198 THOMAS DAY 
Key to families and genera .... 22 
Sua bivrnn Soest) eretane teeters 21 
Ha bru Se ote ats oe eer eer eeeacre 17 
Jamba, A lloperlagys. 6 0 es 61 
Ioateral anger. che eens 18 
Mercy Mucwaicioe Mies toch 7p Mea 19st 
Length of :pody wae tear 16 
Lleuctra. tae oo tee. o teat ote 96 
Ts Claasseni®, neritic 100 
Ty, Tdeceptary fee ce is oe oes 99 
Tie Sibley i sey. puietene aes teers 98 
Life cycler... ce tpyee ne ee 7 
Linesmedian Gierastt. se en BLO 
lyeorias, Acroneuria ......5,.-6. 87 
Marginal/ fringe: 24-2... 44. 19 
Marginal @roove eo. -enrin ea cen 18 
maura, Taeniopteryx ¢..%..-« «1. 104 
Medis,. erate Bes tener eee 48 
Median line 7... setes Scr es 18 
mediana.<A lloperla vaen oece 2 aie 61 
Meésothorax® #2.) a eee 18 
Metamorphosism™ 2.02 tae in tet re 
Metathoraxiee.-3.0 ys so eee a 18 
Mouthparts) soe «eee 18, 20, 21 
mystica, A loca pnigg cs meme ao 116 
NG@MmOUTS 4.8.cer tetera a eee 92 
Nemoura, key to species ........ 94 
Ne coloradensisa. cote oe 96 
Noevallienlariag. «2. ee kee 95 
INS VGUOSA Batic e.s een or re eee eee 95 
Nemouridae as: p79 piace eee 92 
Neaperlan anc einen Sees 66 
Ne clymene Saye ee 67 
nivalis, Taenioptenyx. a 2a 103 
Oceipitaliridgela. ca. ee een 17 
Ql put ena. oop uae ee eee ee Vi 
Ovcel Hi aiscctee che: eces eg anek eeee e lwp 
pacilica; Acronentiaua as. oe. 88 
pallidula,cAloperlas: oe ae. 62 
Paraperlancsce cnc ae eee eee 64 
BP... trontalis es ee tee eee 65 
parvula, “laeniopteryx.. = ee 105 
Peltoperlag: at, ti eee ee 38 
Pf arcuate 7h t...iecat eae ee 39 
Peltoperdidde. 2... chee ere 38 
Perlad: Satara eee Tee 46 
Perla, key to species) ase... <.6 47 
Py BeStivalis’: ace ware eee 53 
Pabiobe tae psa oe 54 
Pia Ga pita. taste ee eae ee 47 
PS expanse ree a ce te cele ee tte 55 
Pelastata sa. ccc os eee ee 55 
ESI Mar ois ba ae ee ere ene 50 
PA TIMCCI Ar Aire ven, one eet at eee eee 48 
Ra Verticalis sa he.cra ae nee 57 
Perlestasiotat on ari tree eae 76 
DAplicilacsa . cna eae 77 
PerlineliateJ) 0.) tt nee ie 9 
AGMA E Edges Gor sities Sete intees re pt) 
FOUNDATION 
Perlidae’ ...4.: 00+ ses eer 41 
Perlodes:......- 22. sven eee 41 
Perlodes, Key to species ....... 43 
P. americana... .«< +0. see 4t 
P.stibialis . 3... s <5 a4 
P. signata. ...... «can spe 43 
petersoni, Isoperla 77723 74 
placida, Perlesta, .< 1. @..0anane fly 
Plecoptera, key to families and 
PONELA 2... sss che 22 
Preservation of nymphs........ 14 
princeps, Pteronarcys .... 3... 33 
Pronotum”™).... 0.2). =a 18,2) 
proteus, Pteronarcys >...) .50 30 
Pteronarcella .-...0. 3.9 ee 34 
Pteronarcella, key to species . 30 
Py, badia. oi... 2). 302 30 
P. reguiaris ..2.... «rer 36 
Pteronareidaé ...... 2. see 26 
Pteronareys. .. 2. Js. 27 
Pteronarcys, key to species ..... 29 
P...biloba:... «+ .\«. s -22sn ee 30 
P. californica, ..... 4262. 32 
P, dorsata “ss is °+ays see ee ol 
P. princeps <....../5. seen 30 
P. proteus. , «../: .’. «s/c 1h) See 30 
pygmaea, Allocapnia . 1.2mm 112 
Rearing nymphs°....2 5 eee 13 
recta, Allocapnia’ |. - 2. seem 113 
regularis, Pteronarcella ....3n 36 
Respiration ..........sai¢es==aaae 4) 
Rugosities .....2.. 3: 18 
ruralis, Acroneuria . j.)0¢reeee 89 
Sereen cages ........ + seen 13 
Sexes, determination of ........ 22 
sibleyi, Leuctra ......) seen 98 
Sieve net for collecting, ..... 11,412 
signata, Isoperla ..<. 3 eee 75 
signata, Perlodes ... 2 ..esuem 43 
similis, Clioperla. .. . 46). eee ra 
spatulata, Alloperla (322 ema 62 
Staining preparations ......... 15 
Study, preservation for .... ..0. 14 
Summary of characters ........ 20 
Suture, clypeal-labral .. 5 ve. ake 
Suture, epicranial .. *... 2. eee a lieg 
Table, distribution and emer- 
PENCE. 05 Jes. ss ee 121 
Taeniopteryx: 9. 1...) 101 
Taeniopteryx, key to species ....103 
T. californica... .... 32.2. 107 
T, fasciata ..... 2... 2.5) oe 106 
T..MAUTA . yess es ss «oe oe 104 
TT’. nivalis”. 2.0. 4) ae 103 
T..parvula . 2. .'.0s'. sae 105 
Technique .....,. «+050 eee 14 
Terminology used ..2, 3. .saneem 16 
theodora, Acroneuria .......... 90 
tibialis, Perlodes ....3 -\a aaa 44 
