12 NOTES UPON THE GENERA SITONA, &C. 



identified the sexes. The males of both species {A. Ervi and 

 A. Vlcki) have the hair on the body thicker, the rostrum shorter, 

 fihform, pubescent from the base to the tip, and the antennae 

 are seated near its middle, and are entirely testaceous. The 

 females of both species are less hairy on their bodies, the ros- 

 trum longer, attenuated before the antennae, glabrous and shin- 

 ing ; the antennas seated nearer the base of the rostrum, with 

 their clubs black, and their basal joints rufous. Both species 

 are very plentiful about Knaresboro', in Yorkshire. Of these 

 two species, so analogous to each other in their sexual charac- 

 ters, I beg to refer to a series of both sexes, placed by me in a 

 spare drawer at the Entomological Society, and also to Mr. 

 Kirby's insects themselves, in support of my opinion. If sexual 

 characters are allowed to predominate in separating species, 

 and the act of taking and observing them in copula be of no 

 weight in support of well developed sexual characters, then 

 A. ruficorne, A. Lathyri^ A. Maharum, A. foveolatum, A. mar- 

 chicum, A. unicolor must all stand, and A. Pomonct\ A. Vicice, 

 A. Vorax, and numerous others, must be doubled. 



No. 16, A. Maharum, Q.x\di No. 17, A. rufirostre. Mr. Kirby 

 has confounded the sexes with each other. The late lamented 

 Dr. Leach took these insects in coitu, the former name is there- 

 fore dropped with universal consent. No. 21, A. Fagi, is an 

 immature male, of the A. flavi-femoratiim of Kirby. No. 23, 

 A. flavi-femoratum, var. j3 (cestivuni) is a distinct species, and 

 var. 7 {paripes) the same. 



A. No. 27, is A. foveolatum^ var. j3, y. A. No. 37, is A. 

 Spenc'ii, 37 inas. and fern. 



Having taken many of this species (for the two are male and 

 female) in different localities, near Knaresboro', in July 1836, 

 and not being able satisfactorily to name them by Mr. 

 Stephens's illustrations, I compared them when I was in 

 London, the latter end of July, with the above in Mr. Kirby's 

 collection. Mr. Waterhouse was present, and agreed with me, 

 that the two species and their varieties, given as distinct, were 

 alike, and the same as mine, excepting one insect, with Mr. 

 Kirby's original number, 27, attached to it : that is to say, he 

 thought the A. foveolatum, different from the varieties j3 y, from 

 A.Spencii, 37 mas. dind-fem., and also from all mine. On my return 

 home into Yorkshire, the beginning of August, I went to 

 Scarboro' : in a ravine or dell, just beyond the White Nab, 



