Tertiary Spiders and Opilionids. 259 



The sternum, represented in our textfti^iire 26, is wide in front, 

 pointed behind, scarcely separating the hind coxse. It is sHghtly 

 emarginate anteriorly, receiving the wide underlip at the sides of 

 which the maxillary lobes may be seen. They are more or less 

 typical of Tetragnatha being considerably wider at the end than 

 at the base and in a general way parallel to each other. 



In front of the maxillary lobes the chelicerse may be plainly 

 seen. They have been probably pressed out of their position as 

 their base is now in contact with the anterior edge of the max- 

 illary lobes, a circumstance which misled Scudder in his interpre- 

 tation of these structures. The chelicerse are comparatively short 

 and stout and strongly divergent. The left shows the fang com- 

 plete. It is a little shorter than the basal joint, lighter in color, 

 smooth and slightly but evenly curved. Considering that the 

 specimen is unquestionably a male the cheliceras are not typical, 

 or perhaps I should better say not of the extreme type found in 

 some recent species of the genus, but more of the type of the 

 recent female Tefragiiaflia laboriosa. Imjiressions of the copu- 

 latory apparatus of the pedipalpi may l)e seen at a little distance in 

 front of the chelicene, Init the other joints of the pedipalp, which 

 probably was slender, are not discernible. 



The carapace is clearly visible on the specimen No. 5000 (now 

 No. 62). Its anterior edge extends a little beyond the base of the 

 chelicerae, cutting them across. I have mentioned that the cheli- 

 cerse are apparently dislocated. The median line of the carapace 

 comes to lie not between the chalicerse, but slightly to the left, so 

 that of the eyes which are plainly impressed across the base of the 

 chelicerse the right median eye lies in the juncture line of the 

 two chelicerse. The carapace is anteriorly narrower than poste- 

 riorly. Its widest place is between the second and third pair of 

 coxse where it measures 2.6 mm. while the length of the carapace 

 is 3.5 mm. It is therefore distinctly longer than wide and oval in 

 shape. Between the posterior edge of the carapace and the ante- 

 rior edge of the abdomen a narrow space is bridged by the petiolus 

 which has the shape of an elongated pentagon with the apex 

 reaching the sternum and with sides slightly concave. Measured 

 without the petiolus the abdomen is 4.6 mm. long and 2.3 mm. 

 wide. The total length of the spider including chelicera is 10 mm. 



The two rows of eyes are very slightly recurved and the poste- 

 rior row slightly longer than the anterior row. All eyes are round 



