666 



ENTOMOLOGY. 



La Forbicine /dale. Geoff. Hist. des. Ins. ii. 613. plate 

 20. f. 3. 



This is the only species known. It is very common 

 amongst books, clothes, Sec. and wanders about during 

 the night. It is supposed to have been originally intro- 

 duced into Europe from America, where it is said to 

 live amongst sugar. 



Family II. Forbicinida. 



Body convex, with an arched back formed for spring- 

 ing. Tail with three setae, the middle one longest. 



Genus II. Forbicina. Geoff. 



Lepisma. Linn. Oliv. 



Machilis. Latr. 



Antennae inserted under the eyes, shorter than the 

 body. Maxillary palpi thick, with six joints, the last 

 conic. Labial palpi, with the apex membranaceous. 

 Eyes large and contiguous. 



Sp. 1. Polypoda. Smoky brown, with obscure rust- 

 coloured spots. 



Lepisma polypoda. Linn. 



Lepisma saccharina. Vill. Ent. 4. tab. 1 1. fig. 1. 



Machilis fioly/toda. Latr. Gen. Crust, et Ins. i. p. 165. 

 tab. 6. fig. 4. magnified. 



La Forbicine cylindrigue. Geoff. 



Inhabits all the temperate parts of Europe, and is 

 found in woods, and under stones. 



Genus III. P^trobius. Leach. 



Lepisma. Fabr. ? 



Antennae longer than the body, inserted under the 

 eyes. Maxillary palpi six-jointed, the fifth joint inverse- 

 ly conic, the sixtli conic. Labial palpi, with the last 

 joint obliquely truncate, with the apex acute, and not 

 membranaceous. Eyes large and contiguous. 



Sp. 1. Maritimus. Blackish, with golden scales. Feet 

 yellowish. Setae of the tail annulated with white. 



Inhabits all the rocky shores of Britain. Dr Leach 

 first observed this species on the Devonshire coast, and 

 afterwards in Ireland, Scotland, and Wales, Can it be 

 the Lepisma polypoda of Fabricius ? 



Tribe II. Podurellides. 



Palpi not exserted, nor very conspicuous. Antennae 

 composed of four joints, tho last sometimes formed of 

 several other minute articulations. Tail forked, and 

 bent beneath the abdomen. 



Genus IV. Podura. Linn. Geoff. De Geer, Fabr. 

 Lam. Hermann. 



Antennae with the last jtfint solid, not articulated. Ab- 

 domen elongate, linear. 



Sfl. 1. Plumbea. Lead coloured, shining, with gri- 

 seous head and feet. 



Podura plumbea. Linn Fabr. Lat. 



Podure plumbee. De Geer. 



La Podure grise commune. Geoff. 



Inhabits Europe, under stones. A good figure may 

 be found in Roemer's Genera Insector urn, tab. 29. fig. 2. 



There arc a vast number of species in this and the fol- 

 lowing genus, which are worthy of attention. Fabricius, 

 who placed these two genera together without the 

 slightest distinction, has described several species, to 

 which we cannot refer, from not having studied his spe- 

 cies, which we trust some future zoologist will be in- 

 duced to examine. 



Genus V. Smynthurus. Latr. 



Podura Linn. Fabr. De Geer, Geoff. 



Sp. 1. Fuscus, Body entirely brown. 



La Podure brun enfumie. Geoff. 



Podure brun, ronde. De Geer, Mem, aur les Ins, vii. 

 35. tab. 3. fig. 7, 8. 



Podura atra. Linn. ? Fabr. 

 Smynthurus fuscus. Latr. 



Inhabits Europe, is common on the ground, and in 

 damp hedges. 



<S^. 2. Viridis. Body green. 



Podura viridis. Linn. Fabr. 



La Podure verte aux yeux noirs. Geoff. 



Smynthurus viridis. Latr. 



Inhabits various trees in Europe. 



Order II. ANOPLURA. 



Tail without setae or filaments. Mouth in some fur- 

 nished with two teeth, (or mandibles ?) and an opening 

 beneath ; in others with a tubulose, very short haustel- 

 lum. 



The animals of this order are parasitical, and were by 

 Latreille placed in an order which he named Parasita. 

 This name Dr Leach has changed for the sake of har- 

 mony, and also to rentier the name more easy of reten- 

 tion in the memory, the characters being drawn from the 

 same parts. 



Their motion is slow, and their nourishment is deri- 

 ved from the blood of mammalia, birds, and insects. 



It is almost an established fact, that every species of 

 bird (and probably mammifcrous animal) has its own 

 peculiar parasite; and there is no instance of the (same 

 species of louse having been observed on two distinct 

 species of birds, although some birds (as the raven, oys- 

 ter-catcher, Sec.)- are infested with several species of 

 parasites. The importance of clearly ascertaining the 

 truth is such, to the ornithologist, that Dr Leach has 

 employed a considerable portion of time, for the purpose 

 of investigating and of describing the species with ac- 

 curacy, little more than a bare catalogue of names and 

 habitats having been given in the works of Linnaeus, Fa- 

 bricius, and Gmelin. The result of his examinations he 

 does not consider himself as able to communicate at 

 present ; but it is his intention, when the subject has 

 arrived at maturity, to give a paper on this order to the 

 Linnean Society of London. 



Tribe I. Pediculides. 



Mouth consisting of a tubulose, very short haustelluirf. 



Genus VI. Pthirus. Leach. 



Pediculus. Linn. Redi, Latr. Fabr. 



Anterior pair of feet simple, two hinder pair didac- 

 tyle. Thorax extremely short, scarcely visible. 



5/i. 1. Inguinale. Body whitish. 



Pediculis inguinalis. Redi. 



Ptdiculis pubis. Linn. Fabr. Latr. 



Le morpion. Geoff. 



Inhabits the pnbes and eyebrows of men and women, 

 especially of those of easy virtue, being commonly known 

 under the titles crabs, crab-lice, &c. 



Genus VII. Pediculu* Linn. Fabr. De Geer, Geoff. 

 Redi, Hermann, Lam. 



Feet all armed with a finger and thumb. Thorax com- 

 posed of three distinct equal segments. 



Sp. 1. Humanus. Body oval, lobate, white and nearly 

 immaculate. 



Pediculus humanus. Fabr. Linn. Latr. 



Pou humain du cor/is. De Geer, Mem. sur les Ins. torn, 

 vii. p. 67. plate 1. fig. 7. 



Inhabits the bodies and garments of men, and is known 

 by the name of the body-louse. On the continent of Eu- 

 rope, especially in Spain and Portugal', it is very abun- 

 dant. In Britain it is of very rare occurrence, and 

 may haye been introduced from the neighbouring coun- 

 tries. 



