In their own language they usually have only three numerals, viz.
The Arabic numerals indicate the segments of the legs.
The Roman numerals indicate the body somites and the two figures are adjusted for comparison.
In the bibliography at the close of this article (referred to by leaded arabic numerals in brackets throughout these pages), the titles of works are given which contain detailed information as to the genera and species of each order or sub-order, their geographical distribution and their habits and economy so far as they have been ascertained.
Other characteristic features are the use of the singular substantive after numerals, and adjectives of quantity, e.g.