BET. T. A. MARSHALL — CORTNODINORUM RECENSIO. 25 



them to deal witli a small subfamily of the Eumolpidse, at once 

 singularly beautiful in form, and singularly difficult from the simi- 

 larity of their structure. The former consideration will explain 

 why they were willingly selected as the subject of study, the 

 latter why the results of that study have been so long delayed. 

 The pleasure of the hours that I have spent in the work I owe to 

 the kindness of my friend the Rev. Hamlet Clark, who not only 

 placed at my entire disposal the whole of his rich coUection, but 

 has incessantly laboured, and not without success, to inspire me 

 with a portion of his own ardour for the study of the Phytophaga. 

 Mr. Clark's collection comprises nearly every described form 

 (so far as I have been enabled to discover them) of the present 

 limited subfamily, and, besides these, a great number of novelties 

 which it is the object of the following pages to describe. I ought 

 to add that, in selecting this section of the Eumolpidse (the genera 

 Corynodes, Chrysochus, and their affinities) as the first subject for 

 publication, I was much influenced by the kind suggestion of 

 J. S. Baly, Esq., of Kentish Town, that I should turn my atten- 

 tion to these special forms. I willingly concurred in his views, 

 and began at once to devote some leisure time to the subject 

 which he had been good enough to mark out for me. I did so 

 the more readily as that gentleman has himself published excel- 

 lent papers on the Eumolpidse, and common courtesy (which 

 debars every student from intruding willingly upon the labours 

 of others) demanded the selection of a group far removed from 

 the present sphere of his occupation. Fortunately, or unfor- 

 tunately (according to taste), the unoccupied ground is so exten- 

 sive, that a dozen or more entomologists might well enter upon 

 separate allotments, without much fear of committing a trespass 

 upon their neighbours'. 



On the CoRTiTODiNA, a Subfamily of the EuMOLPiDiE. 



The two genera Gorynodes and Chrysochus, as they now stand 

 in collections, comprise one of the most strongly marked, as well 

 as one of the most beautiful subfamilies of the Eumolpidse. The 

 characters presented by the large flattened club of the antennse, 

 the cylindrical thorax, and the vertical head, invisible from above, 

 are such as immediately strike the eye ; while the splendid hues 

 which adorn the species, as well as the interesting considerations 

 arising from their geographical distribution, cannot fail in a lively 

 manner to impress the imagination. 



The number of species is now considerable ; and as they present 



