1873.] MR. A. G. BUTLER ON THE GENUS ACROSOMA. 425 



32. ACROSOMA DIFISSUM. 



Plectana difissa, Walckenaer, Apt. ii. p. 181. n. 47 (1837-39). 



Acrosoma bifurcatum, Koch, Arachn. vi. p. 124, pi. 209. f. 521 

 (1839). 



Var. Acrosoma gilvulum, Koch, Arachn. xi. p. 67, pi. 376. f. 886 

 (1845). 



" Brazils " (Koch) ; Columbia (Goudot). B.M. 



33. Acrosoma lucasii. 



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

 p. 68, pi. 2. f. 1 (1863, edit. 1864). 

 " Bogota " (Keyserling). 

 I doubt if this is distinct from A. difissum. 



34. Acrosoma flabellatum. 



Plectana fiabellata, Walckenaer, Apt. ii. p. 192. n. 65 (1837-39). 

 " South America" (Walckenaer). 

 Seems to come very close to A. difissum. 



35. Acrosoma swainsonii. 



Acrosoma swainsonii, Koch, Arachn. vi. p. 121, pi. 209. f 519 

 (1839). 



"Brazils" (Koch) ; sp. ead. ? Columbia (Goudot). B.M. 



36. Acrosoma gracile. 



Epeira gracilis, Walckenaer, Tabl. des Aran. p. 65. n. 50; Hist. 

 Nat. des Araign. iii. pi. 5 ; Apt. ii. p. 193. n. 66 (1837); Abbot's 

 Georgian Spiders, f. 47 & 48. 



Georgia. B.M. 



37. Acrosoma crassum. 



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

 p. 78, pi. 2. f. 11 (1863, edit. 1864). 



Bogota (Goudot). B.M. 



38. Acrosoma pictum. 



Acrosoma pictum, Koch, Arachn. iii. p. 61, pi. 3. f. 214 (1836). 

 Columbia (Goudot). B.M. 



39. Acrosoma de geerii. 



Plectana de geerii, Walckenaer, Apt. ii. p. 174. n. 36 (1837). 

 Aranea spinosa, var., De Geer, Ins. vii. p. 322. 

 "Surinam" (Walckenaer). 

 Seems nearly allied to A. pictum. 



40. Acrosoma alatum. 



Plectana alata, Walckenaer, Apt. ii. p. 193. n. 67 (1837-39). 

 " Province of St. Catharine, Brazil " (Walckenaer). 

 Allied to A. pictum. 



