544 HARVEST-SPIDERS OF OHIO WEED 



Tlic tlircc <ieiieni Ibniid in Ohio may be (listiiifiiiishcd as ibllows: 

 I. — First joint of luaiidiblcs with a tooth on vential surface iioar hase, 

 A. — Maxillary lobes of second pair of legs with a large base, impressed, straight 

 and elongated, not attenuate, but rather a little enlarged from the base to 



the apex and very obtuse; claAV of palpus denticulate IJohunum. 



B. — Maxillary lobes of second pair of legs forming elongated triangles, i|uito large 

 at the base, then gradually retracted, not impressed, with anterior border 



straight ; claw of i)ali)us not denticulate M'itojtuH. 



II. — First joint of mandibles without tooth J'halaiif/ium. 



Liobunum V. Koch, 1839. 



Aiiterior and lateral bordcis of the cephalotliorax sniootli. T^ye emi- 

 nence ratlier small ; smootli, or provided with small, slightly distinct 

 tubercles; widely separated from the cephalic border. Lateral pores 

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

 circular, 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 without any process and without 

 l)rojecting angles; maxillary lobe provided at the base with two strong- 

 conical teeth. Maxillary lobe of the second pair of legs very long, 

 ncaily straight from the base, not attenuated, directed mesad nearly 

 horizontally, and united on the ventro-meson to the lobe from the oi)po- 

 site side without forming a sensible angle; the two together lightli^ 

 aiched on the cei)halic border, and forming an even curve. Sternal 

 l)iece large, slightly contracted between the fourth pair of coxa*, gradu- 

 ally enlarging and obtusely truncate cei)halad. Legs very long and 

 slender; tibia of the second pair with a few false articulations. Pali)al 

 claw denticulate. 



The species of Liobunum found in Ohio, with the exception of />. 

 hicolor, may be distinguished by the following artificial key, which 

 applies esi)ecially to the males. 1 have not seen mature specimens of 

 this sex of L. hicolor, and so have not included it: 



1 . Femur of front leg shorter than body 3 



2. Fe.mur of iron t leg longer than body 5 



3. Dorsum grayish-brown, spotted mdculnstnn 



4. Dorsum reddish-broAvn, not spotted qrande 



5. Femur of palpus with a distinct spur on its outer veutro-lali lal angle ralmr 



6. Femur of pali)us without a S])ur 7 



7. A distinct black longitudinal central marking on dorsiiin 9 



8. No distinct black central marking 11 



9. Second legs 70-100""" in length ; southcn-n viHatinn 



10. Second legs 45-70""" in length ; northern vitlatuni dorKalnm 



11. liody and legs cinnamon or yellowisli-brown voitricosiim 



12. Hody brown, legs black 13 



13. Palpi black iiidropalpi 



14. Palpi brown 15 



15. Second legs with a white ring at distal end of tibia longipes 



16. Second legs black throughout 17 



17. Eye-eminence with two rows of many tubercles; body small )><)lHiim 



18 Eye-eminence with few tubercles ; body of medium size uh/ripes 



