754 ME. !•. o. noKABD OAMBBiDGB OK [June 16, 



lati." "Tibiffl quatuor anticsB inferne aculeis setiformibus 3 — 3, 

 metatarsi aculeis validioribus 3 — 3 instructi, pedes postici nume- 

 rose aeuleati." " MamilliB fusco annulatce." " Long, ceph. + abd. 

 13-5 mm." 



There is very little doubt, sbort of actual comparison of types, 

 as to the identity of //. auricomis, Sim., with my female adult 

 specimen from Santarem and with the immature females from 

 Gurupii. The males have not hitherto been described, but the two 

 obtained on the Lower Amazons undoubtedly belong to the females 

 taken at the same time. 



Genus DiPLUEA, C. Koch ; E. Sim. 



Type. Mijgale macrura, C. K. ( d , 6-5 mm. long), Die Arach- 

 niden, ix. p. 38, tab. ccc. fig. 715 (1842). Ilab. San Juan, West 

 Indies. In coll. Impr. Mus. Berlin. 



The genus Biplura was founded in 1850, 'TJebersicht dea 

 Arachn.,' C. L. Koch, p. 75. The author says of the type, 

 D. macrura, "■ Sehr gerade ausstehende Sjainnwarzen," and in his 

 description of the same spider under Mycjale he says " Kopf und 

 Thorax rostgelb" — "Der Hinterleib sammt den Spinnwarzen 

 braunschwarz," 



The figure on plate ccc. seems to suggest that this species is 

 closely allied to that described below as D. sanguinea, but the 

 unicolorous abdomen would prove it to be certainly a different 

 species. Not having seen the type of the genus, which apparently 

 is still extant in Berlin, and feeling pretty sure that it will prove 

 not congeneric with the three species described below, I have con- 

 sidered it less liable to lead to confusion in the future to form two 

 new genera for their rece])tion. Two of them, Mdodeiis sanguineus 

 and Al. nigei; might possibly fall under Simon's group A, wliile the 

 third, Ilarmonicon rufcscens, would fall under group B (t/. Hist. Nat. 

 Ar. i. p. 178, 1892). If, however, group A really corresponds, as 

 M. Simon suggests, to Bertkau's genus Thaler othele, then mine will 

 not fall into the group, for of Th. fasciata, Bert., the type of the 

 genus, Bertkau says " scopula nulla"; whereas all these three species 

 possess very distinct scopulse on the tarsi of all four pairs of legs. 

 It is just possible, however, that Bertkau's type may be immature, 

 in that case the scopula would probably not be developed ; but of 

 this I cannot speak with certainty. 



Trechona ' is undoubtedly a good genus, the tarsi and protarsi 



' Genus Tueoiiona, 0. Koch. 



Typo. Treehona zebraia (Walck.), 1835, sub Mygale ($). In coll. Brit. 

 Mue. Nat. Hist. 1896. 



Anterior eyes almost equal, forming a slightly curved line, almost straight. 

 Carapace a little raised behind the oye-tumulus. Posterior spinners one-half 

 shorter than abdomen ; segments Bubeqiial. Lege long, robust ; protarsi and 

 tarsi i. and ii. entirely and densely scopulate, the former with three or four 

 long spines lying amongst the ecopulee ; the latter without any central series of 

 long sotto amidst the scopuhK. Protarsua iii. with distal two-thirds, tarsus iii. 

 entirely, densely scopulate. Protarsue iv. with distal half and entire tarsus iv. 



