APPENDIX. 367 



probability is, tbat at least 5 or 6 differ greatly in points that in other groups of 

 insects are dwelt upon almost with mathematical nicety, e. g\-the structure of 

 the mandibles, which, in L. Cervus (exclusively of other important distinctions 

 in the dentation) in their most developed state, have the apex strongly furcate, 

 the notch between the forks being very deep, while the same part is not only 

 obtuse in the extreme case, but the centre is absolutely more prominent than the 

 sides, whence we have a depression in place of an elevation, than which nothing 

 can be more diametrically opposite : — thus it is with Necrodes littoralis, an insect, 

 in its most developed state, exhibiting in the male highly incrassated and 

 dentate posterior femora, incurved hinder tibiae, dilated anterior and intermediate 

 tarsi, various strongly sculptured impressions on the thorax, elevated elongate 

 costae on the elytra, &c, while, in the opposite case, the posterior femora are 

 slender and simple, the hinder tibiae straight, the intermediate tarsi less de- 

 veloped than the anterior, the sculpture on the thorax different, the costae on the 

 elytra abbreviated, and, in fine, every character less evident than in the larger 

 individuals; but in the extensive series of the insect which I possess every 

 intermediate shade is to be found, so that if there be two species, it would neces- 

 sarily follow that the intermediate examples could belong to neither, and must 

 consequently form a third; added to which fact, it may be stated that no females 

 have yet been found to associate with such undeveloped (if so they may be 

 termed) males, although ordinarily equally abundant with the opposite sex, 

 a circumstance perfectly inexplicable when it is stated that the males of the so- 

 called second species have been captured in Scotland, Norfolk, Kent, Devon- 

 shire, Surrey, South Wales, &c, were not the inference manifest that the alleged 

 species was a mere variety of the male, a parallel case with that of L. Cervus, 

 the small varieties of which remain in our cabinets in a state of celibacy. 



Page 22. Oiceoptoma thoracica. " Baron- wood, Armathwait, &c." — T. C. 

 Hey sham, Esq. " Common in Notts."— Dr. Howitt. " Meldon-park, Wit- 

 ton-le-wear, &c." — G. Wailes, Esq. 



Page 22. Oiceoptoma rugosa. "Common in Nottinghamshire." — Dr. Howitt. 



" Newcastle, &c, abundant." — G. Wailes, Esq. 

 Page 23. Oiceoptoma sinuata. " Common in Notts." — Dr. Howitt. " Prest- 



wick Car." — G. Wailes, Esq. 



Page 23. Oiceoptoma dispar. ' ' Caernarvon, N. Wales, N. W. Hockin, Esq." 

 — C. C. Babington, Esq. 



Page 24. Silpha 4-punctata. " Kensington-gardens." — A. Cooper, Esq. 

 " Baron-wood and Crosby-upon-Eden." — T. C. Heysham, Esq. 



Page 25. Silpha obscura. " Nottingham-forest, very local." — Dr. Howitt. 

 " Summit of Skiddaw, in company with Leistus montanus and Helobia Mar- 

 shallana." — G. Wailes, Esq. " Cambridge."— C. C. Babington, Esq. 



Page 25. Sii.pha tristis. "Has once occurred in Notts." — Dr. Howitt. "Mel- 

 don Park." — G. Wailes, Esq. 



Page 26. Silpha nigrita. " Extremely common throughout the county of 

 Notts." — Dr. Hoivitt. " Newcastle, &c. ; very abundant."— G. Wailes, Esq. 



