With Homer, you can still appreciate the Iliad and the Odyssey in English -- indeed, the recent translations of Robert Fagles capture the movement and energy of Homeric verse quite well. With Theocritus, however, a translation is a wretched substitute for the Greek, since the exquisitely refined beauty and charm of his poems simply cannot be reproduced in English. What makes Theocritus such an enjoyable experience in Greek is the Doric dialectic in which he writes, his manipulation of the hexameter verse (the same 6 beat verse used by Homer), the echoes of Homer and other authors, and similar curiosities.
Theocritus wrote in the 3d century BC, during the so-called Hellenistic period which arose after the demise of the classical Greek city-state. This era was, in many respects, the first "modern" world. Theocritus was a Sicilian who wrote around 270 BC. He was highly original -- he invented pastoral or "bucolic" poetry, a genre which had a very long and distinguished run in subsequent Latin and European literature. Appearing in the works of this poet for the first time are the cowherds, goatherds, and shepherds playing the pan pipes under the shade of spreading trees, bantering with each other as they sing their rustic songs. If you wish to appreciate Vergil's Eclogues, Spenser's Shepheard's Calendar, or Milton's Lycidas, to name a few of the more well known examples of the form in later literature, you must at least have a taste of the master who invented this important genre.
In this Penguin paperback edition, Robert Wells offers up straightforward, readable translations of the 22 "Idylls" (meaning "short sketches") which are commonly attributed by scholars to Theocritus. Accompanying the translations is an excellent 52 page Introduction which provides the general reader with important background information about the poet, his art, his era, and his compositional techniques.
WARNING!!! The poems of Theocritus are not intended for poorly educated or unsophisticated readers. Do not attempt to read these poems if you lack imagination, curiosity, and an appreciation for the delicate craftsmanship of a sensitive and learned poet