salicis — nodus (Euura) 
salicis odoratus = odoratus (Pteronus) 
Balicis-ovaim (EH WuUna) eee eee eee ace 
salicis pisum = pisum (Pontania) 
salicis-pomum — pomum (Pontania) 
satkatchewan (Pteronus?) 
semirufus = fulvipes (Amauronematus). --. 
similaris—trilineatus (Pteronus) 
simplicicornis (Priophorus) 
siskiyouensis (Pristiphora) 
solitaris (Priophorus) 
stigmatalis (Pontania) 
stigmatus (Pteronus) 
suadus (Pachynuematus) 
subalbatus (Pachynematus) 
sulphurea (Pontania) -...-...--...- ee eee ce 
sumptus (Pachynematus) 
SUnLUUSt ONCIN ALES 4) scree sen smisssneeeeee= see 
sycophanta (Pristiphora) 
thoracicus (Pachynematus) 
thoracicus (Pteronus) 
| tibialis—sycophanta (Pristiphora).......-. 115 
| Erichiocampus!-s-2-e<=<=-eeesesicaes | Sess 20 
imtricolor(eteronus) ceases seen eee cone 56 
imonibuncatus (ONematus'?)h se nomoss sec acces 132 
trilimea tus) (Ee teromus) 2 ssc] ose eee ere 66 
| trimaculatus —ribesii (Pteronus) -.......-- 61 
| tritici: (Rachynematus)--—--0s2.-0sees--- 2-1 106 
trivialis = sycophanta (Pristiphora)......-. 115 
| trivittatus —mendicus (Pteronus)...-...--- 69 
truncata (Ponbania)i..+occ-sees---5=s2sS~ - 38 
mnicolor((NeMatus)tsassescececce ose ceeesese 88 
nNLeolor (Pteronus) mcs seeeeee eee cer sae ee 72 
vVancouverensis) (eteronus)|--------.----5--- 70 
ventralis(Pteronus) ieee cece eee ease eee eee 50 
ventricosus —ribesii (Pteronus)......-..... 6L 
vertebratus: (EPteronus) ss-<2---2--5-5 -22o6- 68 
viminalis (Trichiocampus) .....---...-- Ree 20 
violaceipennis = concolor (Amauronematus) 77 
wacinalisy (2 terons)eeee aaa tacos soe eee 48 
winnipeg (Lygzeonematus)..-.....--.------ 111 
wrangeli (Pachynematus)..............---- 109 
° 
