72S 



ARTHROPODA 



Acaropsis Moquin-Tandon, 1863. 



Acaropsis mericourti Laboulbene has been found in the human external 

 auditory meatus. 



SUPERFAMILY B. EUPOPOIDEA. - 



Family Bdellid^. 



No specialized seta on cephalothorax ; integument not chitinized or leathery; 

 palpi composed of four or five segpients; cephalothorax large and clearly 

 separated from abdomen; palpi large, geniculate, and bearing distally long 

 tactile bristles; mandibles chelate. 



Tydeus molestus Moniez, 1889, 



This mite was imported into Belgium in Peruvian guano, and caused much 

 trouble to man and beast. 



Family Tarsonemid^. 



With marked sexual dimorphism and tracheae. No ventral suckers. 

 Tarsonemus hominis Dahl, found in. cancerous tissues in man, is probably 

 an accidental contamination of the preserving fluids. 



Figs. 343-3/3. — Pediculoides ventricosus Newport. 

 a, Male (X 350); b, female (X 220); c, distended female (X 60). 



Genus Pediculoides Targioni-Tozzetti. 

 Pediculoides ventricosus Newport, 1850. 



Synonyms. — Heteropus ventricosus Newport, 1850; Acarus tritici Lagreze- 

 Fossot and Montane, 1851; Physogaster larvarum Lichtenstein, 1868; Pedi- 

 culoides tritici Targioni-Tozzetti, 1878; SphcBvogyna ventricosa Laboulbene and 

 Megnin, 1885; Tarsonemus monougniculosus . 



This mite causes severe itching and urticarial eruptions on the breast, 

 arms, face, neck, and shoulders of persons handling corn and barley, which 

 contains it, in India, Algeria, and Europe. 



Morphology. — Males are oval, 0-12 by o-o8 millimetre, with six pairs of 

 dorsal hairs and a lyre-shaped lamella. 



