[1] : The Collaborative International Dictionary of English v.0.48

june bug \june" bug`\, n. zool.
   1. see june beetle.
      pjc

   2. a firefly. chiefly northern u. s.
      pjc
see also:
june beetle firefly 

[2] : The Collaborative International Dictionary of English v.0.48

june \june\, n. l. junius: cf. f. juin. so called either from
   junius, the name of a roman gens, or from juno, the goddess.
   the sixth month of the year, containing thirty days.
   1913 webster

         and what is so rare as a day in june?
         then, if ever, come perfect days.        --lowell.
   1913 webster

   june beetle, june bug zool., any one of several species
      of large brown beetles of the genus lachnosterna and
      related genera; -- so called because they begin to fly, in
      the northern united states, about the first of june. the
      larvae of the june beetles live under ground, and feed
      upon the roots of grasses and other plants. called also
      may bug or may beetle.

   june grass bot., a new england name for kentucky blue
      grass. see blue glass, and illustration in appendix.
      1913 webster
see also:
june beetle june bug lachnosterna may bug may beetle june grass 
blue glass 

[3] : The Collaborative International Dictionary of English v.0.48

dor \dor\, n. cf. as. dora drone, locust, d. tor beetle, l.
   taurus a kind of beetle. cf. dormouse. zool.
   a large european scaraboid beetle geotrupes stercorarius,
   which makes a droning noise while flying. the name is also
   applied to allied american species, as the june bug. called
   also dorr, dorbeetle, or dorrbeetle, dorbug,
   dorrfly, and buzzard clock.
   1913 webster
see also:
dormouse geotrupes stercorarius june bug dorr dorbeetle dorrbeetle 
dorbug dorrfly buzzard clock 

[4] : WordNet (r) 2.0

june bug
     n : any of various large usually brown north american
         leaf-eating beetles common in late spring; the larvae
         feed on roots of grasses etc. syn: june beetle, may
         bug, may beetle
see also:
june beetle may bug may beetle 

Bug >> B Words
Bug, definition of term: Bug
bug_pag1.html

June >> J Words
June, definition of term: June
june_pag1.html

Bug Out >> B Words
Bug Out, definition of term: Bug Out
bug+out_pag1.html

Bed Bug >> B Words
Bed Bug, definition of term: Bed Bug
bed+bug_pag1.html

Chinch Bug >> C Words
Chinch Bug, definition of term: Chinch Bug
chinch+bug_pag1.html