408 



CRUSTACEOLOGY. 



tii j. 



Crustacea, the segments laterally produced, bearing little spines ; 

 "** "V"""' back with one longitudinal groove ; each segment with 

 two slight tubercles on the sides of the groove. 

 Ju'us nolydesmoides, Montagu's MSS. 

 Inhabits Devonshire, often occurring under stones. 

 T8. Polt- Genus LXXVIII. Polydesmus. Antennas insert- 

 OJ3MU3. e d on the superior margin of the head, the last joint 

 exserted : body linear; the segments laterally compres- 

 sed and marginated ; eyes obsolete. The seventh seg- 

 ment from the head bearing but one pair of feet in the 

 male. The anterior joints of the body, in both sexes, 

 generally having but one pair of feet. 



Sp. 1. Compldnatns. Back tuberculated ; body de- 

 pressed ; the last joint pointed ; feet and belly light 

 yellowish white ; upper part light reddish-brown. 



Julus complanalus of Linne and Fabricius ; Jule opia- 

 te of De Geer, Polydesmus complanatus of Latreille. 



Inhabits moist woods and hedges under moss and 

 stones ; is very frequent about Edinburgh and London. 

 79. Pol- Genus LXXIX. Pollyxenus. Antenna? inserted 



lvsekus. under the margin of the head, very short and cylindri- 

 cal. Body elongated and depressed, the last segment 

 armed with a pencil. 

 La<nmu. Sp. 1. Lagurus. Bod}' brownish. 



Scolopendra lagnra of Linne and Fabricius, Pollyx- 

 eii us lagurus of Latreille. 



Inhabits Europe. Not yet observed in Britain. 



Family XXI. Scolopendrides. 



I. Every segment of the body bearing two pair of 

 feet. 



Genus LXXX. Scutegera. Each joint bearing 

 two pair of feet. 



Sp. 1. Colcoptrala. Feet thirty; body reddish-yel- 

 low, with longitudinal lines, and bands on the feet of a 

 blue-black colour. 



Genus Cermatia of Illiger. 



Julus araneoides of Pallas, Scutigera araneoides of 

 Latreille. 



Inhabits houses in the southern parts of Europe ; 

 In Mr Leach's museum are specimens of a very large 

 size from Madeira. 



II. Every segment of the body bearing one pair of 

 feet. 



The insects composing this division, have been con- 

 sidered, by all authors who have illustrated this depart- 

 ment with their writings, as forming one genus, which 

 they named Scolopendra. The specific characters were 

 taken from the number of feet : thus all the species 

 having forty-two feet, were considered as one species, 

 under the name Scolopendra morsitans; and other 

 species (as we shall point out below) were confounded 

 with one another in the same manner. In the follow- 

 ing arrangements, we shall adopt genera divided from 

 Scolopendra by Mr W. E. Leach, which we have copied 

 from his manuscripts. 



Genus LXXXI. Scolopendra. Antennae conico- 

 setaceous, composed of many articulations, which are 

 nearly conical. The inferior lip somewhat narrow- 

 er before than behind ; the anterior margin denticula- 

 ted, and divided by a deep fissure. Feet forty-two in 

 number, the hinder pair spinous at their base. The 

 segments of the body somewhat marginated. The an- 

 terior pair of feet minute. Eyes eight in number, four 

 on each side placed in a rhomboidal form. See Plate 

 CCXXI. Fig. 10. 



Obs. All the species of this genus have been consi- 

 dered as one by all authors, their characters being " Pe- 



so. SCBTE- 



Colcop. 

 tma. 



*l. Scoi.o- 



TESDr.A. 



.Plate 

 CCXXI. 

 fig. 10. 



dibus utrinque 20, oculia octo," Linn. Sysl. Nat. 1068. Crmtscea. 

 Fab. Ent. Syst. 2—390. In this character the last feet *— v~ — ' 

 are not enumerated. In the works of De Geer and 

 Latreille, we find the last pair (which are much larger 

 than the rest, but organised in the same manner) com- 

 puted as feet, and the character " posterioribus spino- 

 sis," particularly noted in the specific character : this 

 last, as we have mentioned in the generic character, is 

 common to all the species, as is also the Linnean " eyes 

 eight." We shall now point one such species as have 

 come under our notice ; and we have no doubt that 

 many more remain to be discovered, which hitherto 

 have been confounded under the title of S. morsitans. 



* The segments transversely quadrate. 



Sp. 1 . Spinipes. The segments rusty-brown ; the Spinipes; 

 angles rounded ; the antenna?, palpi, galeae, posterior 

 margins of the segments, and feet, yellowish ; all the 

 feet (excepting the anterior pair) with small spines on 

 their joints. 



Scolopendra Spinipes. Leach's MSS. 



Habitat unknown. 



Described from a specimen preserved in the College 

 Museum of Edinburgh. Length about 11 inches. 

 The lip and base of the mandibular ferrugineous. The 

 whole body, when examined with a lens, punctulated. 

 The nails, heels, and apex of mandibular, pitchy black. 



Sp. 2. Inermis. Segments brown, with the poste- Inermis. 

 rior margins and feet pale; feet not spiny; hinder feet, 

 as in the generic character, spiny at their base. 



Mus. Dr Barclay. 



Scolopendra inermis. Leach's MSS. 



Habitat unknown. 



** Segments oblong-square. 



Sp. 3. Morsitans. Joints rust-brown coloured ; feet Morsitaas. 

 pale. 



Habitat unknown. 



Mus. Dr Barclay. 



Scolopendra morsitans. Leach's MSS. 



*** Segments alternately oblong and transversely 

 quadrate. 



Sp. 4. Inoequalis. Segments rusty-brown; feet pale, inxquali;. 



Habitat unknown. 



Scolopendra inoequalis. Leach's MSS. 



Genus LXXXII. Cryptops. Antennae conico-se- $o, Crtp- 

 taceous, with 17 globular sub-conical joints. Anterior tops. 

 margin of the lip not denticulated, and scarcely notch- 

 ed. The basilar joint of the posterior feet not spiny ; 

 legs forty-two ; eyes not discernible. 



Sp. 1 . Hortcnsis. Body testaceous, inclining to rusty- Hor:ensis, 

 brown ; the back darker in colour ; antennae and feet 

 hairy. 



Cryptops hortensis. Leach's MSS. Scolopendra hor- 

 tcnsis, Donovan's British Insects, vol. xv. where it 

 was first figured and described, from specimens sent by 

 Mr Leach, under that name, to Mr Donovan. 



Inhabits gardens in and near Exeter in Devonshire, 

 discovered by Mr Leach. 



Genus LXXXIII. Lithoeius. Antennae with many 83. Lituo- 

 joints, (about 4s5) the two basilar ones largest, of a co- Blvi - 

 nical-filiform shape each, joints nearly conical. Eyes 

 granulated. Inferior lip anteriorly notched, the mar- 

 gin much denticulated. Feet thirty. 



To this genus Scolopendra colcoptrala of Panzer is 

 referable. Leach's MSS. translated. 



Sp.l. Forficatus. The whole under lip deeply punc- Forfic^t::* 

 tulated, the dots impressed ; feet testaceous-yellow. 



Scolopendra forficata of Linne, Fabricius, and La- 

 treille; Lithobius forficatus of Leaah's MSS. 



* 



