



















# 























































18 



SC0EP10NES. 













V 



« 



the fulcra), and by the difference in the stigmata, which have the form of narrow crescentic slits opening 







upon an elevated smooth oval area. 



Type M, 





Distribution. M 



















■ 









i 





















*• 







. 





■ 





1. Megacormus granosus. (Tab. V. figg. l-l h, <j .) 



Scorpio (Chactas) granosus, Gervais, Arch. Mus. iv. p. 233, t. 12. figg. 42-44 (1844) * j Ins. Apt. 











iii. p. 65 (1844) \ 







Chactas granosus, Karsch, Mittheil. Munch, ent. Ver. iii. p. Ill (1879) 3 . 



Megacormus granosus, Karsch, Arch. f. Naturg. xlvii. p. 17 (1881) 4 ; Kraepelin, Jahrb. Hamb. 



Wiss. Anst. xi. p. 151 (1894) 5 ; Das Tierr., Scorpiones et Pedipalpi, p. 162 (1900) e ; Pocock, 



Ann. & Mag. Nat. Hist. (7) v. p. 470 (1900) \ 

 [Nee Scorjno granosus, Gervais, in Castelnau's Exped. dans FAmer. du Sud, Myriap. et Scorp. 



p. 42, t. 2. figg. 2, 2a-c (1857).] 



Hal. Mexico 1 2 3 6 , Cordova 4 , Huatusco. 



* 



This species apparently differs from M. segmentates in having the pectin es without 



- 



the transverse joints, the basal portion of the shaft exhibiting merely a longitudinal 

 sulcus ; but I have had no opportunity of comparing in detail a specimen of 

























i 







M. granosus with the type of M. segment atus . The figure of the former on Tab. V. is 

 taken from an example kindly lent me by Dr. Fritsch, the same example as that 

 described by Kraepelin ; and since only one example of each of the two kinds has 











been examined, it is possible that the difference in the structure of the pectines above 

 referred to may prove to be merely sexual. Nevertheless it is possible that a detailed 



i 



and comparative study of the two forms with the types, side by side, may reveal other 

 differential features which under present circumstances it is not possible to point out^ 



• 















2. Megacormus segment atus. 





Megacormus segmentatus, Pocock, Ann. & Mag. Nat. Hist. (7) v. p. 470 (1900) \ 





Colour a tolerably uniform deep brown ; terga with an indistinct marginal spot in the middle and on the poste- 

 rior angle ; ventral surface a little paler; legs indistinctly banded. Upperside of trunk coarsely and closely 

 granular, a long median granular crest running backwards from the ocular tubercle ; terga without crests, 

 except the last, which has four coarsely granular crests, the median area of the plate coarsely granular. 

 Sterna, especially the first, fourth, and fifth, granular ; the second and third smooth and punctured anteriorly ; 

 the fifth coarsely granular throughout, with a short median keel and a few large granules forming a very 

 short crest on each side. Tail about three and a half times as long as the carapace, which equals the first, 

 second, and half the third or the third and fourth segments and slightly exceeds the fifth ; third segment 

 wider than long, fourth a little longer than wide, fifth a little more than twice as long as wide ; all the keels 

 coarsely granular ; lateral and inferior surfaces coarsely granular, a few coarse granules on the upperside 

 of the first, second, third, and fourth segments, a median lateral crest on the first and on the anterior 

 half of the fifth ; upperside of fourth deeply excavated, with elevated keels, also of the second and 

 third, though to a less degree ; upperside of fifth with sharp elevated lateral border, space between them 

 very finely granular ; vesicle smooth and punctured above, very finely granular below and laterally, almost 

 as wide as the fifth segment and considerably wider than the humerus. Ghelce : upperside of humerus and 

 brachium coarsely granular, all the crests coarsely granular ; the brachium with five crests one large 













































-' 



• I 



























