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. dyari n. sp. 
Legs pale, pygidiuni pale 48. dubius n. sp. 
Body black, except venter of abdomen, femora, and sometimes terminal dorsal 
arcs. 
Abdomen entirely black dorsally. 
Orbits pale ; mesepimera black 13. kincaidi n. sp. 
Orbits black ; upper half of 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 31. odoratus Dyar. 
Head normal, triangular ; clypeus rather broadly excavated ; 
elongate 32. cornelli n. sp. 
Dorsum black, scutellum pale 41. vancouverensis n. sp. 
Stigma and costa pale. 
Procidentia as long as wide 39. mendicus Walsh. 
Procidentia twice as long as wide 37. vertebratus Say. 
INDEX TO SPECIES OF PTERONUS. 
antennatus n. sp. $ 
atriceps n. sp. 9 
auratus n. sp. 9 
bicolor n. sp. 9 
californicus n. sp. 9 
coloradensis n. sp. $ 9 
cornelli n. sp. $ 9 
corylus Cresson 9 
decoratus Provancher $ 
dorsivittatus Cr. = vertebratus. 
dubius n. sp. $ 
dyari n. sp. $ 9 
edwardsii Cresson 9 
ery throgaster Norton 9 
foveatus n. sp. 9 
fulvicrus Provaucber 9 
fylesi n. sp. $ 9 
barringtoni n. sp. $ 9 
hudsonii Dyar 9 
hyalinus n. sp. 9 
integer Say 9 
iridescens Cresson $ 
kincaidi n. sp. $ 9 
koebelei n. sp. 9 
latifasciatus Cresson 9 
latus n. sp. 9 
limbatus Cresson 9 
lombardse n. sp. <? 
26 
9 
24 
15 
25 
10 
32 
19 
46 
48 
20 
28 
18 
14 
20 
12 
11 
23 
36 
38 
45 
13 
41 
6 
3 
5 
47 
longicornis n. sp. $ 
magus n. sp. 9 
marlattii Dyar 9 
mendicus Walsh $ 9 
militaris Cresson 9 
monochroma Norton 9 
occidentalis n. sp. 9 
odoratus Dyar $ 9 
pacificus n. sp. 9 
pinguidorsum Dyar 9 
populi n. sp. 9 ■ 
quercus n. sp. 9 
ribesii Scop $ 9 • 
robiniie Forbes = trilineatus. 
rufocinctus Harrington 9 
salicis Ashm. = fulvicrus. 
similaris Norton = trilineatus. 
stigmatus Norton 9 
thoracicus Harrington $ 9 
tricolor n. sp. 9 
trilineatus Norton 9 
trivittatus Norton = mendicus. 
unicolor n. sp. 9 
vancouverensis n. sp. $ 9 • 
ventralis Say <? 9 
vertebratus Say $ 9 
vicinalis Cresson 9 ■ 
44 
34 
8 
w 
21) 
50 
2 
31 
4 
42 
22 
35 
27 
17 
49 
30 
16 
33 
43 
40 
7 
37 
1 
