278- Wisconsin Academy of Sciences, Arts and Letters. 



Abdomen twice as long as wide; anterior part limited by a transverse im- 

 pression, covered by a thin skin; posterior part convex, clothed with 

 a hard dorsal integument. 



Legs spined, 1, 4, 2, 3; 1 and 4 equal, and 3 and 4 differ slightly in length; 

 first pair stouter than the others. Patella with the tibia of the third 

 pair shorter than the same articulations of the fourth pair; the 

 metatarsus and the tarsus of the fourth pair are shorter than the 

 patella with the tibia. 



JANIGENA Karsch. 1880. 



Syn.: 1846. Janus C. Koch, Die Arachn., XIII, p. 21. (ad partem). 



1880. Jauig-eiia Karsch, Arachnol. Blatter VIII, ZurKenntnissder 

 Attiden, mZeitschr, f. d, gesammt. Naturwissensch., LIII p. 393. 



The cephalic part sharply marked off, but not higher than the thoracic 

 part, very flat and wide. The quadrangle of the eyes is wider behind than 

 in front, the palpus over-reaches the very short mandible, also in the male 

 in length in wide contrast to Toxeus and Synemosyna. The two single 

 baiTen typical specimens do not admit of a more exact definition. Type, 

 Janus melanoc phalus (K). As the generic name Janus was preoccupied, 

 (Verany, 1844, Gastropoda) Karsch proposed the name Janigena. 



Thorell, in his review of the genera of European spiders, p. 36, had 

 called attention to the fact that the name Janus was preoccupied, even 

 before Verany, 1844. (Janus Steph. [Hymenopt] 1835). See remarks on 

 the genus Synecr.osyua under that genus. 



SYNEMOSYNA Hentz. 1832. 



Syn.: 1832. Synemosyna Hentz, on North Amer. Spid., p. 108. 



1846. Janus KocH, Die Arachn., XII I, p. 21 (ad partem). 



1870. Leptorch'rStes Thorell, on Europ. Spid., I, p. 209 (ad partem). 



1876. " Sim., Arachn. de France, HI, p. 10 (ad partem.) 



1877. Synemosyna Thorell, Studi Ragni Malesi e Papuani, I, p. 



198. 



1878. Janus Tacz., Arane'des du Perou, Bull. Soc. Imp. des Nat. de 



Moscou. L. Ill, 4, p. 372. 



1879. Synemosyna L. Koch, Arachniden Australiens, p. 1052. 



1880. Synemosyna Karsch, Arachnol. Blatter VIII, Zur K<»nntniss 



der Attiden, in Zeitschr. f. d. gesammt. Naturwissensch., 

 L. Ill, p. 395. 



1881. " Thorell, Studi Ragni Malesi e Papuani, III, 

 p. 406. 



Eyes eight, unequal, in three rows, the first composed of four eyes, the 

 two middle ones largest, the second composed of two small ones 

 placed nearer the first than the third, which is composed of two 

 larger eyes. 



