4 



— 13' — 



( Spinnerets at the etui of abdomen ...... Eugnatha 



( Abdomen projecting beyond spinnerets in a tail .... Eucta 



Our species of the last three genera may be separated as in 

 the foIh)\viiij>: keys. Some sjieiies are very common and often 

 noticed by ail observers of nature. The webs are usually nearly 

 horizontal, but sometimes (piite oblicpie. The .ijenital characters 

 are nearly the same throuiihout, so that youns^' forms are often as 

 easil)- determinable as adult ones. 



Tetragnatha ^. 



I ibia of palpus barely longer than patella ..... laborio5a 



Tibia of palpus twice as long as patella 



l-"ang of mandibles undulate ....... grallator 



Fang of mandibles an even curve ....... extensa 



Tetragnatha 



Abdomen silvery, S. K. separated, I.. .S. E. smaller than the others, small species 



laboriosa 



.\bdomen darker, S. E. closer together, equal 



Mandibles as long as cephalothora.x . . . . . grallator 



Mandibles two-thirds as long as cephalothora.K .... extensa 



Tetragnatha grallator Hentz. 



The female has the abdomen enlarged near the base; the 

 color darker than is tisiial in the ^ronp. The male varies much in 

 size. Leni^th of female lo — \i mm. Common in the l'>aslern 

 States and Te.xas. 



Tetragnatha extensa fjini. 



Smaller than ^^^nxllator and the abdomen shorter. The colors 

 are often tiuite dark, the cephalothora.x with dark stripes. Western 

 specimens have the tibial joint of the palpi shorter than the eastern 

 ones; antl are usually darker. l,ent>^th of female 8 — lo mm. 



This is a boreal species, crossing" our country from Maine to 

 \\'ashington State. In the north it is the most common species of 

 the group. 



Tetragnatha laboriosa Hentz. 



The female usually has a silvery abdomen, with adark obliciue 

 line each side, and two or three silvery stripes on the dark venter. 

 Sometimes there is a folium on the abdomen. The male is the 

 smallest of the subfamily. Western males have the abdomen a 

 little thicker than eastern ones. Length of female 6 — 8 mm. 



Probably the whole United States; 1 have it from X. Eng., 

 N. v., Mich., I). C, La., Fla., Te.x. and Wash. State. 



