COLLECTED IN THE HADEAMAITT, SOUTH ARABIA. 295 



T,egs witli granular crests on the femora, smootli on the 

 patellae ; the posterior two feet on each side clothed below with 

 two rows of setae, the anterior o£ these rows atrophied on the 

 anterior feet ; coxae of the legs granular, especially on the edges. 



Pectines furnished with from 17-22 teeth. 



Measurements in mm. of type. — Total length 36"5, of carapace 

 4-4, of tail 22-5 ; width of 1st segment 3-3, of 5fch 2-9. 



Loc. Hadramaut. 5 specimens collected " by the way." 



This species seems to be rather •variable in its characters. 

 Those respecting colour have been already mentioned ; but in 

 addition the smallest example obtained has the interocular area 

 of the carapace smooth, and the coxae also almost smooth. The 

 sculpturing of the posterior segments of the tail appears in some 

 cases to be describable as wrinkled. 



There is no doubt that this species approaches the genus 

 Butheolus ; and of the forms ascribed to this genus, it is to the 

 type thalassinus, Sim. (Ann. Mus. Grenov. xviii, p. 248), described 

 from Aden, that the resemblance is greatest. Butheolus thalas- 

 sinus is unknown to me ; but, judging from Simon's description, it 

 may be distinguished from Buthus anthracinus by having the ante- 

 rior region of the carapace sloped, the ocular tubercle granular, 

 the 5th abdominal sternum coarsely granular, the tail posteriorly 

 dilated (compare, however, the figure, which represents the tail as 

 posteriorly narrowed), and the vesicle small and narrow. In all 

 these characters fA«Zassi«Ms approaches the best known form of all, 

 the allied Orthochirus melanurus(K.eBsler) = Schneideri'(L. Koch)*. 



Paeabuthus liosoma {Hempr. Sf Ehrenl.). 

 Loc. Shehu, and by the way. 



Nebo elavipes, Simon. 



Nebo flavipes, Simon, Ann. Mus. Geneva, xviii. p. 249 (1883). 



Loc. Hadramaut. Four specimens, collected by the way. 



The largest of these Scorpions is a male measuring 123 mm. ; 

 this size is chiefly owing to the great length of the tail, which is 

 almost six times as long as the carapace. The British Museum, 

 however, has an example still larger than this one, namely, a 



* It will probably be found that more than one species has been included under 

 this name ; but more material must be obtained before their hmits can be accu- 

 rately determined. Prof. Kraepelin's figure of the dentition of the chela on pi. ii. 

 fig. 21 of his paper is quite unlike the arrangement in some of the specimens 

 that I have examined. 



