424 MR. A. G. BUTLER ON THE GENUS ACROSOMA. [Apr. 1, 



at widest part 1\ lines ; entire length 2| lines; anterior spines \ of 

 a line ; posterior spines 1 \ line. 



Colours. Cephalothorax, falces, sternum, maxillae, and legs 

 reddish castaneous ; labium shining ochraceous ; abdomen above 

 olivaceous, encircled with orange and covered with red impressed 

 punctures, about thirty in number ; anterior spines orange, posterior 

 dark castaneous ; ventral surface olivaceous, with six large orange 

 spots arranged in a nearly equilateral triangle on either side ; spines 

 as above. 



Jamaica. B.M. 



Allied to the preceding species, and to A. guerinii of Keyserling. 



25. ACROSOMA GUERINII. 



Acrosoma guerinii, Keyserling, Sitzungsber. der Isis zu Dresden, 

 p. 79, pi. 2. f. 1 2 (1863, edit. 1864). 

 " Bogota " (Keyserling). 



26. Acrosoma sagittatum. 



Plectana sagittata, Walckenaer, Apt. ii. p. 174. n. 38 (1837) ; 

 Abbot, Georgian Spiders, f. 50. 



Georgia. B.M. 



27. Acrosoma crassispinum. 



Acrosoma crassispinum, Koch, Arachn. iii. p. 55, pi. 92. f. 209 

 (1836). 



"America" (Koch). ? B.M. 



28. Acrosoma gladiola. 



Plectana gladiola, Walckenaer, Apt. ii. p. 182. n. 51 (1837-39). 

 Acrosoma aculeatum, Koch (nee Fabr.), Arachn. iii. p. 58, pi. 93. 

 f. 211 (1836). 



Venezuela (Birschell). B.M. 



29. Acrosoma planum. 



Acrosoma planum, Koch, Arachn. iii. p. 81, pi. 99. f. 228 (1836). 

 Colombia (Goudot). B.M. 



30. Acrosoma acuto-spinum. 



Acrosoma acuto-spinum, Keyserling, Sitzungsber. der Isis zu 

 Dresden, p. 69, pi. 2. f. 2. 

 "Bogota" (Keyserling). 

 Probably not distinct from Acrosoma planum. 



31. Acrosoma triangulare. 



Acrosoma triangulare, Koch, Arachn. iii. p. 78, pi. 99. f. 226 

 (1836). 



Var. 1 Acrosoma eoccavatum, Koch, I. c. p. 80, pi. 99. f. 228 

 (1836). 



" Brazils " (Koch) ; sp. ead. ? Ecuador (Buckley). B.M. 



I doubt whether A. excavatum is identical with A. triangulare, 

 although Walckenaer has unhesitatingly called it a yellow variety. 



