Attidce of North America, 7 



27. ' Cephatolthorax high, massive; quadrangle of eyes i^lainly wider 



(often much wider) behind; first row of eyes usually curved; 

 legsl,4, 3, 3, 1,4,2,3, 4, 1, 3, 2, or 4, 3, 1, 2 29 



28. Unlike the above 33 



29. Legs 1, 4, 3, 2, 1, 4, 2, 3 or 4, 1, 3, 2 31 



30. Legs 4, 3, 1, 2 Plexippus. 



31. Eyes of second row twice as far from dorsal as from lateral eyes. 



Phldippus. 



32. Eyes of second row halfway or about halfway between lateral and 



dorsal eyes Phil^us, 



33. Third leg longest, fourth next Habrocestum. 



34. UnUke above 35 



35. Cephalothorax convex, and high, or moderately high 51 



36. Cephalothorax low and flat 37. 



37. Abdomen at least four times as long as wide; cephalothorax low 



and flat, not wider than third row of eyes; legs of first pau- verx 

 long Hyctia-.. 



38. Unhke the above 39 



38. Spines only on metatarsi of first pair - Admestina. 



40. Legs all spined 41 



41. Cephalothorax plainly wider than third row of eyes, quadrangle 



equally wide in front and beliind 43 



42. Unlike the above 45 



43. Quadrangle of eyes i wider than long, occupying f of ceplialo- 



thorax; lateral eyes of first row separated by not more tlian ^ 

 their own diameter from middle eyes Menf.mertjs. 



44. Quadrangle of eyes i wider than long, occupying ^ of cephalo- 



thorax; lateral eyes of first row separated by at least ^ theu- own 

 diameter from middle eyes Marptusa. 



45. Middle eyes of first row three times as large as lateral eyes; quad- 



rangle of eyes nearly twice as wide as long " Sadat. A. 



46. ]\Iiddle eyes of first row about twice as large as lateral eyes; quad- 



rangle of eyes not more than ^ wider than long 47 



47. ^letatarsi III and IV with spines only in terminal circles; legs never 



( t)4, 1,2, 3, nor 1,3, 2, 4;(?)4, 1, 3, 2, nor 4, 3, 1, 2 Icros. 



48. Metatarsi III and IV \%'ith sj^ines tlu-oughout their length; legs {S) 



4, l,273"orl, 3, 2, 4; ( 9 ) 4, 1, 3, 2or 4, 3, 1, 2 4^ 



49. Coxae I nearly touching; legs ( 4 ) 4, 1, 2, 3; ( 5 ) 4, 1, 3. 2; quadran- 



' Spidere in this group except Phidi})i)us rufus, Philccus inilitaria, and Plexijiiius puer- 

 perus are large, from 8 to 16 ram (commonly about 10 mm) in length. The sides of the 

 cephalic part are usually much swollen. 



2 Our only species of Admestina is small, not more than 4 m m long. 



' Sadala is distingul.shed from Ictus by having spines throughout the length of the meta- 

 tarsi of the third and fourth legs, and by having the leg formula 1, 4, 2, 3. Our only species 

 of Sadala is from Mexico. 



