Mr. J. Walton on the Genus Apion. 445 



examined the whole group, and having additional materials 

 for forming just conclusions on various points connected with 

 them, I have thought a new list with such observations as have 

 occurred might be acceptable to entomologists. In connexion 

 with the synonyms it is necessary to observe, that the names 

 of Marsham are quoted in the following pages on the authority 

 of the Bev. Mr. Kirby, whilst those of the last-mentioned author 

 are given from my own examination of the original specimens 

 contained in the Kirbian collection. For the names and syno- 

 nyms of M. Schonherr and Dr. Germar I have the authority of 

 those two authors except where otherwise stated ; an interchange 

 of specimens has, however, in many cases enabled me to form an 

 independent opinion. 



Mr. Kirby and other subsequent writers state that the clava 

 of the antenna of the insects of this genus has only three joints, 

 when in fact it consists of four ; when mounted in Canada bal- 

 sam, covered with thin glass, and viewed as an opake object, by 

 means of a Lieberkuhn, with a power of 160 linear, the clava will 

 be distinctly seen to be quadriarticulate, the apical joint being 

 minute, so that the antenna is composed of twelve articulations. 

 I have examined the rostrum of many species of this genus, and it 

 appears that it has on the under side two deep antennal grooves, 

 converging from the points of insertion of the antennse, and 

 uniting beneath the eyes ; these grooves are divided towards the 

 base by a narrow ridge, and their use is to receive and protect the 

 basal joints of the antennse. None of the British species described 

 with the antennse basal have the points of insertion strictly at 

 the base, but all have them at a greater or less distance from it, 

 and have the antennal grooves very deep and of the form of a V ; 

 in the first three species in which the rostrum is subulate, the 

 antennal grooves are united beneath at the base, and form a broad, 

 very deep, elongate furrow, which extends through the whole of 

 the under side of the head. 



Besides the works quoted in my first communication, I shall 

 here have occasion to refer to the following : — 



Herbst. Natursystem aller bekannten in- imd auslandischen Insecten, &c., 

 von C. G. Jablonsky, Berlin, vii. 1797. 8vo. 



Kirh. Kirby on Herbst's genus Apion in the Transactions of the Linnsean 

 Society, vol. ix. 1808; vol. x. 1811. 



Germ. Magazin der Entomologie, von E. F. Germar, vol. ii. 1817; and 

 (App.) vol. iii. 1818. 



Germ. Germar in Entomologische Zeitung, Stettin, No. ], Januar 1842, 

 and No. 5, Mai 1842. 



Steph. Systematic Catalogue of British Insects, by J. F. Stephens. 8vo. 

 1829. 



