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SCORPIONES. 



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Chactas opacus, Karsch, Mittheil. Munch, ent. Ver. iii. p. 134 (1879) (J) 

 Broteas panamensis. Thorell, Bull. Soc. Ent. Ital. xxv, p. 382 



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2 . Colour a deep reddish-brown, ventral side of trunk ochre-brown ; vesicle clear reddish-brown ; chelae nearly 

 black ; legs clear reddish-brown. Carapace as long as the first and second, and one-fourth of the third, 

 caudal segments, slightly longer than the fifth, smooth and polished on the frontal area, on the ocular 

 tubercle, and behind on the middle, finely and closely granular at the sides. Terga smoothly polished, 

 slightly shagreened at the sides, the last very distinctly granular and bitubercular laterally. Sterna 

 smooth and polished, the last without keels ; an ill-defined pale (sensory ?) area in the middle of the poste- 

 rior border of the third. Tail about three and a half times as long as the carapace, narrowed posteriorly ; 

 the first segment much wider than long, second a little wider, third as wide as long, fourth one-fourth 

 longer than wide, fifth a little more than twice as long as wide and about twice as long as the second 

 segment; superior and superior lateral keels developed and granular, and the rest of the keels obsolete on 

 segments 1-4; upperside of these segments scarcely granular, the sides weakly granular; underside of 

 first and second smooth and polished, of third weakly granular behind, of fourth coarsely granular ; fifth 

 segment coarsely granular below and at the sides ; vesicle granular below, its width a little wider than its 

 height and equal to the width of the fifth caudal segment. CTxelce with two granular crests above, weakly 

 granular above and in front ; brachium very weakly granular above and behind ; hand thick, its width 

 a little exceeding the length of the underhand and equal to the movable finger, covered above and to a 

 less extent below with a fine network of granules, which spread on to the base of the'fingers ; the inner 

 edge subdenticulate ; fingers short, the immovable less than twice as long as wide, the movable a little 

 shorter than the carapace. Legs smooth and polished; the femora at most very weakly granular. 

 Pectines with 8 teeth. 



c?. The same size and colour as the female. The terga shagreened. Sterna as in female, but with the 

 sensory area on the third more conspicuous. Tail longer, about four and a half times as long as the 

 carapace, which is scarcely as long as the fifth segment ; vesicle inflated, the width equal to that of 



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the first caudal segment, 

 female, with 8 teeth. * 



Chelce hardly differing from those of the female. 



Pectines larger than in 



Measurements in mm. — $ . Total length 50, carapace 7, tail 25 ; width of hand 5*5 ; 



length of 



underhand 5, 



of movable finger 5*5. 



S . Total length 51, carapace 6-2, tail 29. 



Hah. Panama 6 . — Colombia; Venezuela; Guiana. 



The type of Broteas panamensis, Thorell, has been kindly submitted to me for 

 examination by Prof. Targioni-Tozzetti, of the Florence Museum. I was thus enabled 

 to establish its specific identity with specimens in the British Museum from Guiana, 

 from which the above-given description has been taken. 



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PLESIOCHACTAS. 



Plesiochactas, Pocock, Ann. & Mag. Nat. Hist. (7) v. p. 470 (1900). 



Carapace not narrowed anteriorly, truncate, with squared anterolateral angles; two lateral eyes on each side. 



Fingers of the chelce armed 



Movable finger of mandible with a row of small teeth on the inferior border, 

 with numerous minute teeth, forming two rows along the middle of their length and flanked on each side 

 by about half a dozen larger-spaced teeth. Sternum of cephalothorax wider than long. Pectines with the 

 shaft distinctly and normally segmented and distinct fulcra. Segments of the tail and last abdominal 

 sternum furnished beneath with a single median inferior keel. Tarsi furnished beneath with two rows 

 of slender bristles. 







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Type. Species represented by specimen described as P. dugesi, wbich probably equals Megacormus granosus, 



var. dilutus, Karsch . 



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Distribution. Mexico. 



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