42 



the back. The six spots under the thorax are indistinct, and in some 

 specimens united into two brown bands. 



Dorchester, Mass. April 27, on water. 



'Swampscott, " May 8, " 



Dedham, " November 9, large number of young on a fence 



across a meadow. 



Albany, N. Y. J. H. e.] 



Genus Micrommata. Latr. (Spa?'assus, Walck.) 



Characters. Cheliceres moderately strong ; maxillce parallel, 

 rounded at the extremity ; lip short, rounded, wider near the 

 base ; eyes eight, subequal, in two rows, the upper one longest, 

 curved from the base towards the lower row ; feet long, slender, 

 second pair longest, then the first and fourth, the third being the 

 shortest. 



Habits. Araneides making no web for dwelling, but wan- 

 dering and casting some irregular threads to arrest their prey ; 

 making a tent among leaves for the protection of the cocoon 

 and the rearing of the young. 



Remarks. I could not adopt the two families of Walckenaer, 

 because the eyes, when large, are unequal; this shows the 

 great affinity between Micrommata and Dolomedes. My first 

 tribe, the Arcuatse, approaches very closely to that subgenus, 

 particularly Micrommata undata. 



Tribe I. Arcuatje. Lower row of eyes straight, middle 

 eyes of the upper row larger, or borne on tubercles. 



Tribe II. BiARCUATiE. Upper and lower roivs of eyes bent 

 and opposed, the loiver being bent toivards the base, eyes equal or 

 subequal. 



(Arcuatce.) 

 1. Micrommata undata. 

 PI. 6, fig. 7. 



Description. Testaceous or yellowish ; cephalothorax with 

 [193] a broad, brownish band; abdomen with a scalloped, 

 dusky band ; feet slightly marked with dusky. 



