452 BRITISH ORIBATID^. 



Heemannia nodosa,* sp. nov. PI. XLI, figs. 10, 11. 



Average length about '87 mm. 

 Average breadth about '50 mm. 

 Average length of legs (first pair) about '47 mm. 

 Average length of legs (second and third pairs) about 

 •40 mm. 



Average length of legs (fourth pair) about '53 mm. 



This species is very like H. picea, but is longer in 

 shape and longer in the legs, and has short pseudo- 

 stigmatic organs instead of long; it is not such a 

 heavy, clumsy-looking creature as H. picea, and there 

 are some other differences. 



Colour varies from moderately dark to very dark 

 brown, sometimes almost black. 



Texture rough and dull, coarsely dotted, dots some- 

 times coalescing and forming lines. 



Cephalothorax large and heavy ; rather longer in 

 shape than that of H. picea. The frons, which is 

 small, is distinctly divided from the dorso-vertex by a 

 transverse sulcation (the pro vertex not showing), the 

 hinder part of the dorso-vertex has a median longitu- 

 dinal sulcation with a large mammilliform elevation on 

 each side, occupying the whole width of the cephalo- 

 thorax. Rostrum deep and moderately broad, rounded. 

 Rostral hairs set high up and rather near together. 

 No trace of lamellae, but the lamellar hairs persist, and 

 are near together, thick, and slightly spatulate. 

 Pse ado- stigmata at the antero-lateral edges of the 

 mammillary projections (they are a trifle too near 

 together in the plate) ; only slightly projecting ; not 

 large. Pseudo-stigmatic organs sJiort, gradually clavate, 

 blunt-ended, and roughened near the end with small 

 points or hairs. Interlamellar hairs thick and spatu- 

 late, slightly curved, as long as, or longer than, the 



* Nodosus, covered with knots or knobs. 



