1879.] ON A NEW GENUS AND SPECIES OF SPIDERS. 119 



3. On a new Genus and Species of Spiders of the Family 

 Salticides. By the Rev. O. P. Cambridge, M.A., 

 C.M.Z.S. 



[Received December 17, 1878.] 



Some few months ago, Mr. Charles Darwin very kindly forwarded 

 to me two pretty little silken nests of a Spider of the family Salticides, 

 formed on the upper surface of the leaves of, apparently, some shrub 

 or herbaceous plant, and received a short time previously from Herr 

 Fritz Miiller of Blumenau, Sta. Catherina, Brazil. More recently, 

 in answer to a letter written to him by myself, asking for information 

 about the maker of these little nests, Herr Miiller has most obligingly 

 and })romptly sent me two more, together with several of the Spiders 

 by which they are constructed. All the Spiders are females, and 

 all, excepting one, immature. The nests are remarkable from their 

 form, and from the exactly similar size and shape of all the four that 

 have come under my notice ; they also appear to be, as Herr Miiller 

 tells nie, invariably formed on the midrib of the upper side of the 

 leaf. The accompanying figure (p. 120) will give a good idea of this 

 curious little three-entranced domicile. 



There is nothing particularly remarkable in the appearance of the 

 Spider. It is, however, interesting in respect of the generic details of 

 its structure ; for although it bears a strong affinity to several Euro- 

 pean genera of Salticides {Menemerus, Sim., Marpessa, C. L. Koch, 

 Hyctia, Sim., and Icius ejusd.), I am unable to get it satisfactorily 

 into any of them ; I have therefore characterized a new genus for 

 its reception. 



Herr Miiller tells me that he finds the nests of this Spider on the 

 leaves of various plants. 



Fam, Salticides. 

 Fritzia, g. n. 



Cephalothorax longer than broad, the length being about half as 

 much again as the breadth ; upper surface perfectly flat ; depth mode- 

 rate ; hinder slope short and very abrupt. Ocular area rectangular, 

 considerably broader than long (the length being no more than half 

 the breadth), and scarcely more than one third the length of the 

 cephalothorax. 



Eyes of foremost row very unequal in size, separated by rather 

 considerable intervals, those of middle row nearer to the foremost 

 than to the hinder row. 



Legs short, moderate in strength, relative length apparently 

 1, 4, 2, 3, the actual difference between 1, 4 and 2, 3 respectively 

 being very small ; those of first pair much the strongest. Spines be- 

 neath metatarsi and tibiae of first and second pairs ; those of first 

 pair long and strong. 



Abdomen short oval, and of a somewhat flattened form. 



