254 ARANEIDEA. 
evidently some variation in the abdominal markings of this species. I have, since describing the above, 
come across another example in which the large white patch is scarcely defined, but in front of it is a 
large black one. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Theridion rotundum, sp. n. 
Adult female, length 2 lines. 
This spider is of the Theridion denticulatum, Walck., group. 
Cephalothorax inversely heart-shaped, ending before in a rather drawn-out or an obtusely rounded form ; 
lateral marginal impressions slight, the whole length not greatly exceeding the width of the widest part 
at the thoracic junction; the posterior margin very hollow, truncate. The clypeus is prominent on the 
lower margin, and its height exceeds half that of the facial space. Colour yellow-brown, suffused or 
finely marked, mostly on the sides, with dark brown, and the normal converging grooves indicated by 
indistinct darker yellow-brown lines. 
Eyes in two transverse rows not greatly different in length, and occupying the whole of the width of the 
caput; posterior row not greatly curved, the convexity of the curve directed backwards. The anterior 
row does not extend so widely as the posterior row, and so might be taken to be the shortest; but as 
it is much more strongly curved in an opposite direction, it is probably the longest ; when, however, 
looked at sideways, the curves are equal. The eyes of the posterior row are equidistant from each 
other, though perhaps the centrals may be slightly further from each other than from the laterals. The 
fore-centrals are considerably further from each other than from the fore-laterals, and are seated on an 
obtuse prominence of the caput; those of each lateral pair are seated on a strongish tubercle, and 
slightly obliquely. The fore-centrals are largest of the eight. The central quadrangle is narrower 
behind than in front, and the anterior side is longer than the length of the quadrangle. 
Legs short, brownish-yellow, 1, 2, 4, 3, indistinctly annulated with yellow-brown, furnished with hairs only. 
Falees, maxille, and labium similar to the cephalothorax in colour. 
Sternum longer than broad, its hinder extremity obtusely pointed ; colour yellow-brown, suffused with blackish, 
mostly towards the margins and hinder extremity. 
Abdomen large, globular, thickly covered with almost coalescing white irregular spots; with a tapering, not 
very distinctly outlined, brownish-yellow, central median dentated band, with an indistinct whitish 
margin; on this band, which reaches to the spinners, are the normal dusky brown lines along the region 
of the dorsal vessel, and on the sides are several indistinct oblique yellow-brownish stripes. The spinners 
are short, compact, and placed on a black patch, and between them and the genital aperture (which is of 
a simple transverse-oval form) is a largish white spot. 
Hab. Mexico, Patzcuaro (H. H. Smith). 
Theridion morulum, sp. n. 
Adult female, length 13 lines. 
Cephalothorax of ordinary form, of a dull orange-yellow colour, narrowly margined with dark brown, a 
short longitudinal central dark brown bar on the caput. 
Eyes of tolerable and nearly equal size; in two transverse rows of almost equal length, and very nearly equally 
curved, though in opposite directions, the convexity of the anterior row being directed forwards, that of 
the posterior row backwards. The interval between the hind-central pair is equal to a diameter, and these 
are distinctly nearer together than to the hind-laterals, while that between the fore-centrals is a little greater 
than between each and the fore-lateral eye next to it. The four centrals form a square; those of each 
lateral pair are contiguous and placed slightly obliquely on a not very strong tubercle. The height of the 
clypeus exceeds half that of the facial space, and its lower margin is prominent. 
Legs rather short and slender, 1, 4, 2,3. Similar in colour to the cephalothorax and sparsely annulated with 
dark yellow-brown, furnished with hairs and a few slender erect bristles. 
Falces rather long, not very strong, similar to the cephalothorax in colour. 
Mazille and labtum yellow-brown. 
