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Description of a new Genus and Species of Arachnida 

 (Calyptostoma Hardii.) By the Rev. 0. P. CAMBRIDGE, 

 M.A., C.M.Z.S., Hon. Memb. N.Z. Inst. 



[From the " Annals and Magazine of Natural History," December, 1875.] 



Order ACARIDEA. 

 Family Trombidides. 

 Gen. nov. CALYPTOSTOMA. 



Characters of the Genus. 



Body oblong oval, rather broader before than behind (the fore 

 part somewhat obtusely subangular), upper surface very convex ; 

 epidermis continuous, without any contractions or foldings to in- 

 dicate the limits of the cephalothorax, caput, or abdomen. 



Mouth-parts apparently very minute, concealed in a deepish 

 circular cavity at the extremity of the fore part. 



Eyes six in number, in three pairs, forming a triangle on the 

 upperside of the fore part of the body ; the apex of the triangle 

 (being the most obtuse of its angles) directed forwards ; the eyes 

 of each pair are contiguous to each other, and seated on very 

 slight tubercles. 



Legs short, slender, seven -jointed ; the legs of the first and 

 second pairs and third and fourth pairs, respectively, on either 

 side, have their basal joints in contact with each other, describ- 

 ing nearly a square on the under surface of the body, towards 

 the fore part ; their relative length appears to be 4, 1, 2, 3, 

 though those of the fourth and first pairs are very nearly of the 

 same length, and those of the third pair but little, if anything, 

 shorter than those of the second. Each tarsus terminates with 

 two curved claws, which spring from a cleft at the extremity of 

 its upperside. 



The genital aperture (female) is placed just behind the basal 

 joints of the third and fourth pair of legs. 



Calyptostoma Hardii, sp. n. 



Adult female, length 2 lines. 



The colour of this interesting Acarid is a uniform reddish 

 yellow (which, however, may possibly, in life, have been a bright 

 red), the legs and genital and anal apertures being light yellow- 

 brown ; the whole epidermis, which is of a somewhat coriaceous 



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