_Family 36, Hippoboscidæ._--The most familiar insects comprised in this family are known as "Forest Flies." The common Forest Fly (_Hippobosca equina_) is a brown species about one-third of an inch in length, and exceedingly annoying to horses, particularly in the New Forest. The Sheep Tick (_Melophagus ovinus_) is another well-known example. [Illustration: Fig. 154.--Oscinis Cornuta (Mag.)] _Family 37, Nycteribidæ._--These insects are all parasitic on bats, and are commonly known as "Bat Lice." They are wingless, but have a pair of halteres placed upon the dorsal surface. [Illustration: Fig. 155.--Phora Camariana (Mag.)] _Family 38, Braulidæ._--This family includes only a single species, which is parasitic upon the honey bee. Its name is _Braula cæca_, and it is an exceedingly minute creature. TRIBE IV.--APHANIPTERA. The tribe _Aphaniptera_ was formerly considered to be a separate order, but it is now generally included among the _Diptera_ on account of the similarity in the transformations besides other considerations. There is only one family. _Family 39, Pulicidæ._--To this family belongs the numerous species of fleas which infest different kinds of animals. The Human Flea (_Pulex irritans_) is familiar to every one. It gets its living by sucking our blood, and is of great annoyance, particularly in hot weather. The blisters which it raises on various parts of the body are exceedingly irritating. [Illustration: Fig. 156.--Pulex Irritans (Mag.)] The Dog Flea (_Pulex canis_) and the Cat Flea (_Pulex felis_) are distinct from the above, and are chiefly confined to those animals, although they do not disdain to vary their diet occasionally with human blood. The Jigger or Chigoe (_Sarcopsylla penetrans_) is abundant in the West Indies and in South America. It is sometimes very annoying to travellers, burrowing deeply under the skin. The body of the female is capable of attaining to the dimensions of a pea. * * * * * Printed by Hazell, Watson, & Viney, Ld., London and Aylesbury. * * * * * =COINS= _AND_ =MEDALS= Bought, Sold, Valued or Exchanged. =SPINK & SON=, THE OLDEST-ESTABLISHED =Dealers in Coins & Medals=, =17 & 18 PICCADILLY, W., AND 1 & 2 GRACECHURCH STREET, E.C., LONDON=, Beg respectfully to announce that they =PURCHASE OR VALUE= COLLECTIONS OR SINGLE SPECIMENS OF =Gold and Silver Coins and Medals=, _PROOFS, PATTERNS, ETC._, ALSO =NUMISMATIC BOOKS CABINETS, ETC.=, For which they can give the Highest Obtainable Cash Prices.