Attidce of North America. 93 



SYNEMOSYNA (Hentz) 1833. 



Cephalothorax low, twice as long as wide, rounded and narrower behind; 

 thoracic and cephalic part not separated; thoracic part plainly divided 

 by two transverse constrictions and much longer than cephalic — 

 sometimes twice as long. Quadrangle of eyes but little wider than 

 long and a Uttle wider behind than in front. First row of eyes a lit- 

 tle curved; middle eyes touching, and three times as large as lateral 

 eyes, from which they are slightly separated. Eyes of second row 

 small and a little nearer lateral than dorsal eyes. Dorsal eyes larger 

 than lateral and further from each other, than from lateral borders, 

 forming a row as wide as cephalothorax at that place. Clypeus 

 about one-fourth as high as middle eyes. Falces short, rather weak, 

 vertical, parallel; fang weak. Maxillae slightly enlarged and trun- 

 cated at extremity, about twice as long as labium. Labium as wide 

 as long, rounded. Sternum long, rather narrow, truncated in front, 

 contracted behind, projecting between anterior coxas. Anterior 

 coxse separated by at least the width of the labium at its base. Legs 

 {$) 4, 1, 3, 2, (?) 4, 3, 1, 2, all slender; tibiee and metatarsi of the 

 first and the second, with two rows of inferior spines. Abdomen long, 

 rounded, slender, with a marked constriction; i^edicle of abdomen 

 visible from above. Synemosyna differs from the other genera of 

 ant-hke Attidge, in the following respects: Synageles Sim., Leptor- 

 chestes (Thorell) Sim., Damoetas Peckham, all have the quadrangle of 

 the eyes longer than wide, and the constriction of the cephaloth- 

 orax wanting, or, if j)resent, very slight, and separating the cephaHc 

 and thoracic parts. Agorius Thorell has the patella of the first leg 

 much elongated. Paradamoetas Peckham has no constriction of the 

 cephalothorax. The last two genera resemble Synemosyna in having 

 the quadrangle a little wider than long. It is nearest Salticus (Latr.) 

 Sim. ; Salticus, however, has the cephalic part on a higher plane than 

 the thoracic, and the greater length of the maxillas, and the labium 

 beiug much longer than wide also distinguish it from Synemosyna, 



SYNEMOSYNA FORMICA Hentz. 



Plate VI, figures 70, 70a. 



Syji.: 1845. Synemosyna /or7?iica H. , Journal Bost. Soc. Nat. Hist., Vol. V. 

 1846. Janus gibberosus C. K., Die Ai-achniden, XIII, p. 21. 

 1875. Synemosyna formica H., Coll. Arachn. Writ, by N. M. 



Hentz. ed. by Burgess, Boston, p. 73. 

 1888. Synemosyna formica Peckham, Descr. new or little known 



Attidce of U. S., p. 30. 



