PREFACE. IX 



In a memoir, entitled " Revision of the Coccinellidae of 

 the United States," communicated by Mr Crotch to the 

 American Entomological Society, and published in its 

 Transactions, Vol. iv. p. 363 (April, 1873), it will be seen 

 that an inspection of the North American collections has 

 necessitated the establishment of no less than three new 

 genera, viz., Ceratomegilla, Crotch (having the fades of Rip- 

 podamia, but structurally more nearly allied to Megilla), type 

 G. Ulkei, Crotch, n. sp., — Hyperaspidius, Crotch (related to 

 Hyperaspis, but differing in having the elytral epipleurae 

 simple, i.e. destitute of foveas for the reception of the femora), 

 type trimaculata, Linn., — and Cephaloscymnus, Crotch (dis- 

 tinguished by its narrow transverse thorax with .immargi- 

 nate base, its large porrected head, etc.), type C. Zimmer- 

 manni, Crotch, and the description of eleven new species of 

 previously recognised genera, viz. Hippodamia oregonensis, 

 H. falcigera, II. americana, Coccinella dijficilis, C. annectens, 

 Mysia Hornii, Brachyacantha indubitabilis, B. Bollii, Hyper- 

 aspis dissoluta, H. Leiuisii, and H. Hornii: an investigation 

 also of the actual types of several North American species 

 involved certain modifications in nomenclature, which, un- 

 fortunately, could not be inserted and adopted in the present 

 work, owing to the portions in which they occurred having 

 been printed off long ere the advent of the memoir. 



EDWARD W. JANSON. 



London, 



31sf August, 1874. 



King's College, Cambridge, 

 August 31, 1874. 



My dear Sir, 



The whole expense of printing Mi* Crotch's 

 Revision of the Coccinellidw, which you have so kindly under- 

 taken to see through the press, has been borne by the 

 Syndics of the University Press; and I can only say, what 

 Mr Crotch would have said, that all thanks are due to them 

 for their liberality in the matter. 



c. b 



