Dogday cicada

from The Collaborative International Dictionary of English v.0.48

Dog day \Dog" day`\ or Dogday \Dog"day`\
   One of the dog days.
   [1913 Webster]

   {Dogday cicada} (Zool.), a large American cicada ({Cicada
      pruinosa}), which trills loudly in midsummer.
      [1913 Webster] Dog days

from The Collaborative International Dictionary of English v.0.48

Cicada \Ci*ca"da\ (s[i^]*k[=a]"d[.a]), n.; pl. E. {Cicadas}
   (-d[.a]z), L. {Cicad[ae]} (-d[=e]). [L.] (Zool.)
   Any species of the genus {Cicada} or of the family
   {Cicadidae}. They are large hemipterous insects, with nearly
   transparent wings. The male makes a shrill sound by peculiar
   organs in the under side of the abdomen, consisting of a pair
   of stretched membranes, acted upon by powerful muscles. A
   noted American species ({Cicada septendecim}) is called the
   {seventeen year locust}. Another common species is the
   {dogday cicada}.

   Syn: cicala. [1913 Webster]