Genera of S.- American Aviculariide. 545 
the apex of the lower spur on the tibia, without touching the 
upper spur. 
The different distribution of Z. Klugii as compared with 
the other species hitherto referred to Lastodora is to be borne 
in mind. 
Genus PHORMICTOPUS, nov. 
Resembling Acanthoscurria in the presence, position, and 
structure of its stridulating-bristles upon the trochanter of 
the palp and first leg ; but with an additional cluster of clavate 
plumose bristles above the suture on the coxa of the first legand 
in a corresponding position upon the posterior side of the coxa 
of the palp; also like that genus in the hairiness of the 
summit of the rostrum, and other structural characters, except 
that in the male there are two normal tibial spurs on the 
first leg and no spurs on the tibia of the palp. 
The two species I refer to this genus were included by 
Ausserer in Lastodora of Koch, and both fall into that genus 
as diagnosed by Simon; but they differ from all the other 
species in having the stridulating-bristles on the trochanter 
of the palp and first leg. They further differ from Laszodora 
(sensu stricto), and from that section that I call Pamphobeteus, 
in that the protarsus of the first leg in the male closes on 
the outer side of the lower tibial spur—a feature in which they 
agree with the one known species of Megaphobema. 
The type of this genus is the species represented in the 
British Museum by specimens from Haiti, identified as 
Mygale cancerides, Latreille*, which I believe to be the 
oldest name for the spider called Hurypelma Krichsonit by 
Koch. 
Lasiodora cauta, Auss., also falls into this genus. 
Genus PAMPHOBETEUS; nov. 
Differing from Lastodora, as typified by L. Klugit, in having 
no stridulating-bristles on the anterior side of the coxa of 
the first leg and on the posterior side of the coxa of the palp 
and no scopula on the inner side of the femur of the first leg. 
Protarsus of first leg in male closing between the tibial 
spurs, thus coming into contact with the inner side of the 
lower spur and the outer side of the upper spur. Femur of 
third leg not thickened ; patella+ tibia of fourth only slightly 
longer than of first, which, at least in the female, falls short 
* Mygale cancerides, Latreille (Gen. Crust. et Ins. i, p. 83, 1806), 
was originally recorded from St. Domingo (Haiti), 
Ann, & Mag. N. Hist. Ser, 7. Vol, Vill, 38 
