No. 2.] SPIDERS OF THE MARPTUSA GROUP. 87 



It is also near Menemerus, but in this latter genus the 

 species are somewhat smaller, while the cephalothorax is higher, 

 and not so flat, and is dilated on the sides. The cephalic part 

 is relativelj^ a little longer in Menemerus, occupying nearer two- 

 fifths than one-third, and the third row of eyes is nearly as wide 

 as the cephalothorax at that place, the eyes being about equally 

 distant from each other and from the lateral borders, instead of 

 much further from each other, as in Marptusa. 



It differs from Bavia in being flat and in being longer in 

 proportion to its width. Bavia has the sides and back of the 

 thoracic part rounded and the abdomen is narrow, rounded, and 

 tapering behind. 



Marptusa is easily distinguislied from Icius, as in the latter 

 genus the species are much smaller and the cephalothorax is not 

 so much flattened above, both cephalic and thoracic parts being 

 somewhat inclined from the dorsal e3'es. 



We have, in our collection, eight species belonging to the 

 genus Marptusa. These are mucosa Gl., the type (Marpissa 

 mucosa Simon, Arachnides de France, A'ol. III., p. 25), from 

 France and Holland ; melanognathus Luc. (Menemerus me- 

 lanognathus Peckham, N. A. Spiders of the Family Attidse, p. 

 82), from .Japan, Madagascar, Mauritius (Attus muscivorus Vin- 

 son, and Attus nigro-fuscus Vinson), Canary Islands, Santarem, 

 Brazil, French Guiana (Attus planus Taez.), Guatemala and 

 Florida; also familiaris Hentz (Marptusa familiaris Peckham, 

 N. A. Attidce, p. 80) ; californica P. (N. A. Attidas, p. 81) ; poma- 

 tia (Marpissa pomatia Wlk., Simon's Arachnides de France, 

 Vol. III., p. 26), from Southern Europe ; and the four new spe- 

 cies described in this paper, magna, agricola, broadwayi and 

 millerii. 



MARPTUSA MAGNA SP. KOV. 



Plate VIII., Figs. 3— 3a. 



S . Length, 10. Length of cephalothorax, 4.3 ; width of 



cephalothorax, 3.2. 

 ? . Length, 12. Length of cephalothorax, 4.8 ; width of 



cephalothorax, 3.5. 



