XVI PREFACE. 



Before concluding this Preface, 1 take the oppor- 

 tunity of publicly thanking Dr. Horsfield for his 

 liberal views and kindness in forwarding this Ma- 

 nual. Whilst engaged in grouping the Families of 

 the ground beetles I was repeatedly at a loss where 

 to place several of Mr. MacLeay's genera, published 

 in the Annulosa Javanica ; by Dr. Horsfield's ready 

 attention to my wishes, I was enabled to examine 

 the rich collection in the India House, and had his 

 permission to figure those forms which, though pub- 

 lished, are little known to the Entomologists of the 

 Continent. Instead, however, of giving the generic 

 details here, I beg to refer the reader to the above 

 excellent work. The drawings were made by Mr. 

 Westwood, and are accurately engraved by Mr. 

 Swaine. I therefore trust that the plates will not 

 be the least interesting part of the present num- 

 ber, as they will tend to clear up many difficulties, 

 and give an increased value to the publication. 



F. W. H. 



Since my manuscripts were in the printer's hands, Monsieur Aube 

 has published a volume on Aquatic Coleoptera. Reference should 

 be made to that work, which is evidently a great improvement on 

 that of" the Baron De Jean's " Species General des Coleopteres." 



