744 MR. F. 0, PICKARD CAMBRIDGE ON [June 16, 
One would be inclined to consider that possibly a separate species 
is in process of differentiation, and that the further westwards it 
extended the more decided might be the differential characters. Of 
course this is only a theory, as regards the latitudinal distribution 
of the forms, which would be at once upset by grizzled specimens 
from Para, for instance. The difference, however, is so striking, 
that one would not hesitate to regard the grizzled form as 
decidedly a different species from the red, when alive in all the 
fresh beauty of its grey-green colouring; until careful comparison 
proves that the difference is, so far, but one of coloration, having 
apparently no structural counterpart. 
Species which probably belong to the genus Avicularia. 
1848. Mygale hirsutissima, C. K., 2, Die Arachn. ix. p. 76. 
South America. In coll. J. Sturm, Nurnberg. 
1848. Mygale leporina, C. K., 3, Die Arachn. ix. p. 55. Bahia. 
Mus. Berlin. 
1848. Mygale diversipes, O. K., 9, Die Arachn. ix. p. 60. 
Brazil. Mus. Berlin. 
1848. Mygale leta, C. K., 2, Die Arachn. ix. p. 66. Porto 
Rico. Mus. Berlin. 
1848. Mygale cesia, C. K., 9, Die Arachn, ix. p. 88. Porto 
Rico. Mus. Berlin. 
1848. Mygale detrita, C. K., g, Die Arachn. ix. p. 86. Brazil. 
Mus. Munich. 
1848. Mygale walckenaerii, Perty, Del. An. Artic. p. 191, t. 38. 2. 
Brazil. 
1871. Avicularia vulpina, Auss., Verhandlungen &c., Wien, 
1871, p. 202. Brazil. 
1876. Avicularia rutilans, Auss., 6, Verhandlungen &c., Wien, 
p. 184. New Granada. 
1876. Avicularia metallica, Auss., Verhandlungen &c., Wien, 
p- 185. Surinam. 
1889. Avicularia velutina, Sim., 2, Ann. Soc. Ent. Fr. 1889, 
p- 213. Venezuela. 
1890. Avicularia holmbergii, Thor., Ann. Mus. Genov. (2) viii. 
p- 399. Hab.? 
1891. Avicularia glauca, Sim., g, Ann. Soc. Ent. Fr. 1891, 
p- 312. Panama. 
Genus Taprnaucnuntivs, Ausserer, 1871. (Plate XXXIV. fig. 21.) 
Syn. 1842. Mygale, C. Koch, Die Arachniden, ix. p. 67. 
1850. Eurypelma, C. Koch, Uebersicht. 
Type. 7. plumipes (C. K.), 3d, Die Arachniden, ix. p. §7, 
tab. ecexi. fig. 733, 1842. In coll. Mus. Imp. Berlin. 
Generic Characters. 
Anterior row of eyes straight or nearly so. Legs of first pair equal 
to those of the fourth. Three pairs of sternal sigilla visible—lst at 
