INSECTS. 



VI. DIPTERA, (from Sow, two, and cragoy.) Wings two, with 

 poisers m place of the posterior pair. 



VII. AFTER A, (from a, without , and crn^.) Destitute of 

 wings or elytra. 



Contemporary with Linnaeus was the celebrated Reaumur, 

 whose Memoires pour rHistoire des Insectes will long remain 

 a splendid monument of philosophical sagacity in devising, and 

 assiduity in watching the results of experiments. De Geer, 

 a Swedish nobleman, and also a contemporary, whose Memoires 

 pour servir a rHistoire des Insectes were published in seven 

 volumes 4to, from 1752 to 1778, is also one of the greatest 

 names in entomology. Numerous other writers in various de- 

 partments of the science appeared during this period, to give 

 even an enumeration of which would far exceed the bounds al- 

 lotted to this notice. Among these, however, it is necessary to 

 notice J. C. Fabricius, a pupil of Linnaeus, who proposed an 

 arrangement of insects founded upon their instruments of man- 

 ducation. De Geer had indeed in the majority of his classes 

 added the characters derived from the mouth to those afforded 

 by the wings ; but Fabricius carried the principle much farther, 

 and made the Trophi or Instrumenta Cibaria, as he termed 

 them, the basis of all his divisions. To the labours of Fabri- 

 cius entomology is deeply indebted ; for, independently alto- 

 gether of the merit of his arrangement as an artificial system, 

 it had the effect of directing the attention of his successors to 

 parts indicating a corresponding difference in the character and 

 structure of the animals. In the Supplement urn Entomologies 

 Systematicte, one of his latest general works, published in 1798, 

 Fabricius arranges the genuine insects into the following classes, 

 omitting those which are now considered as forming separate 

 groups. 



I. ELEUTHERATA. Maxillae naked, free, bearing palpi. 



II. ULONATA. Maxillae covered by an obtuse galea or 

 mouth-piece. 



III. SYXISTATA. Maxillae geniculated at the base, and con- 

 nected with the labium. 



IV. PIEZATA. Maxillae corneous, compressed, often elon- 

 gated. 



V. O DON AT A. Maxillae corneous, dentated. Palpi two. 



