THORELL ON ARANE.E OF COLORADO. 525' 



apex being thickly black-haired. The legs are black, the posterior ones 

 more piceoiis, especially the under part of the coxre and the posterior 

 side of the hindmost thighs ; they are all covered,* though not very 

 thickly, with grayish- white appressed hair, as also 'with longer black 

 and whitish more erect hairs ; tbe spines are black. The back of the 

 abdomen is orange-red, with a longitudinal broad dark greenish or bronze- 

 colored middle band, stretching along the hinder two-thirds of its lengthy 

 and with a somewhat triangular patch of the same color in front of this^ 

 band, separated from it by a narrow red isthmus ; the red color forms- 

 two teeth in each margin of the band, one somewhat behind its middle^ 

 the other toward its apex, where the red color ends. The sides of the 

 abdomen, as also the belly, are black. Besides the appressed red hair 

 with which the back is clothed, it is strewed with longer whitish and 

 black hairs ; the belly has, along the sides, more backward, two lines 

 formed of whitish hairs and curved toward each other behind. The 

 vulva is dark brown, with two small oblong whitish spots in the bottom 

 close to its anterior extremity ; the mamillce are black. 



Length of body 14, of cephalothorax 5| millim.; breadth of cephalo- 

 thorax 4^ millim. Length of abdomen somewhat more than 9, breadth 

 of same 6 millim. Length of mandibles 2, breadth nearly 1^ millim. 

 Length of legs : I llj, II 10, III 9J, IV 13^ ; pat. + tib. IV 4J millim. 



A single female of this large and beautiful species, which appears 

 to be closely allied to Fh. auctus C. L. Koch* from Pennsylvania, was 

 captured at Denver, Colo., July 10. I have kept for it the generic name 

 Phidqjpus (of which I consider it as the type), -as it appears to differ 

 from Phikcus Thor.f {Philia 0. L. Koch) at least by having the interval 

 between the eyes of the second and third rows comparatively much 

 greater than in Philcms, about double as great as the interval between 

 them and the fore lateral eyes. The mandibles are not geniculated at 

 the base in this spider, as they are in the females of the genus Philceus 

 known to me. 



Order OPILIONES. 



Section PALPATORES. 



Fam. PHALAXGIOID^. 



Gen. MiTOPUS Thor., 1876. 

 3L 21. biceps n. 



Body blackish or brownish above, densely mottled with small yellow- 

 ish or grayish spots ; first cephalothoracic segment with a longitudinal 

 yellowish middle line forked in front, the following part of the back 

 with two parallel rows of black spots, continued posteriorly by a few 

 pale spots ; frontal margin of cephalothorax elevated into two denticu- 

 lated tubercles ; two supramandibular teeth ; eye-eminence with two 



*Die Arachn., xiii, p. 14??, tab. cccclvi, fijj. 1204. 

 t Conf. Simon, Arachn. de France, iii, p. 40. 



