264 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 



also to be decidedly curved ; that is to say, arched upon the basal half and curving down- 

 ward to an equal thickness of the apical half. 



DISTRIBUTION: T. laboriosa has been collected from New England southward to Florida 

 and Texas, and on the Pacific Coast as far north as the British possessions. It doubtless 

 dwells in the entire United States. 



GENUS EUGNATHA, SAVIGNY and ATJDOUIN, 1825. 



The genus Eugnatha in its general characteristics resembles Tetragnatha. It is distin- 

 guished therefrom especially by the position of the side eyes, which in Tetragnatha are 

 rather closely approximated, being at least nearer to one another than are the midrear and 

 midfront eyes. In Eugnatha the side eyes are widely separated, much more so than the 

 eye rows of the middle group. The genus is distinguished from Eucta by the fact that the 

 abdomen does not extend beyond the spinnerets into a caudal apex. 



No. 110. Eugnatha vermiformis (EMERTON). Plate XXV, Fig. 9. 



1884. Tetragnatha rermiformis, EMERTON, N. E. Ep., 333, xxxix., Figs. 12-14. 



1889. Tetragnatha vermiformis, McCooK . Amer. Spid. and their Spinningwork, Vol. I., p. 160. 



1889. Eugnatha rermiformis, MARX . . . Catalogue, p. 552. 



1893. Eugnatha rermiformu, BANKS . . Jour. N. Y. Entom. Soc., i., p. 131. 



FEMALE: Total length, 11 mm.; cephalothorax, 3 mm. long, 2 mm. wide; abdomen, 

 8.7 mm. long, 2.6 mm. wide, diminishing to 1.3 mm. 



CEPHALOTHORAX : Elongated oval, truncated at the base ; the fosse a low circular depres- 

 sion; cephalic suture distinct; corselet grooves indistinct; color brown, with yellow bands 

 along the sides, sparsely covered with yellowish pubescence. Sternum yellowish brown, 

 with a lighter median band; the centre raised and flattened; sternal cones not prominent. 



EYES : Ocular quad elevated in front alone, MF being upon a rounded elevation ; longer 

 than wide, the rear wider than the front; MF somewhat smaller than MR, separated by a 

 little more than one diameter; MR by 1.5 or more. The side eyes about equal in size to 

 MF, separated more widely than MF, but not relatively so much as in Eucta; SF from MF 

 by about twice the interspace of the latter; the distance between SR and MR relatively 

 somewhat less than the above. Clypeus height equal to about twice the diameter MF ; the 

 front eye row aligned, the rear row recurved. 



LEGS: 1, 2, 4, 3; rather strong, armed with long aculeate bristles and short yellowish 

 hairs, with a few. thin spines. Color uniform yellow. Palps colored and armed as the legs. 

 The mandibles project from the face at an angle of about forty-five degrees; are almost 

 straight on the exterior edge; 1.7 mm. long; widest about the middle, concave on the 

 interior margin, color yellow ; fangs dark, glossy brown ; scarcely or barely extending to the 

 maxillae; a slight tooth marks the outer surface near the base. The interior furrow has two 

 teeth on the apex near the insertion of the fang, and about eight farther along the furrow, 

 of which the third and sixth are the longest. 



ABDOMEN: Thickened at the base, bifid in front, cylindrical, four to five times as long 

 as wide, color yellow, with golden reticulations. (Figs. 9-9a.) The spinnerets are just below 

 the apical wall, which projects a very little. The epigynum is a small arched hood, without 

 scapus. The form of the abdomen differs from the above at times (9b), the width being 

 almost equal throughout and curved, giving a decided vermiform appearance. 



MALE: Closely resembles the female. The radial joint of the palps is not longer than 

 the cubital ; the mandibles are shorter than the cephalothorax. 



DISTRIBUTION : This species has been collected in New England, in New York (Banks), 

 and as far west as Utah (Marx), and my specimens are from Wisconsin (Professor Peck- 

 ham). It is thus probably distributed throughout the entire United States, at least east of 

 the Rocky Mountains. The young of this species were discovered by me navigating the 

 waters of Deal Lake, New Jersey, by means of filiform sails, as described in Vol. I., page 160. 



