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Show 754 MR. P. O. PIOKARD CAMBRIDGE ON [June 16 lati." "Tibia? quatuor anticae inferne aculeis setiformibus 3 3 metatarsi aculeis validioribus 3 - 3 instructi, pedes postici nume-rose aculeati." " Mamillae fusco annulatae." " Long, ceph.+abd. 13-5 mm." There is very little doubt, short of actual comparison of types as to the identity of H. auricomis, Sim., with my female adult specimen from Santarem and with the immature females from Gurupa. 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 DIPLURA, C. Koch; E. Sim. Type. Mygale macrura, C. K. (cJ, 6*5 mm. long), Die Arachniden, ix. p. 38, tab. ccc. fig. 715 (1842). Hab. San Juan, West Indies. In coll. Impr. Mus. Berlin. The genus Blplura was founded in 1850, ' Uebersicht des Arachn.,' C. L. Koch, p. 75. The author says of the type, D. macrura, " Sehr gerade ausstehende Splnnwarzen," and in his description of the same spider under Mygcde 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. sangulnea, 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 considered it less liable to lead to confusion in the future to form two new genera for their reception. Two of them, Melodeus sanguineus and M. niger, might possibly fall tinder Simon's group A, while the third, Harmonicon rufescens, would fall under group B (cf. Hist. Nat. Ar. i. p. 178, 1892). If, however, group A really corresponds, as M . Simon suggests, to Bertkau's genus Thalerothele, 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 scopulae 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. Trechonal is undoubtedly a good genus, the tarsi and protarsi 1 G-enus TRECHONA, 0. Koch. Type. Trechona zebrata (Walck.), 1835, sub Mygale (2)- In coll. Brit. Mus. Nat. Hist. 1896. Anterior eyes almost equal, forming a slightly curved line, almost straight. Carapace a little raised behind the eye-tumulus. Posterior spinners one-half shorter than abdomen; segments subequal. Legs long, robust; protarsi and tarsi i. and ii. entirely and densely scopulate, the former with three or four long spines lying amongst the scopulae; the latter without any central series of long setae amidst the scopula. Protarsus iii. with distal two-thirds, tarsus iii. en,tirely, densely scopulate. Protarsus iv. with distal half and entire tarsus iv. |
