DESCRIPTION OF GENERA AND SPECIES. 275 



diameters or more; side eyes widely separated, the space between them beinj? at least half 

 greater than that which separates SF and MF (3b) ; the distance between SR and MR is 

 scarcely as great as that between MR; the front row distinctly procurved, the rear row 

 much recurved. 



LEGS: 1, 4, 2, 3; stout, especially at the femora of legs-I and IV; color yellow, with 

 brown and blackish brown median and apical annuli ; the femora almost completely dark- 

 ened ; the metatarsi long, and on the fourth leg (3d) curved and provided with a calamis- 

 truin. The legs have short pubescence and fine bristlelike spines; tibia-I is thickened and 

 has an apical brush, to which the species owes its name. The palps are colored and armed 

 as the legs. 



ABDOMEN : An elongated oval, thickest at the base, which is bifid and overhangs the 

 cephalothorax ; it is there provided with two low shoulder humps ; the dorsum is arched 

 to the spinnerets, which are distal and provided with a cribellum (3e) ; the color is yellow 

 or cretaceous, reticulated and marked with blackish brown median stripes with divergent 

 branches to the sides, which are streaked with black and yellow. In some specimens 

 (Fig. 4) the colors appear to be reversed and the field black, while the folial markings are 

 yellow. The venter is a broad band of yellowish brown with an indented border of creta- 

 ceous, which surrounds in a broken line the spinnerets, which are yellow flecked with 

 brown ; the epigynum (3c) shows two rounded conical projections from the atriolum of a 

 light yellow color, overhanging and projecting beyond the genital cleft. The male (Fig. 5) 

 is colored _and marked like young females (Fig. 4). 



MALE: Total length, 2.5 to 3 mm. The cephalothorax is more roundly ovate than the 

 female. The eyes (PI. XXVIII, 6a) differ little in arrangement, but the front row rather 

 shorter relatively. The legs are yellow, femur-I being darker, and others with light 

 median and apical annuli underneath. The tibia of the first pair bearing upon the 

 upper surface a double row of spines on one side long and yellow, on the other shorter 

 and blackish, and eight to nine in number; other joints with a few yellow spines. The 

 two terminal joints are decidedly thinner than the others. The metatarsus is as long as 

 the tibia; the fourth pair of legs without calamistruni. The abdomen is without humps, 

 is an elongated oval, blackish in color, and the folium irregularly traced by long grayish 

 yellow hairs; the entire surface is hairy. The color of the cephalothorax is dark brown, 

 with a median line of yellowish marked by long gray hairs. The palps are short, the 

 digital joint large, globular; the radial and cubital joints are of nearly equal length; a 

 short blunt spur projects outwardly from the humeral joint (PI. XXVIII, 6b) ; the cymbium 

 covered with reddish yellow hairs. (Marx Collection.) 



DISTRIBUTION : I have taken this spider in New England, Pennsylvania, and Ohio ; 

 Hentz described it from Alabama, and I have various specimens received from the Pacific 

 Coast. It is probably distributed throughout the entire United States. 



GENUS HYPTIOTES, WALCKENAER, 1833. 



But one American species of this remarkable genus is known, whose characteristics are 

 so striking that it cannot be easily mistaken. The cephalothorax is an oval with steep 

 sides, truncated at the base, which shelves sharply downward from the fosse. The corselet 

 is overhung behind by the vaulted abdomen, and almost overshadowed in front by the 

 peculiar structure of the face. The sternum is cordate, decidedly longer than wide, 

 widest at the base, with distinct sternal cones. The labiuni is small as compared with the 

 maxillae, compressed at the base and triangular at the tip, the length about half that of 

 the maxillae, which are somewhat longer than wide, compressed at the stalk, and much 

 widened at the squarely truncate tips. The eyes are arranged in two rows, of which the 

 front is strongly procurved, and the rear row, at least 2.5 times as long as the front, is 

 slightly procurved. The two sidefront eyes are very small and placed close to the margin 



