Tlie PhalangiiiKi' of Illinois. SI 



SUBFAMILY PHALANGIIN.E. 



Arachnids having the body composed of a single piece' 

 with long slender legs. Teguments not coriaceous. Segments 

 only indicated by stria', which are often obsolete. Fi^e ventral 

 segments. A single anal piece. Two lateral pores easily seen. 

 Stigmata visible. Maxillary lobe of palpus with two tubercles. 

 Epistoma in the form of a triangular plate. 



The three genera that have been recognized in Illinois may 

 be distinguished as follows : 

 I. First joint of mandibles with a tooth on ventral surface 

 near base. 



A. Maxillary lobes of second pair of feet, with a large 



base, impressed, straight and elongated, not at- 

 tenuate, but rather a little enlarged from the base 

 to the apex and very obtuse ; claw of palpus den- 

 ticulate Liohimum. 



B. Maxillary lobes of second pair of feet forming elon- 



gated triangles, quite large at the base, then 

 gradually retracted, not impressed, with anterior 

 border straight ; claw of palpus not denticu- 

 late OligoJophus. 



II. First joint of mandibles without tooth Phalangiiiin. 



LiOBUNUM, C. Koch, 1839. 



Teguments soft or subcoriaceous. Strife of the cephalo- 

 thorax and of the three last abdominal segments very distinct ; 

 those of the anterior segments scarcely or not at all distinct 

 (especially in the <^). Anterior and lateral borders of the 

 cephalothorax smooth. Eye eminence relatively small; smooth 

 or, rarely, provided with small, slightly distinct, tubercles; 

 widely separated from the cephalic border. Lateral pores 

 small, oval, and marginal. Anal piece large, transverse-oval 

 or semicircular, much wider than long, and much wider than 

 the reflected borders of the eighth segment. Mandibles short, 

 similar in the two sexes ; first joint furnished at the base below 

 with an acute tooth. Palpi simple ; femur, patella, and tibia 



