1889.1 451 



shoulder. Elytra yellowish or greenish, with numerous fuscous mottlings. Wings 

 hyaline, with the veins fuscous. Posterior femora greenish-yeDow outside, with a 

 large dark blue patch inside, sometimes divided into two portions by a yellow band, 

 with a blue ring before the knee, separated from the large blue patch by a broad 

 yellow band. Posterior tibiae livid or yellowish, faintly blue at the apex. Sexes of 

 equal size. Length, 50 — 68 mm. 



By the characters given in the above table of species, migratorius, L., can easily 

 be distinguished from cinerascens, Fab. The difference in the form of the pronotum 

 is striking, and while in migratorius the posterior tibiae are livid or inclined to 

 yellow, in cinerascens they are always more or less red. The form of the small 

 ridges on the vertex also makes a good distinctive character, but they are sometimes 

 very obscure. There also seem to be some differences in the structure of the 

 subgenital lamina of $ , but of these I have not availed myself now, not having 

 a large enough number of specimens at my disposal: 



Though neither of these species, in all probability, breeds in this country, 

 their frequent occurrence and wide range when they visit us, give them a right to a 

 place in our fauna lists. Most of the specimens I have seen are migratorius, and my 

 two came from the Southern Counties ; but of the " locusts " whioh occurred in some 

 numbers in Yorkshire in 1876, Mr. R. McLachlan identified the specimens which 

 were sent to him as cinerascens, Fab. (Ent. Mo. Mag., 1877, xiii, 180). Two of 

 these specimens I have lately had the opportunity of examining through the kind- 

 ness of Messrs. Roebuck and Waite of Leeds. One of them is undoubtedly cine- 

 rascens, Fab., $ , captured at Spurn ; but the other (a $ ) taken in Leeds ought, I 

 think, to be referred to migratorius, L. In 1886 Mr. Wallis Kew sent me for 

 identification a migratorius $ from Withern in Lincolnshire. Mr. E. Saunders has 

 migratorius from Child's Hill, Hampstead, and Hastings, and of two specimens of 

 Pachytylus recently sent to me by Rev. E. N. Bloomfield, one was migratorius, L., 

 and the other cinerascens, F., ? , a very large specimen, with elytra 62 mm. long ; 

 these were taken at Fairlight, Hastings. 



In an interesting paper, entitled, " Locusts in Yorkshire," read before the 

 Huddersfield Scientific Club, February, 1877, and published in " The Naturalist " 

 (New Series, ii, 1876—7, pp. 129—137, and 145—150), Mr. W. Denison Roebuck 

 collected the older records of the occurrences of these species, together with a full 

 account of those captured in 1876. 



According to Brainier, cinerascens is the more wideJy distributed 



species, and in Europe is most plentiful in the south-west and along 



the Mediterranean Sea, while migratorius occurs chiefly in the east. 



Baron de Selys-Longchamps states that cinerascens breeds regularly 



in Belgium, and was of opinion that it also did so in Britain, but I 



cannot agree with him in this. 



2. — Pachytylus cinebascens, Fab. 

 Gryllus cinerascens, Fab., Ent. Syst., ii, p. 59. 

 Pachytylus cinerascens, Eisch., Orth. Eur., p. 395, tab. xviii, figs. 13, 



13a-e; Brunner, Prod, der Eur. Orth., p. 172. 

 Oryl. {Locusta) danicus, Linne, Syst. Nat., ed. xii, i, 2, p. 702. 

 Locusta Christii, Curtis, Brit. Ent., pi. 608. 



