1873.] MR. A. G. BUTLER ON THE GENUS ACROSOMA. 423 



19. ACROSOMA RUBICUNDULUM. 



Acrosoma rubicundulum, Keyserling, Sitzungsber. der Ms zu 



Dresden, p. 74, pi. 2. f. 7 (1863, edit. 1864). 

 " Bogota " (Keyserling). 



Belongs to the A. armigerum group. 



20. ACROSOMA PUNGENS. 



Plectana pungent, Walckenaer, Apt. ii. p. 173. u . 35 fl 837V 

 Keyserling, Sitzungsber. der Isis zu Dresden, pi. 2. f. 5 0863) 

 "Cayenne" (Walckenaer). l l ;< 



A broad species, somewhat like A.flaveolum in form, but spined 

 more like A. armigerum. »j»ura 



21. ACROSOMA BICOLOR. 



n »T?fS, K T er]in& Sitzungsber. der Isis zu Dresden, 

 p. 73, pi. 2. f, 6 (1863, edit. 1864). 



"Bogota" (Keyserling); sp. ead. ? Venezuela (Dyson). B.M. 



22. ACROSOMA MILITARE. 



Aranea militaris, Fabricius, Ent. Syst. ii. p. 416. 



Plectana militaris, Walckenaer, Apt. ii. p. 174.11 37C1837) 



South America. v J% 



ha^tu S r , ;tae a s'. Cle ° Ser ' *" •"*' reSe "" bleS * •*— * bu < 



23. ACROSOMA RUBROCINCTUM, n. Sp. 



Cephalothorax truncate in front and prominent, depressed and 

 expanded behind, with central transverse quasi-suture ; abdomen 

 trapezoidal, sinuated m front, and bearing two short obtuse spines 

 one on each anterior angle, projecting slightly on either side of the 

 cephalothorax; two strong subcorneal widely divergent acuminate 

 spines directed obliquely from each posterior angle ; "ventral surface 

 longitudinally wrinkled Length of abdomen 2 lines ; width at widest 



posterior ;] e hne ntire ** H "^ anteri ° r SpineS * ° f a line « 

 Colours Cephalothorax, falces, maxillw, and legs reddish cas- 

 taneous labium pale castaneous, sternum pitchy: abdomen above 

 brownish olivaceous, encircled by reddish castaneous including spines • 

 below black with an orange spot on each side of the spfnnerets ;' 

 spines reddish castaneous. v ' 



Brazil. One specimen. jj M 



A small and obscure species of the P. crassispinum group. 



24. ACROSOMA RUFOPUNCTATUM, n. sp. 



Cephalothorax as in preceding species ; abdomen trapezoidal, with 

 two short obtuse spines one on each anterior angle, projecting 

 obliquely outwards on either side of cephalothorax j two strong sub- 

 conical widely divergent acuminate spines directed obliquely out- 

 wards from each posterior angle, and nearly horizontal; ventral 

 surface concentrically wrinkled. Length of abdomen 2 lines ; width 



