TURCKHEIMIA.—CYCLOSA. 269 
projects greatly over the base of the cephalothorax, and the hinder extremity is produced beyond the 
spinners, so that the length from them to the extremity considerably exceeds the length to the base of the 
cephalothorax, the spinners being nearly about halfway between the two extremities. At the middle of 
the fore extremity is a somewhat tuberculiform blunt-pointed prominence ; behind this on each side, 
about a third or less of the distance to the hinder end, is a conical prominence, and the hinder extremity 
is divided into two large, lateral, somewhat rounded, conical, slightly divergent prominences, between 
which are two others distinctly smaller, or rather a large one cleft in two by a transverse cleft. These 
terminal prominences are pretty thickly clothed with short bristly hairs. The colour of the abdomen is 
a mixture of dull yellowish-brown, whitish-yellow, and black, in spots, short lines, and irregular markings, 
the most conspicuous on the upperside being four black patches in a somewhat quadrate form behind 
the anterior lateral prominences ; the underside of the two large terminal prominences is black, as also 
are the spinners and an irregular space round them. The anal prominence is very distinctly segmentate. 
The genital process is small, placed on a large transverse prominence, and its form and structure are 
very distinctively characteristic; on each side beneath the abdomen, between the genital process and 
the spinners, is a small but distinct tuberculiform prominence, white towards the outer side, black on the 
inner side. 
Hab. Costa Rica, San José (J. F. Tristan & P. Biolley, ex Sarg). 
This spider is nearly allied to 7. walckenaervi, Cambr., antea, p. 47, t. 8. figg. 6, and 
T. diversa, Cambr., antea, p. 136, t. 16. figg. 11; it is, however, of a much longer form 
than 7. walckenaerti, and the shape of the abdominal prominences is different 
from those of 7’. diversa, as also are the respective genital processes of all three species. 
T. walckenaerii is most probably identical with a species subsequently described by 
Keyserling as Epeira walckenaerti (Die Spinnen Amerikas, Epeiride, Bd. iv. 1892, 
p. 98, t. 5. fig. 85), and till then considered by him to be petra bifurcata, Walck. 
Whether the genus Zurckheimia, as based upon T. nodosa, Cambr. (antea, p. 46, t. 4. 
figg. 11), is a good one or not is perhaps uncertain; it may possibly be found to run 
into Cyclosa through T. walckenaerit, T, diversa, and the present species. M, Simon, in 
his ‘ Histoire des Araignées,’ sinks this as well as Cyclosa, Cambr., ad partim, and 
between twenty and thirty other hitherto recognized genera or parts of genera, into 
one generic group, under Araneus, Clerck (= petra, Walck.), thus bringing together 
an enormous and remarkably heterogeneous group, almost as though it were intended 
as a kind of refuge for destitute Epeirids, for which the author was not quite prepared 
to find any definite position elsewhere. 
CYCLOSA, Menge. 
Cyclosa tuberculifera, sp. n. 
Adult male, length 1} lines. 
This species is very closely allied to the well-known European form Cyclosa conica, Pallas, resembling it 
nearly in general form, colours, and markings; it is, however, but little more than half the size of that 
species. ‘The caput is less drawn out, and the fore-central eyes are on a shorter prominence; the posterior 
prolongation of the abdomen is smaller and has a more tuberculiform appearance, and the palpal organs 
are quite differently constructed. 
Cephalothorax dark brown, clothed thinly with greyish and other hairs, 
Legs furnished with strongish spines. Colour yellow, inclining to orange-yellow on the tibiae, tarsi, and 
metatarsi; the anterior portion, exceeding half, of the femora of the first and second pairs black-brown ; 
