made to confirm the presence of 
Phytobia on Coniferae by rearing 
adults or at least discovering larvae 
or larval remains. 
One new species, described here from 
Arizona, is of interest as the only 
species in the United States with a 
yellow scutellum, which associates it 
with a number of others with this 
character in Central America. 
One species previously known in Canada 
has been identified from Utah, and one 
new synonym is established (part 2, 
p. 270). No additional species are 
known in Canada. 
Key to Phytobia 
Species 
1. Scutellum dark, black or gray 2 
Scutellum yellow P. pallida Spencer, n. sp. 
Synopsis. Frons black, lunule silvery; mesonotum 
broadly yellow centrally, scutellum entirely yel- 
low; side of thorax largely yellow; legs black; 
abdomen predominantly yellow but hindtergites 
blackish centrally; squama yellow, margin and 
fringe black; male genitalia with aedeagus as in 
figures 458, 459. 
Host/Early Stages. Unknown. 
Distribution. Arizona. 
Reference. Part 2, p. 271. 
2 (1). Costa extending only to vein R 4+5 
Costa extending to M 1+2 
3 (2). Outer crossvein present 
Outer crossvein lacking 
4 (3). Last section of M 3+4 1.5 times length of penulti- 
mate P. pruni (Grossenbacher) 
Synopsis. (From Malloch's 1915b redescription; no 
specimens are now traceable.) Frons somewhat wider 
than eye, not projecting above eye; 2 ors, 3 ori; 
gena about 0.17 height of eye; 3d and 4th dc 
small, anterior pair well in front of suture, prsc 
l en 8bh of 1st dc ; frons blackish, becoming 
brown in front, there similar to 3d antennal seg- 
ment and palpus; wing length 3.5-4 mm, costa 
ending shortly after vein R 4+5, last section of 
M 1+2 1.5 times penultimate; inner crossvein well 
beyond center of discal cell, little more than own 
length from outer; male genitalia unknown. 
Host/Early Stages. Crataegus sp., Prunus avium , P. 
domes tica . Larva feeding in cambium of previous 
year's growth of stem, pupating externally near 
ground level; eggs laid in mid-June, larvae feed 
until autumn, overwintering in stem, completing 
feeding the following spring. 
Distribution. New York. 
References. Grossenbacher, 1915: 227-238; Malloch, 
1915c: 349; Frick, 1959: 376. 
Last section of M 3+4 2.5 times length of penulti- 
mate ^ 
5 (4). Frons not projecting above eye P. indecora (Malloch) 
Synopsis. Frons matt black, 1.5 times width of 
eye; orbit only weakly shining, with 2 ors, 3 ori; 
lunule gray; gena narrow, 0.125-0.10 height of 
73 
-P" 00 oj 
