ARANEAE 



417 



Key to the families of Dipneumones here described : 

 f.'i With cribcUiim and calamistrum (Fig. G55). 



hi Eyes all dark-colored (diurnal) ; web usually regular 1. Uloboridae 



&2 Anterior median eyes dark, the other light-colored (nocturnal) ; web 

 irregular. 



Cj Lateral eyes near together 2. Dictynidae 



Ca All the eyes close together on an eminence 3, Filistatidae 



Uo Without cribellum and calamistrum. 

 6i Two terminal claws on the feet. 



Ci Six eyes ; 4 spiracles ; ground spiders 4. Dysdekidae 



C2 Eight eyes present. 

 di Eyes usually in 2 rows. 



61 First 2 pairs of legs not noticeably longer than the others. 



fi Fore spinnerets widely separated ; ground spiders 5, Drassidae 



fz Fore spinnerets contiguous; ground spiders 11. Clubionidae 



63 First 2 pairs of legs much longer than the others ; crab spiders. 



10. Thomisidae 

 dz Eyes in 3 rows, the middle row being much smaller than the others. 

 &2 Three terminal claws on the last 3 pairs of feet. ^'^- -^ttidae 



c\ Legs very long, being over 4 times the length of the body 6. Pholcidae 



C2 Legs not so long. 

 di Eyes in 2 rows. 

 Ci Hinder part of spinnerets not very long. 



/i A comb of serrate bristles on the hind foot ; abdomen often globose. 

 f. No such comb. ^' Theridiidae 



g^ Basal segment of mandible with row of teeth on its outer surface ; 



small spiders with irregular webs 8. Linyphiidae 



<72 No such mandibular teeth ; usually large spiders with regular 



radial webs 9. Epeiridae 



Qs A semicircular notch at base of leg on penultimate segment. 



13. PiSAURIDAE A I 



62 Hinder pair of spinnerets / 



very long and 2 jointed. ,,^-^^8^=—^^^ ^^r=:^^^^-^^=r '^7}A 



12. Agelenidae .i-r^;^^?^^^^-^ "^ """^^l^ 



d^ Eyes in 3 rows . . . 14. Lycosidae • ■^»^'^^^ V^\ \\ 



Family 1. ULOBORIDAE. o- n.- v . ^- ^^.■^- 



A cribellum and visually a cala- M't^ifrrkC/D^iJ 



mistrum (Fig. 655) present; lateral -3' -^ ■ 



eyes farther apart, than the 2 pairs ij"' '"S^^'^ftD^ 



of median eyes; web usually round / A B 



and regular, with radiating spokes Fig. 655— A, part of fourth leg of 



. • , , .11 1 Amavrohius ; B, ventral view of hinder 



jomed by cross threads and com- end of same. 1, calamistrum ; 2, cribel- 



-, . J. i? 1 u J £ •^^ lum ; 3, anterior spinnerets ; 4, middle 



posed m part or loose bands ot silk : spinnerets ; 5, posterior spinnerets : 6, 



3 genera, and 6 American species. "^"^- (Cambridge Natural History.) 



1. Uloborxts Latreille. Ceplialothorax ovate, rounded behind; eyes 

 all of about the same size: 4 American species. 



U. plumipes Lucas. Length of female 7 mm. ; cephalothorax low ; first 

 pair of legs in the female twice as long as the second, with a bunch of long 

 hairs at the end of the middle segment ; color brown, with a median stripe 



