A2 NEW YORK STATE MUSEUM 
Dolomedes tenebrosus, Banks, U. S. Nat. Mus. Bul. 72, toto, 
s Delo Atlee Wen aluiish Bankcue lar OCs e NCA aiING tn SGiemmEnall aen mn Omerey 
Ne tenebrosus), Petrunkeyiteh) |) Bul) Amer) Mus) Nat: 
Stem Onn ZO S42 
Dolomedes vernalis, Petrunkevitch, ibid. p. 543 
Dolomedes vernalis, Comstock, The Spider saat INEUYAS LOLA saps 
613-614, figs. 702-703 
Dolomedes tenebrosus, Comstock, ibid., pp. 608-609, figs. 694-605 
Dolomedes idoneus, Barrows, Ohio, Jour. Sci. 19018, 18:313 
Dolomedes idoneus, Gibson, Ent. Soc. Ont., 47th Ann. Rep’t 1917, 
" By ae sletla does) mertom rans oye) Can inst. loon m2:e27, 
Remarks. Hentz’s description of the species is brief but the 
figures are recognizable and I see no reason why his name should 
be discarded. Montgomery (1902) applied the name D. idoneus 
and has been followed by other writers in several instances. Emer- 
ton (1909) has pointed out, that the female described by him in 1885 
under the name D. tenebrosus was a specimen of D. 
scriptus (fontanus Em.) and that the male of another 
species Di Mivailittant Us ccalledy D) iubmitmiant onan byaiNe mentary 
wal) \Gesemlayscl Bis ID) Gc eimel ira gues 9 Wks Able male @r ID). 
tenebrosus _ was described by Emerton under the name D. 
Werle >. 
The difference in size of the sexes in the north is striking, the 
females averaging over 20mm in length, the males about 7.5-8mm. 
Males from the south are larger. A specimen from Baton Rouge, 
La., 12.5mm long, has the first legs 34mm and the third legs (the 
shortest) 29mm iong. ‘Two specimens from Virginia measure 
respectively 11 and 8mm; one from Washington, D. C., 9mm. New 
York and Ohio specimens are about 7.5mm long with the longest 
legs, first and second, about 21mm. 
Habits. In the north adults of both sexes have been found in 
May, indicating earlier maturity than in the case of D. scriptus; 
it is in June, however, that mature specimens are commonly found. 
In the south the males may be fully grown early in the spring and 
at Baton Rouge, La., Comstock collected one in March. 
It is probable that during the mating season this species may be 
found in the vicinity of water; later in the season, however, I have 
found many immature specimens a considerable distance from water 
in dry woods. In August on Valcour island, Lake Champlain, where 
females of D. scriptus _ had their nurseries in almost every 
rock crevice near water, many immature individuals of D. tene- 
brosus_ inhabited an old tent several hundred yards from the 
lake. A single mature female was found under a short board on the 
