Phytobia confessa Spencer (new to 
U.S.A.) 
(Figs. 463, 464) 
Phytobia confessa Spencer, 1969a: 
105. Holotype male from 
Saskatchewan in CNC. 
This species has previously been known 
from Alberta, Manitoba, and Saskatache- 
wan. Three specimens can now be re- 
corded from Utah. 
JP. confessa belongs to a compact group 
comprising P. indecora from Illinois 
and JP. vanduzeei from California. The 
three species have C ending at vein 
R 4+5 and the same type of genitalia. 
However, distinct external differences 
can be associated with significant 
differences in the male genitalia, as 
indicated in the key (pp. 73, 74). 
Material seen. 
Utah, Box Elder Co., Willard Bay, 1 
m. , Malaise trap, 11. VIII. 66 (K. 
Capelle) ; Cache Co., Logan Canyon, 1 
f.. Malaise trap, 30. VIII. 65; Cache 
Co., Green Canyon, 1 f.. Malaise 
trap, 26.VII-2.VIII.73; (both W. J. 
Hanson); all in USU. 
Phytobia pallida Spencer, new species 
(Figs. 458, 459) 
Head. Frons 1.5 times width of eye, 
not projecting above eye in profile; 2 
ors, 1 or 2 ori, lower, when present, 
distinctly included, orbital setulae 
minute, sparse, reclinate; gena 
narrow, about 0.125 height of eye; 3d 
antennal segment small, round, arista 
long, appearing bare. 
Mesonotum. 3+1 dc , 1st and 2d strong, 
3d and 4th weak, sometimes little 
differentiated from acr, equidistant 
each side of suture, acr irregularly 
in 8 rows in front , sparse behind 2d 
dc . 
Wing. Length 2.1 mm in male, 2.5 mm 
in female, C extending strongly to 
M 1+2, last section of M 3+4 about 
0.67 penultimate, inner crossvein at 
midpoint of discal cell. 
Color. Frons sooty black, rarely 
slightly paler, faintly brownish; 
lunule silvery; antenna black; 
mesonotum broadly yellow centrally to 
level of 2d dc; outer band of black, 
narrowly divided at rear, with both 
supra-alars just on yellow; scutellum 
yellow; side of thorax largely bright 
yellow, humerus with small central 
dark spot, mesopleuron with triangular 
black patch filling lower front corner 
and extending along lower and front 
margins; sternopleuron black; legs 
black; abdomen largely yellow but 
tergites 4-6 with slightly variable 
blackish area centrally; squama 
yellow, margin and fringe black. 
Male genitalia. Aedeagus (figs. 458, 
459) pale, scarcely pigmented; 
sternite 9 rounded apically, slightly 
U-shaped; surstylus discrete, rounded, 
with fringe of hairs on inner margin; 
aedeagal apodeme pale; sperm pump with 
narrow blade and base having circular 
area of strong sclerotization at each 
end. 
Host/early stages. Unknown. 
Holotype m. , Arizona, Yuma Co., Bill 
Williams Fork, "Aug."; paratypes 1 f., 
same data; 1 m. , 1 f., same locality, 
"Sept." Holotype and paratypes in 
USNM. 
Remarks. This species closely re- 
sembles P. picta (Coquillett , 1902), 
described from southern Mexico, but is 
smaller. In a key to neotropical 
species, Spencer (in Spencer and 
Stegmaier, 1973: 174) gave the wing 
length of JP. picta as 2.5-3. 1 mm. The 
male genitalia of the two species, 
although of the same general form, 
differ substantially in detail (loc. 
cit.: figs. 444, 445). 
Malloch (1913a: 275) referred to a 
female of a species in this group from 
New Mexico in the USNM, but the 
specimen cannot be found and it is 
impossible to decide whether it 
represents P. pallida or one of the 
other black and yellow species known 
from Central America and Mexico. 
271 
