THE FAUNA OF BOULDER COUNTY 255 



(117) Lithyphantes Thorell. L. corollatus (Linne). Boulder (cf. Thorell). 



(118) Steatoda Sundevall. S. distincta ThoTell. Ward. 



(119) Lathrodectes Walckenaer. L. mactans (Fabricius),* University campus and 

 Salina. This spider has the most extraordinary range, from the mountains of 

 Colorado down to the tropics. 



Family LINYPHIID.^ 



Allied to the last, but legs usually armed with spines; no comb on hind tarsus. 

 At base of mandibles on outer side is a striate or roughened area (Banks). 



(120) Linyphia Latreille. L. phrygiana Koch; Salina, April 14; cephalothorax light 

 yellow, with a black line in middle, forked at anterior end, abdomen yellow- 

 ish, with a median dark -brown or red stripe, the sides of which are deeply serrate. 

 L. marginata Koch*; University campus; colors light yellow and purplish-brown, 

 the abdomen with a series of large marks in the middle line, and lesser markings at 

 sides. 



Family TETRAGNATHID^ 

 Related to the Epeiridae, but mandibles large, strongly divergent; abdomen more 

 or less elongate. 



(121) Tetragnatha Latreille. Abdomen three or four times as long as broad. 

 T. grallator Hentz, varieties principalis (Thorell) and debilis (Thorell), Boulder 

 (cf. Thorell); T. lahoriosa Hentz* University campus; T. ex/ew^o (Linne),* Uni- 

 versity campus and Eldora. In the female of labor iosa, the cephalothorax is much 

 less than half length of abdomen; in extensa 9 it is about half as long as abdomen. 



(122) Pachygnatha Sundevall. P. auiumnalis Keyserling.* University campus. 



Family EPEIRTD.^ 

 These are the ordinary orb-weavers, spinning circular webs about buildings and 

 elsewhere. They are often of large size, with a very large, globular abdomen. 



(123) Epeira Walckenaer. E. gemma McCook,* University campus; E. dis- 

 plicata Hentz,* University campus; E. trivittata Keyserling (cf. Thorell); E. 

 carbonaria Koch, Eldora; E. aculeata Emerton, Eldora. 



(124) Argiope Audouin. Large spiders, more or less silvery, with the abdomen 

 transversely barred. A. aurantia Lucas,* University campus; A. trifasciata 

 Forskal {transversa Emerton),* University campus (Miss Edna Baker, Septem- 

 ber, 1906), and Eldora. 



Family THOMISID^ 

 The "crab-spiders," with the position of the legs and manner of movement more 

 or less crab-like. Some of the species live on flowers, and resemble in color the 

 flowers they frequent. 



(125) Xysticus Koch. X. cunctator Thorell, Boulder (cf. Thorell); X. gulosus 

 Keyserling,* University campus; X. gramineus Emerton,* University campus. 



(126) Mistunena Latreille. M. vatia (Clerck), Boulder (cf. Thorell) and Eldora. 

 Lives on flowers, and varies from white to deep yellow. 



