species. 4. _Hydrocampidae_, four species. 5. _Acentropodidae_, containing only one. _The Tabby_ (_Aglossa pinguinalis_) The first of these families contains the Tabby or Grease Moth, commonly met with both in the larval and perfect states in barns and stables. [Illustration: FIG. 209.--THE TABBY OR GREASE MOTH.]