6 E. W. Gates— 0» the Species of Thelyphonus iiihahiting [No. 1, 



Adults of both sexes may be recognized by a certain redness and 

 tumidity of the first lower abdominal segments not apparent in the 

 immature animal. 



I append a key to the eleven species known to me, and, in the iilate, 

 I have figured some jjarts of certain animals which will be of groat 

 assistance in the discrimination of the species. 



In my descriptions I have only dwelt upon those characters which 

 are of importance, chiefly the details of the chclicercs, the colours, and 

 the important points of the cephalothorax and abdomen. I have not 

 found the legs to vary in any appreciable degree in the different species, 

 and therefore I have omitted them. 



It will be noticed in the key that the females of some species cannot 

 be discriminated from each other. I do not mean by this that the 

 females are absolutely alike, but merely to express my inability to 

 diagnose them in intelligible brief terms. Compared with each other 

 they are sufiiciently distinct, varying in shade of colour, shape of 

 cheliceres, and in other points. 



There are many immature specimens in the Indian Museum which 

 I have hesitated to describe till mature animals are available. It is to 

 be feared that many of the descriptions of these animals are based on 

 young specimens, and, if so, they are useless, as the young of many 

 species (which, when adult, are perfectly distinct) are absolutely alike. 



On examining the specimens which the late Dr. Stoliczka referred 

 to T. angustus, Lucas (J. A, S. B. 1873, pt. ii, p. 134), I found that the 

 specimens were referable to the young of T. assamensis, T. formosiis, and 

 a species from Penaug, the adult of which is unknown. 



Key to the Species, 

 a. With a sharp ridge between the central and lateral 

 eyes. 



a'. First joint of cheliceres with a lateral spine 

 as well as a terminal one. 

 a". Apophysis of the fourth joint of the cheli- 

 ceres cylindrical, smooth on both edges, 

 the outer edge rounded oif at the tip 



(Pig. 13) assamensis, d*. 



h". Apophysis of the fourth joint of the cheli- 

 ceres sharply triangular, serrated on both 



edges assamensis, ? , 



h'. First joint of cheliceres with only a terminal 

 spine ; second joint generally with G tooth. 



