300 CLASS VIII. 



(Cyphodeirus NICOLET), Tomocerus NICOLET (Macrotoma Boun- 

 LET.) 



Sp. Desoria glacialis NICOLET, 1. 1. PI. 5, fig. 10; first found in 1849 on 

 Monte Rosa, afterwards on the Unter-Aar glacier ; see AGASSIZ Geologische 

 Alpenreisen von DESOR, Deutsch von C. Vogt, Frankf. a. Main, 1844. 8vo, 

 s. 181, 182. 



OKDER III. Parasitica. 



Hexapod, apterous, not undergoing metamorphosis, parasitic. 

 Two simple eyes, sometimes none. 



These animals, also named Epizoa (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 setae on the abdomen 1 , 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. NITZSCH, Die Familien und Gattungen dcr 

 Thierinsecten (insecta epizoica), in GERMAR u. ZINCKEN, Magazin der En- 

 tomologie, ill. Halle 1818, s. 261 316. Here however the parasitic Dip- 

 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 GURLT Ueber die auf den ffaus-Saugethieren und Hausvogeln 

 lebenden Schmarotzer-Insecten und Arachniden, Magazin fur die gesamte 

 Thierheilkunde, vm. 1842. s. 411 433. Tab. IV. and IX. 1843. s. 124. 

 Tab. I. Some figures are also found in LYONET, Recherches sur differentes 

 especes d'lnsectes, ouvrage posthume, Paris 1832, 4to ; DENNY, Monographia 

 Anoplurorum Britannia, 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. Hcematopina s. Pediculina. Mouth anterior, com- 

 posed of a rostellum, retractile, vaginate at the base. Tarsi uni- 

 articulate, with single arcuate claw 2 . 



Pediculus L. (exclusive of several species). Antennae filiform, 

 quinquearticulate. Vagina of the rostrum aculeate at the point. 



1 Hence the name Anoplura LEACH. See his work On the Families, Stirpes and 

 Genera of the Order Anoplura, Zoological Miscellany, in. 1817, pp. 64 67. 



2 By some writers this hook is considered as the second joint of the tarsus. 



