47 
Venter black; second recurrent interstitial. 
11. harringtoni n. sp. 
Venter pale; second recurrent not interstitial. 
12. fylesi n. sp. 
Clypeus nearly truncate; procidentia long and projecting, keeled. 
20. dyarin. sp. 
heasepales py Orda pall eee serra ee lesan aioe eal = eel) 48. dubius n. sp. 
Body black, except venter of abdomen, femora, and sometimes terminal dorsal 
ares. 
Abdomen entirely black dorsally. 
Orbits pale; mesepimera black. ..........--.---- 13. kincaidi n. sp. 
Orbits black; upper halfof mesepimera pale.... 30. thoracicus Harr. 
Abdomen with more or less of dorsal segments laterally and apically pale. 
Procidentia minute, usually slightly emarginate at tip; abdomen 
usually nearly interrupted with yellow centrally. 7. ventralis Say. 
Procidentia medium, rounded at tip; abdomen not as above. 
10, coloradensis n. sp. 
Black above for most part; pectus and venter pale. 
Stigma and costa brown. 
Dorsum, including scutellum, black. 
Head nearly spherical, viewed laterally ; clypeus narrowly and deeply 
excavated; short, robust 2225. 2222 .2-s22: 224 '. 31. odoratus Dyar. 
Mead normal, triangular; clypeus rather broadly excavated ; 
Clongatewer eases sissies see Sa Saat yso Soe ce eee 02. cornelli n. sp. 
Dorsum black, scutellum pale-..... sowie eae 2 41. vancowverensis 1. sp. 
Stigma and costa pale. 
ProcidentiaasMongvas; widen. ++ ciseee eee oe eee 39. mendicus Walsh. 
Procidentia twice as long as wide.......-..-.-...- &. 37. vertebratus Say. 
INDEX TO SPECIES OF PTERONUS. 
antennabus N..SpsP 2==--2=--- =o 26) | longicornisim. sp: di----6 soe oeee 44 
HINES) vis gts Ne Ol saaeeeeceee pigaooae pHs TA Gee ote 34 
SME AOUS Ms Sn. aes xc Sno sale ee eee 24s) marlattite DyarO 2. --2s-ce---eeese 8 
Inve olor mSphO 222 snes se. ice, foe) mendicusaVWvalshg<O s2- se ses see 39 
Calitornicusm. sp; Ols= 2) -\s2\5 32 5'-2.2 20a MUlitAris)} OLESSOMO! s26" 9s oe eee 29 
Coloradensis: N. Sp..6 Q.----- ---os< 10 | monochroma Norton Ort a2 ks essa 50 
CommellieMasp ae S so a-255 oneness 32) | occidentalis naspr 9) ---------5--s— 2 
conylms\CressOn.®) 22 5 cestevs occas 19s |-odoratus Dyan1o sake a. see eee é 31 
decoratus Provancherg .......--- 46) || pacificus nm. spsO ses. 22-25 s2s8- 4-8 4 
—— dorsivittatus Cr. =vertebratus. pinguidorsum PDyar ? .---:-:----::- 42 
MMEOHUS MSP. ih sae acces <2 as-45e ASA POPULUM Spe, Cake oe SS i= ee 22 
Ghent Ils (Og) GY St osee bh eoeee ceaeee ZORRO CECUSH. Se On see eee ee se ae 35 
edwardsii Cresson 9 ......-------- ZS TIDES COP Ol eae see sne ease eee 27—~ 
erythrogaster Norton? ..-...----. 18 | robiniwe Forbes = trilineatus. 
foVentus nsap. 9 942220222265) 2222 14 | rufocinctus Harrington 9 ..-..--.- Ly 
fulvierus Provancher 9. :-.-....-- 20 | salicis Ashm. — fulvicrus. 
VlOSIRMNS Deh O sata os ccs e Se 12! similaris Norton — trilineatus. 
harringtoni n.sp. f 9 .--------:--- is Psoromatus NOGiOM Ol sss = ase 49 
intr SominyD vert Oe errors Js oars os oe 23 | thoracicus Harrington gf 9 ------.-- 30 
Hiya ASPs! - Sela 5 fo. 2. ss ose SOs MELICOLOR Naspae see 2S set > Bee - 16 
WHER ECLA Oo-(< eae kck owe ose oss 38 |.trilineatus Norton 9 --...-....---- 33 
Ini@escens, Cresson g, s2-=s----- ---- 45 trivittatus Norton = mendicus, 
LSVaGEINGHT SEIS) Oy GOR e oe eeeS sereeee ils} || Wa OolOP Ine A) NO caonseesantcaes5ar 43 
koebelei n. Bae ese sate Slo as ino sc 41 | vancouverensis n. sp. 6 Q'-=--- -=-- 40 
latifasciatus Cresson 9 ....-....-.. 6 | ventralis Say ¢ ©... [2esce.------- ff 
VAbUSEMeES DE ieee eae ees aoe =< == 3 || yertebratus Say ¢ 9 .-2248.--.-.... 37 
lmbabust @ressonyO yess. 22 se koe 5 | vicinalis; Cresson 9 Agere ..5...---. 1 
lombarde n. sp, g ht oe oe 47 
