some South- American Aviculariidge. Ill 



scopula, and two at its apex. Tibial spurs of first sub- 

 cylindrical, longisli, the lower with a subapical superior spine, 

 the upper with a spine lying along its lower surface. Palp 

 with four inner tibial spines ; palpal organ with its spines 

 short and very robust, abruptly narrowed and pointed at the 

 tip, with a strong spiral crest. 



Measurements in millimetres. — Total length 14; carapace 6; 

 first leg 19, second leg 18, third leg 16, fourth leg 21 j 

 patella + tibia of first 7*3, of fourth 6'5. 



Loc. Caras, in Peru (P. 0. Simons), 



In the banded coloration of its abdomen this species 

 resembles H.formosus, Auss. (Verb. z.-b. Wien, 1875, p. 177, 

 ])1. vi. figs. 17, 18), from Bogota, and II. pentaloris, Simon 

 (F. Cambr. Biol. Centr.-Amer., Araneidea, ii. p. 31, 1897), 

 from Guatemala, &c. It may he distinguished from both by 

 having the keel on the palpal spine not rising into a large 

 compressed tooth. 



Genus HoM(EOMMA, Auss. 



IIo7nceo7nma Ausserer, Verb. z.-b. Wien, 1871, p. 210 (nee Homceomma, 



Sim.). 

 ? Agathostola, Simon, Hist. Nat. Araigu. i. p. 163 (1892). 



In his diagnosis of the genus Simon says : — '' Calcares 

 \_sic\ tibiales maris sat graciles et subacuti, inferior longior 

 et arcuatus ; bulbus angustus, usque ad basin teretiusculus, 

 baud carinatus, apice simpliciter tenuissimus." 



Asa matter of fact, the tibial spurs are almost exceptionally 

 strong, and the spine of the palpal organ is broad, blade-like, 

 and bent almost at right angles with a spiral twist (see figures 

 published by Koch, Ausserer, and Cambridge). Ausserer's 

 diagnosis may be supplemented as follows : — 



The bulb of the palpal organ is furnished above with an 

 upwardly-directed process. The protarsus of the first leg 

 closes between the tibial spurs. There is no stridulating-organ 

 of plumose bristles between the basal segments of the first 

 leg and the palp, these segments being clothed with simple 

 hairs or bristles ; protarsus of third leg apically scopulate, of 

 fourth not or scarcely scopulate. 



TijjJe. Species represented by specimens identified by 

 Ausserer as Earypelma versicolor ^ C. Koch. 



The synonymy of the type of this genus is, I believe, as 

 follows : — 



Homceomma nigrum (Walck.). 

 Myyale nigra, VValckenaer, Ins. Apt. i. p. 214 (1837). 

 Mygale {Eurijpelmu) versicolor, C. Koch, Die Arachn. ix. p. 57, fig-. 727 

 (1842) (nee versicolor, Walck.). 



