Supplement to the Nciv England Spiders. 233 



Peckhamia scorpionia. 



Synemosyna scorpionia, Hentz. Boston Journal Nat Hist. 1840. 

 (Plate XII, figures 6, 6 a.) 



This little spider was found at New Haven, Conn., in 1883 but 

 was overlooked at the time of publication of the N. E. Attidae. 

 Since then it has been found in considerable numbers at Cold 

 Spring Harbor, Long- Island, N. Y., and at Cambridge and Ipswich, 

 Mass., always on fences on which it runs about slowly and irreg- 

 ularly like an ant. When threatened it flattens itself against the 

 wood, holding on so tightly that it is hard to pick it up without 

 injur}'. The males mature about June 1 and when confined with 

 females dance before them much like picata, holding the abdomen 

 up vertically and swinging it toward the advancing side and some- 

 times turning the feet of that side under the body. The front legs 

 are not turned forward as much as in picata. 



The females are about 3 mm. long, the males 2 to 2.5 mm. The 

 cephalothorax is twice as long as wide, and widest across the hin- 

 der third. The posterior eyes are farther back than the middle 

 of the cephalothorax. The abdomen is oval, slightly widest behind, 

 and both it and the cephalothorax are flattened on the upper side 

 and without any constrictions or indentation. 



The legs are short and slender and the first pair thickened in 

 both sexes. The color is dull brown and gray with pale markings. 

 On the cephalothorax there is a transverse light spot just behind 

 the eyes. On the abdomen there are two white stripes across the 

 middle and between them two light spots connected with the an- 

 terior band. The space between the light bands is slightly paler 

 than the rest of the abdomen. The legs are pale with a dark 

 longitudinal stripe on the front side. The femora are darkened a 

 little in the first, and less in the second and fourth pairs. In the 

 male the first legs have the tibia and patella thickened as well as 

 the femur, but not flattened on the upper side as they are in picata. 



Myrmarachne albocinctus, Koch. 



Salticus albocinctus, Koch. 1846. Vol. XIII p. 36. 



Salticus ephippiatus, Em. Trans. Conn. Acad. 1891, 



It is doubtful if this is the Synemosyna ephippiata of Hentz 

 neither his description nor figure show the thickened palpi. 



