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XY. The Genera of Coleoptera studied, chronologically 

 (1802-21) . By G. R. Crotch, M.A. 



[Bead 6th June, 1870.] 



In this second portion of my task, embracing the period 

 of Latreille, I have departed somewhat from the method 

 of the first part [ante, p. 41) . The compression there 

 used was so great as to render reference a matter of 

 difficulty, and to obscure the results intended to be 

 arrived at. It has seemed advisable, therefore, at a 

 slight increase of space, to give each genus a separate 

 line, giving its type and synonym when required. Many 

 changes will be seen to be necessary if the types are 

 rigidly adhered to ; and every fresh investigation shows 

 me that no other principle will avoid ambiguity. The 

 number of genera proposed up to the period of Dejean^s 

 Catalogue was about 700, and nearly 150 new ones were 

 then established. From that point the advance was 

 rapid; and I should like in a third part to carry this 

 paper down to the commencement of the " Berichte" in 

 1836, from which point a continuous record of progress 

 already exists. 



YoET (Cat. Syst. Coleopt.) divides the Coleoptera into 

 sixty-six genera. I cannot see that anything justifies our 

 ignoring -these, which are well founded, and in advance of 

 his time. It can hardly be urged that his specific names 

 are bad, since we accept Geoffrey who had none.* The 

 greatest difficulty is that of obtaining the dates of the 

 various parts of his work published from 1766 to 1804. 

 It is, however, clear that the first twenty-two genera were 

 published before 1778. 



In the first volume he describes thirty genera. 



n. 3. C'OPES = Passalus, Fabr., 1793. 



4. \\SiLV'aA = Lucanus, Jjinn. 



5. PoLLiNCTOR = iVecrop/iorits, Fabr., 1775. 



8. CoFHioiDES = Sphceridium, Fabr., 1775. 



9. HiSTRio = Cistela , Geoff., Byrrhus, Fabr. 



* Again, if it be urged that he uses the names of others at random, as 

 Silpha for Lucanus, it needs only to glance at Linnaeus and Fabricius, to 

 see numerous blunders equally wilful. 



TRANS. BNT. SOC. 1870. PART III. (AUGUST.) R 



