DESCRIPTION OF GENERA AND SPECIES. 197 



GENUS ORDGARIUS, KEYSERLING. 



The most striking distinctive characteristics of this genus are found in the eephalo- 

 thorax. The corselet is rounded at the margin, but rises with almost perpendicular walls 

 to the crest. The base is sharply truncated, sloping rapidly upward to the crest. The skin 

 is covered with many warts, particularly numerous and marked upon the caput and face. 

 The summit of the caput is distinguished by two castellated prominences, with strong 

 protuberances on either side. The Sternum is scutellate, somewhat longer than wide ; the 

 labium wide, rather low; the maxillae as in Epeira, scarcely as long as wide. The 

 eye rows are both much procurved; divided into two groups, as in Epeira; the central 

 quad upon a low rounded eminence rising at the base of the bossed forehead ; the pairs 

 placed close together, so that the side of the quad is much shorter than either the front 

 or rear. The side eyes are placed low down upon the face, on large rounded tubercles; 

 the eyes are all small, not greatly differing in size. The clypeus is very high, as is also 

 the forehead ; the middle eyes of the ocular quad are placed a little below the centre of 

 the face. The legs in order of length are 1, 2, 4, 3; stout, provided with bristles and 

 hairs, but without spines. The abdomen is subglobose, as wide as or wider than long, 

 and distinguished by two prominent shoulder humps. 



No. 54. Ordgarius cornigerus (HENTZ). Plate XII, Figs, l, la-d. 



1850. Epeira. cornigera, HENTZ . . . . J. B. S. 20; Id., Sp. II. S., p. 123, xiv., 8. 



1879. Cyrtarachne cornigera, KEYSERLING Neue Spin. Amer., i., Verhn. d. z. b. Ges. Wien, 



p. 300, iv., 4. 



1M7!>. Ci/rln rnchne bicurvata, BECKER . . Ann. Soc. Ent. Belgique, p. 77. 



1889. Cyrlarachne cornigera, McCooK . Amer. Spid. and their Spinningwork, Vol. II., 97. 



1889. Ordgnrius cornigerus, MARX . . . Catalogue, p. 541. 



1892. Ordgarius cornigerus, KEYSERLING. Spinn. Amerk., Epeir., p. 40, ii., 34. 



FEMALE: Total length, 12 mm.; abdomen, 8 mm. long, 8 mm. wide; cephalothorax, 

 5 mm. long, 4.5 mm. wide. The general colors of the fore part are red or reddish brown 

 and yellow, with dark brown markings. The abdomen is yellow, with dark or brownish 

 markings upon the front. 



CEWIALOTHORAX : Rounded at the margin, and rises with almost perpendicular walls 

 to the crest; the base sharply truncated; the skin covered with many warts, particularly 

 numerous and marked on caput and face; summit of the caput marked by two castellated 

 prominences, each with two strong tubercles on either side. The entire front of the 

 creature presents a peculiar appearance on account of the knobby or warted condition. 

 (Fig. Ib.) Sternum shield shape, somewhat longer than wide, has sternal cones, is rounded 

 in the centre, depressed at the base towards the labium, and sparsely covered with hairs; 

 in some species the color is yellow or dark brown ; in others dark brown. The labium 

 is triangular, rather low, but wide; the maxillse scarcely as long as wide; obtusely tri- 

 angular at the base ; color of labium and maxilla; brown, with yellow tips. 



EYES: The ocular quad (Fig. Ib) is upon a greatly elevated prominence; front shorter 

 than rear, and about equal to sides; MF somewhat larger than MR, separated by about 2.5 

 diameters or more ; MR separated by about three diameters, and divided by a longitudinal 

 notch ; side eyes separated by about a radius, not greatly differing in size ; set on tubercles, 

 with long bases that extend to the clypeus margin; both rows procurved; rear row longer; 

 clypeus high, twice or more the area of MF; on either side above the mandibles is a 

 rounded hump, much warted. 



LEGS : 1, 2, 4, 3 ; very stout, the femora and patella covered with yellowish bristles and 

 hairs, but without spines; color yellow, with dark brown apical and median annuli; palps 

 similarly colored and provided, quite wide and stout; mandibles conical, wide at the base, 



