G. H. F. Nuttall 
335 
1767. Pediculus humanus Linnaeus 1767, Systema Naturae (eel. XII, Reformata), n. p. 1016, 
head-lice and body-lice regarded as varieties numbered 1 and 2 respectively: 
“Habitat in capite et vestimentis hominis:—Varietas Capitis durior, coloratior; 
Vestimentorum laxior, magis cinerea.” 
“Problema qui solvat, cur aliae ejusdcm speciei familiac mordicus Capiti 
inhaerunt, aliae corporis vestimentis, is facile plurium morborum contagiosorum 
naturam intelligat.” Which Barbut (1781, p. 329) translates: “He that could 
solve the problem why some families of the same species stick to the head, others 
to the clothes, would easily understand the nature of many contagious diseases.” 
1775. Pediculus humanus Linn, in Fabricius (1775, p. 804): “Habitat in capite et vesti¬ 
mentis humanis. In pueris gulosis frequentissimus.”....“ Varietas capitis durior, 
coloratior, vestimentorum laxior, magis cinerea.” He gives a brief and useless 
description. 
1778. Pediculus humanus capitis de Geer 1778, Mem. Hist. Ins., vn. pt 1, fig. 6. Head- 
louse. 
Pediculus humanus corporis de Geer 1778, Ibid. fig. 7. Body-louse. “II y a done 
une difference palpable entre ces deux sortes de poux, et qui semble indiquer 
qu’ils sont d’espece differente, a moins qu’on ne veuille plutot, commc a fait 
M. de Linne, les regarder comme deux varietes. Quoiqu’il en soit, on pourroit 
les distinguer par les denominations suivantes: (1) Pediculus (humanus capitis) 
cinereus, thorace abdomineque fascia interrupta nigra marginatis; (2) Pediculus 
(humanus corporis) albidus totus immaculatus.” 
1783. Pediculus humanus Linn., a. capitis, (3. corporis de Geer. Retzius (1783): de Geer, 
Gen. et Spec. Ins. p. 201, sp. 1323 a-/3. 
1803. Pediculus humanus Linn, in Latreille (1803), Diet. Hist. Nat., xvm. p. 403; 1804, 
p. 93, sp. 1: “le pou du corps”; a definite restriction of the name to the body- 
louse. 
Pediculus cervicalis Latreille 1803, Diet. Hist. Nat., xvm. p. 403; 1804, p. 94, sp. 2. 
He makes a distinct species of “le pou de tete.” 
Note: If this were a good species, the name P. capitis (de Geer 1778) would 
have priority, first having been applied to the head-louse as a possible variety of 
P. humanus, mark the bracket which is often omitted by those who regard capitis 
as a valid species. 
1810. Pediculus humanus Leach 1810, p. 11, fide Stephens (1829). 
Pediculus cervicalis Leach 1810, Ibid. 
1817. Pediculus humanus Leach 1817, p. 66, sp. 1. Syn. “ Ped. pubescens a Olfers 80, body 
louse or Tailor’s louse.” 
Pediculus cervicalis Leach 1817, p. 66, sp. 2. “Ped. humanus var. Linn. Syst. Nat., 
i. 1016.” 
1818. Pediculus capitis Nitzsch 1818, III. p. 305. 
Pediculus vestimenti Nitzsch 1818, Ibid. Name commonly applied by German 
authors (vide Eysell, 1913, p. 48, etc.), and those who follow them. The name 
has no validity ( — P. h. race corporis). 
1824. Pediculus tabescentium Alt 1824 ( = P.h. race corporis). Cited as a valid species 
by Goldfusz and Burmeister, Denny, etc., but rightly condemned by Landois, 
and by Piaget (1880, p. 625, q.v.); not mentioned by Dalla Torre (1908, p. 8). 
1829. Pediculus humanus Stephens 1829, p. 329, sp. 9318: “Body-louse, or Tailor’s 
louse.” This author gives references to Berkenhout, Shaw, Turton, Samouellc 
and Langley (see bibliogr.) and “Stew. n. 278,” and gives “Pe. capitis de Geer 
(teste Nitzsch)” as a synonym. 
Parasitology xi 22 
