300 CLASS VIII. 
(Cyphodeirus Nicourer), Tomocerus Niconer (Macrotoma Bour- 
LET.) 
Sp. Desoria glacialis NicouxET, 1. 1. Pl. 5, fig. 10; first found in 1849 on 
Monte Rosa, afterwards on the Unter-Aar glacier ; see AGASSIZ Geologische 
Alpenreisen von Désor, Deutsch von C. Vogt, Frankf. a. Main, 1844. 8vo, 
s. 181, 182. 
OrveER III. Parasitica. 
Hexapod, apterous, not undergoing metamorphosis, parasitic. 
Two simple eyes, sometimes none. 
These animals, also named Lpizoa (as opposed to Entozoa, our 
fifth class, see above), cannot well be otherwise defined than by the 
short account that we have given of them. The absence of a forked 
tail or of setze on the abdomen’, distinguishes them indeed from 
most but not from all Insects of the former order. The flea and 
some wingless species of the order Diptera are distinguished from 
these parasites by their undergoing complete metamorphosis. 
Comp. on this division C. L. Nrrzscu, Die Familien und Gattungen der 
Thierinsecten (insecta epizoica), in GERMAR u. ZINCKEN, Magazin der En- 
tomologie, 111. Halle 1818, s. 261—316, Here however the parasitic Dzp- 
tera (Hippobosca, Nycteribia &c.) are included in the same division. NitzscH 
arranged the rest according to their oral organs, those in which they are 
suctorial, amongst the Hemiptera, those in which they are manducatory, 
amongst the Orthoptera ; two orders in which the inclination to abortion 
of the wings is evident, and which undergo an incomplete metamorphosis, 
which therefore in the wingless genera can shew itself as change of skin alone. 
See also Gurit Ueber die auf den Haus-Saiigethiéren und Hausvigeln 
lebenden Schmarotzer-Insecten und Arachniden, Magazin fiir die gesamte 
Thierheilkunde, Vitl. 1842. s. 41I1—433. Tab. Iv. and Ix. 1843. s. I—24. 
Tab. 1. Some figures are also found in Lyoner, Recherches sur differentes 
especes a’ Insectes, ouvrage posthume, Paris 1832, 4to ; Denny, Monographia 
Anoplurorum Britannic, or An Essay on the British Species of Parasites, 
London, 1842; a work of detail which I received too late to make use of. 
Family V. Hematopina s. Pediculina. Mouth anterior, com- 
posed of a rostellum, retractile, vaginate at the base. ‘Tarsi uni- 
articulate, with single arcuate claw’. 
Pediculus L. (exclusive of several species). Antenne filiform, 
quinquearticulate. Vagina of the rostrum aculeate at the point. 
1 Hence the name Anoplura LracH. See his work On the Families, Stirpes and 
Genera of the Order Anoplura, Zoological Miscellany, 111. 1817, pp. 64—67. 
* By some writers this hook is considered as the second joint of the tarsus. 
