Genera of the Family Attidce. 279 



Falces short in the females. 



Maxillae slightly inclined towai'd the lip, truncated at the tip. 



Lip short, rounded, 



Legs slender, fourth pair longest, the other three variable. 



Abdomen conti'acted near the middle: body nodose, elongated. 



Type, S. formica Hentz. 



S. formica, upon which species Hentz founded this genus, is undoubtedly 

 identical with Janus gibberosus Koch, which was used to form the genus 

 Janus. Both Hentz and Koch had the spider from Pennsylvania. The 

 other species of Janus described by Koch, J. melanocephalus, has been 

 made the type of the genus Janigena by Karsch. 



Hentz, when defining hi:5 genus Synemosyna, wrote " cheliceres short in 

 emale," and in contrasting it with IMyrmecia notes that in the genus (Myr- 

 mecia) " the cheliceres are large in this, (Synemosyna) they are small at 

 least in the female." When describing his typicil species — S. formica — 

 he states that " the cheliceres are large on.?^ in the male.''' AH the other 

 species placed by him in this genus, both in the male and fema'e have 

 the cheliceres short. Now as a matter of fact both sexes in S. formica 

 have short cheliceres. Mr. Emerton first called attention to the error in his 

 notes to Burgess' edition of Hentz's arachnological writings. We have 

 seen a good many males of this spider and all had the short falces. If 

 S. formica represents Hentz's genus, then nearly, if not all, the species 

 placed here by Messrs. L. Koch, Thorell and Karsch, belong in another 

 genus. 



RHOMBONOTUS L. Koch. 1879. 



Rliombonotus L. Koch. Arachniden Australiens, p. 1067. 



Cephalothorax almost twice as long as wide, coatracted equally in front 

 as behind, slightly convex. 



Clypeus about the radius of the middle eyes of the first row. 



Quadrangle of eyes longer than wide, narrower in front than behind; the 

 third row of eyes placed behind the mi Idle of the cephalothorax 

 and above the lateral declivity of the sams, more widely sepirated 

 from one another than from the margin of the cephalothorax. The 

 first row of eyes slightly recurved and close together. The middle 

 eyes are nearer the lateral eyes of the first ro v than the eyes of the 

 third row. 



Maxillae moderately convex, anterior m irgin round. 



Labium half as long as the maxilla, a little contracted toward tlie anter- 

 ior, the tip rounded. 



Sternum convex, long, contracted, projecting between the anterior thighs 



Legs 4, 1, 2, 3.: the second and third pairs of equal length, the first pair 

 more robust than the others. Patella with the tibia of the third 

 shorter than the patella with the tibia of the fourth. The fourth leg 

 has the metatarsus with the tarsus longer than the patella with the 

 tibia. 



