THE SENSES AND THEIR ORGANS. ' 289 



light. I liave always found it hanging on tlie central sliicld nl' its wcli in 

 hroail (iMviight ami at all hours of the day. Its eyes are a liglit yellow 

 color. Tile ^anie is (rue of Argiojie argyi'aspis. Acrosoma rugo.sa I have 

 always found upon its web in daytime. Tliis is a wood loving species, but 

 coniinonly spins its web in open places. Its eyes are light gray, the mid- 

 dle front pair having a little darker shade. ' Epeira labyrintliea is also a 

 diurnal spider, selecting, as a rule, a position upon branches strijtped of 

 foliage or dead limbs. Its rear eyes are light colored, pearl gray or a del- 

 icate amber, but those of the front row are black. Epeira insularis habit- 

 ually occupies its nest of sewed leaves during the daytime and often at 

 night also, but it takes prey quite freely during all hours of the day. Its 

 ej^^s are all light colored. Two gravi<l specimens of this species which I 

 examined had eyes decidedly lighter than other specimens, and the rjues- 

 tion occurred to me whether it might not be that the color of the eyes is 

 affected dui'ing the period of gestation. I had not sufficient specimens, 

 however, to follow this inquiry, which, perhaps, is not worthy of further 

 attention. 



The eyes of Linyi)hia weyerii, which I have examined from several 

 s})ecimens received fi'om Liiray Cave, are of light color, the two central 

 eyes being white. The latter is a marked variation from the general con- 

 dition of this jiair of eyes, which appear to be darker, as a rule, in all 

 terrestial sj)ecies, and to be obliterated in some cavern fauna. 



I submitted a few Euro])ean species to a similar examination.' Tetrag- 



natha extensa (Russia) has tlie side eyes a yellowish brown, the side rear 



ej^es of lighter hue than the side front. The midrear eyes are 



uropean ^^^^.^ j^ellow, and the midfront eyes are darkest of all. Epeii-a 



sclopetaria (Ireland) has the side eyes light colored, the rear eyes 



being lightest. The midrear eyes are a dark yellow, and the midfront 



darkest of all. Epeira sclopetaria of Russia is colored in the same way. 



Epeira quadrata (Russia) has the side rear eyes light colored, the side front 



eyes a little darker hue, and the front eyes tolerably dark. Epeira dia- 



demata (Russia) has the rear eyes brownish yellow, the front eyes a darker 



hue of yellow, and the front side eyes a darker yellow, and the midfront 



eyes darkest of all, almost black. 



None of the above sj)ccics can be classified as nocturnal in their lial)its, 

 although all of them, of course, are able to capture prey at night. Tet- 

 ragnatha extensa and E])eira sclopetaria ai-e continually .seen ujron tiicir 

 webs in broad dajdight. Epeira quadrata and Epeira diademata belong to 

 nesting species, having habits similar to our Epeira insularis and trifoiium. 

 They live in dome shaped tents, roofed and walled by clustered leaves or 

 by a single rolled leaf. Their faces are towards the opening, looking upon 



' The Russian specie.s were received from Mr. Waldemar WauiuT, of Moscow, and the 

 British species were collected partly by myself and jiavtly by Mr. Thomas Workman, of 

 Belfast. 



