ENTOMOLOGICAL CABINET. 



CALEPTERYX LUDOVICIANA. Leach. 

 Libellula Virgo. Linnc. 



Blue to a silky green : head large, broader than 

 long, with the stemmata placed in the form of a 

 triangle near the summit of the head : the mouth 

 is large and furnished with strong and powerful 

 jaws : the eyes are placed far distant from each 

 other, large and hemispherical, in the dead speci- 

 mens of a dingy brown ; the hexagons are very nu- 

 merous, amounting to many thousands, and form a 

 most delightful object for the microscope : antennae 

 short, placed between the eyes, the basal joints stout 

 and terminating in a hair : thorax broad at the base, 

 much elevated behind, but narrower and a deep line 

 down the centre : wings of a deep blue, brownish 

 towards the apex : body cylindrical, with the first 

 six segments nearly of equal length, the seventh, 

 eighth and ninth gradually shortening ; above of a 

 rich silky-green, beneath bluish-black : legs blue- 

 black and furnished with fine and long spines. 



Length of the body 2 inches, expansion of the 

 wings 2f inches. 



Inhabits the banks of rivers and running streams 

 in June. 



This very beautiful species of Dragon-fly is by no 

 means uncommon on the banks of the Lea and other 

 Rivers, 



20-4 



