KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 21. N:0 9. 15 



vesicle is directed more or less upwards (or even forwards), so as to form, in general, 

 a right or even an acute angle with the fifth segment. Seen from below and from 

 the side the vesicle, including the sting, is probably about the length of the preceding 

 segment or somewhat longer; but without the sting it scarcely measures two-thirds of 

 that length, whilst the breadth or height at least equals the length. In front of the 

 sting it is slightly rounded above, strongly and broadly rounded below and behind. 

 Below, it is provided with coarse granules, in part disposed in a few rather irregular 

 rows; and on either side it shows three keels or rows of granules. A tine, elevated 

 line extends along the upper side of each of the two exteriör or uppermost keels of 

 the last segments of the tail. The sting (of which the end is löst) is rather strong, 

 curved slightly downwards, smooth, and probably somewhat shorter than the vesicle 

 itself. The chitinous covering of the body is at present devoid of hairs and bristles. 

 Seen under the microscope, it is irregularly studded with small rounded spöts, which 

 no doubt are the ends of the pore-canals, like those of recent scorpions^). Compare 

 figs. 9 and 10; the former represents a small piece of the integument of Palceophonus 

 nuncius, the latter a corresponding piece of that oi lurus Dufoureius (BrullÉ), or Buthiis 

 granulatus C. L. KocH. — Between the plates, segments, and joints, the skin is thinner, 

 of a lighter colour, and wrinkled, in the same manneras in modern scorpions (see fig. 8). 



Colour. — The specimen is generally of a dark yellowish-brown; the cephalo- 

 thorax and the anterior dorsal plates are brownish-yellow, whilst the tail and the distal 

 half of the palpi are more of a blackish-brown. 



Dimensions (in millimeters): 



Length. Breadth (greatest). 



The whole animal i-.'.'. 62 9(?) 



Cephalothorax __ 8,2 8,25 



1st segment of abdomen 2,i 8 



1st dorsal plate of abdomen _ 2.1 7 (at least) 



2nd n » , » » 2,5 ? 



3i'd » » » » --- 3 ? 



4th 1) » B » 3,5 ? 



öth segment n » 3,5 9 



') In lurns Dufoureius (Brullé), for example, the pore-canals ai'e of a very peculiar shape, somewhat resem- 

 bling a narrow phial, and they open with a globular or button-like papilla on the surface of the body. The 

 chitinous covering consists of four different layers, of which the outermost is thin and apparently structure- 

 less; the second or middle-layer is somewhat thicker, darker than the other layers, and densely striated in 

 a vertical direction, as if it were composed of small fibrillae or tubiili. The third layer is much thicker 

 than the other two, and in a vertical seotion appears to be horizontally striated (probably formed of ho- 

 rizontal layers). Seen from above, the integument, between the heads of the pore-canals, is densely and 

 more or less regularly punctato-striate, this apparent sculpture belonging probably to the second layer of 

 the skin; the areolar design seen on it belongs no doubt to the third layer, the areolse corresponding to 

 the cells of the hypodermis. (See figs. 11 and 12). The thiunest, innermost layer (c. c.) is transparent, 

 and though apparently without any structure in specimens preserved in spirits, may perhaps be consid- 

 ered as the chitinogene matrix or hypodermis. In other scorpions, as in Bothriurus d'Orbignyi (GuÉR.), 

 the pore-canals are narrower, cylindrical or somewhat conical. 



