CENTRUKOIDES. 



23 



c?. Total 



the aculeus. Chelae at most finely granular, the crests with pearl-lite granulations ; hand wider than 

 the brachium, its width less than half the length of the movable finger, its upperside with two finely 

 granular keels running from the immovable finger ; movable finger a little longer than the carapace, 

 furnished with a large basal lobe and with eight rows of teeth. Pectinal teeth 22-23. 

 <S . Like the female in colour and granulation. Tail much longer, as much as about six and a half times as long 

 as carapace, which is slightly longer than the first segment and about half the length of the first and 

 second; fifth caudal segment a little narrower than the first, almost as high as wide and a little less 

 than three times as long as high ; vesicle broadly oval, about twice as long as high. Hand a little 

 wider and longer than in female; the fingers not quite in contact basally when closed. Pectinal 



teeth 23-25. 

 Measurements in mm.— $ • Total length 60, carapace 6, tail 35 ; width of brachium 2, of hand 2-2. 



length 63, carapace 5-5, tail 40 ; width of first segment 2'7, of fifth 2-5, height of latter 2-5 ; length of 

 vesicle 4, height and width 2 ; width of brachium 2, of hand 2-3. 



Hah. Mexico 3 - 6 , Yautepec (A. Duges), Acapulco, Amula, Omilteme, Cuernavaca 

 (II. II. Smith). 



The above-given description is taken from adult male and female examples from 

 Yautepec. In addition to these, the Godman and Salvin collection contains large 

 numbers of specimens ticketed S.Mexico, and others from Acapulco, Amula, and Omil- 

 teme (8000-8500 feet), in the State of Guerrero, as well as a few from Cuernavaca. 



Kraepelin determined this species as C. infamatus, C. Koch, but none of the 

 specimens that I have seen agree with the description and figures of the typical 

 example of that species, for which no locality was known. This specimen, measuring 

 60 mm. in length, had a large, blunt, subaculear tubercle ; the legs were marbled, but 

 the chelae entirely pale, and the carapace had not the arrangement of colour character- 

 istic of the examples described above, the anteocular area being given as brown, and 

 the lateral portions dark brown with yellow edges, whereas the figure shows the 



l each side with three oblique black stripes, the 

 ;dian ocular tubercle. In this feature C. infamatus 



more nearly approaches the following species, C. vittatus. 



Aeain the individuals from Mexico described by Thorell as Centrums elegans, 



been ornamented o 

 forwards from the m 



although agreeing in coloration with those described above, differ in their very much 

 larger size, being 82 mm. in length, with the carapace 8 and the tail 50, and in having 

 a small and slender subaculear tooth. Of specimens representing, I believe, this form 

 the British Museum has several examples, including adult males and females, for 

 which, unfortunately, no locality is known. They differ from those described above 

 in having the chela?, chelicerse, legs, and tail entirely pale, without trace of variegation, 

 and in their larger size and in the presence of a distinct and slender subaculear tooth. 

 An adult female measures 79 mm., with the carapace 8 and the tail 50, as in Thorell's 

 type ; and an adult male measures 68 mm., with the tail 44 and the carapace 6. It 

 is interesting to observe that in one of the female examples the subaculear tooth is 

 reduced to a small tubercle. The greater part of the specimens that I refer to this 

 species seem to belong to the form that Karsch described as C. Mmpidus, the types of 



