BDELLA. ARACHNIDES. 20? 



FAMILY VI. RICINIJE. 



Feet not proper for swimming ; animals not aquatic, wandering 

 or parasitical. 



Gen. 21. BDELLA, Lat. Acarus, Lin. 



Palpi small, filiform, long, geniculated, the apex setigerous ; 

 mouth in the form of a conical beak ; four eyes ; eight legs, 

 the posterior ones longest ; body soft. 



B. rubra, Lat. (A. longicornis, Lin.) Body scarlet, legs paler ; 

 rostrum longer than the thorax. Inhabits Europe, under stones. 

 Lat. Hist. viii. pi. 67, ng. 7. 



Gen. 22. SMARIDIA, Lat. 



Mouth elongated into a beak ; palpi small, filiform, straight, 

 simple ; eyes two ; body oval, scaly ; anterior legs longest. 



S. sambuci, Lat. Body red, with the palpi and feet paler, and 

 the eyes black. Inhabits trunks of trees, especially the Alder. 

 Lat. Gen. i. 153. 



Gen. 23. IXODES, Lat. Acarus, Lin. 



Mouth formed of a sucker composed of three horny and dentat- 

 ed laminae, inclosed between two palpi and projecting ; palpi 

 terminal, short, coriaceous, and flattened ; body ovate-orbicu- 

 lar, very flat ; no eyes. 



The animals of this genus are parasitical and suck blood, and in some countries 

 are the scourge of cattle. 



I. ricinus, Lat. Body deep blood-red ; thorax brownish, with two 

 impressed lines ; abdomen varying in colour. Inhabits Europe, 

 attaching itself to dogs. Lat. Gen. i. 156. 



Gen. 24. ARGAS, Lat. Acarus, Fab. 



Palpi short, conicaL and four-jointed ; rostrum inferior and dis- 

 covered. 



A. marginatus, Lat. Pale yellowish or fleshy violet, with blood- 

 red branching lines, Inhabits France, sucking the blood of pigeons. 

 Lat. Gen. i. 155. 



FAMILY VII. MICROPHTHIRA. 

 With six feet, and parasitical. 



Gen. 25. CARIS, Lat. 



Legs six ; palpi subconical, porrect, of four joints, and the 

 length of the rostrum ; rostrum conical ; body coriaceous, 

 depressed, suborbicular. 



C. vespertilionis, Lat. Body fuscous. Found on bats. Lat. Gen.i. 161. 



Gen. 26. LEPTUS, Lat. Acarus, De Geer. 

 Legs six ; palpi short, subconical ; mouth with a porrected ros- 

 trum ; body soft, generally oval. 



