His most notable collection contains a poem translated by Catullus called the (*) "Lock of Berenice.
One of this author's longer extant works is the poem Hecale, and he wrote a work cataloguing water deities called the Pegai Potamon. In the opening of this author's most famous work, Apollo tells the author to "make the flocks fat, but keep the muse slender," and this author's stance towards epic led a work entitled Ibis criticizing his student Apollonius of Rhodes. His most notable collection contains a poem translated by Catullus called the (*) "Lock of Berenice." For 10 points, identify this poet from Cyrene who worked at the Library of Alexandria and is known for his collection Aitia, translated as Causes. 
One of this author's longer extant works is the poem Hecale, and he wrote a work cataloguing water deities called the Pegai Potamon.
Callimachus