Reprinted from: Snelling, R. 1970. STUDIES ON NORTH AMERICAN BEES OF THE GENUS
HYLAEUS. 5. THE SUBGENERA HYLAEUS. S. STR. AND
PARAPROSOPIS (HYMENOPTERA: COLLETIDAE) Contributions in Science, No. 180.
This species is very closely related to the following species. The males are especially similar in details of the hidden ventrites and genitalia.
Diagnosis: Female with head as broad as long; c1ypeus immaculate;
facial foveae ending about one-third of distance between eyes and ocelli;
mesopleural punctures separated by less than one-third a puncture diameter,
uniform in size; propodeal disc roughened and with scattered oblique rugulae;
punctures of first tergite dense, coarser than those of second. Male with head
as broad as long; lateral face marks ending abruptly a little above level of
antennal sockets; supra~lypeal mark present; lower part of face coarsely
punctate; apical portion of tergites II-VI broadly impressed, margins slightly
reflexed.
Male.-Integument black, with pure white maculae as follows: c1ypeus;
quadrate supraclypeal mark; lateral marks to a point ending about an antennal
socket diameter above upper margin of antennal sockets; medially interrupted
stripe on pronotal collar; pronotal lobe: anterior tegular spot; minute apical
spot on all femora; complete stripe on anterior tibiae: basal and apical spots
on mid and hind tibiae; all basi tarsi, except small ferruginous apical spot;
tibial spurs. Wings hyaline, veins and stigma brown. Scape entirely dark,
flagellum light ferruginous beneath. Erect pubescence whitish.
Head: UFD 0.71-0.79 x FL; LFD 0.58-0.61 x UFO; OCD 1.05-1.17 x
TFD. Distance from laterobasal c1ypeal angle to eye margin 1.3 times basal
clypeal width; distance between antennal sockets slightly less than a socket
diameter, distance from sockets to eye margins about equal to a socket diameter.
Facial integument somewhat shining, maculate areas moderately
coarsely punctate, punctures separated by one-third to three-fourths a puncture
diameter on sides of face, the punctures somewhat elongate, linearly
arranged; clypeal punctures more rounded, separated by about one-half a
puncture diameter; frontal area slightly swollen, coarsely, closely punctate, the
punctures for the most part clearly defined; vertex coarsely punctate laterally,
the punctures a little larger than those of frons; ocellar triangle and occiput in
middle dull, densely tesselate, contiguously punctate. Scape distinctly flattened,
greatest width about one-half its length, median flagellar segments about as
long as broad.
Thorax: Mesoscutal punctures a little smaller than those of clypeus, separated
by half a puncture diameter or less: mesoscutellar punctures a little
coarser, separated by about half a puncture diameter: metanotum densely
tesselate and roughened, with a few obscure punctures; mesopleural punctures
about equal to those of mesoscutellum, separated by about one-fourth a puncture
diameter. Basal area of propodeum coarsely areolate, the areolae finer
laterally; transverse and oblique carinae obsolescent: lateral area roughened,
with some indistinct punctures. a few fine rugae below at the sides.
Abdomen: Tergite I shining, coarsely punctate, punctures separated by
about a puncture diameter, with scattered micropunctures; tergite II more
finely punctate, duller, punctures separated by one-half to three-fourths a puncture diameter; apical one-third depressed, very finely and sparsely punctate,
apical margin slightly rcflexed; ventrites VIII and IX as illustrated
(figures 10H and 12A).
Length, to apex of second tergite, 3.8-4.3 mm.: of forewings, 3.15-3.50
mm.
Female.-Integument black, except yellowish-white maculae as follows:
lateral face marks, ending sJightly above level of antennal sockets; interrupted
stripe on pronotal collar; pronotal lobe; spot anteriorly on tegulae;
minute apical spot on femora; basal spot on all tibiae; tibial spurs. Underside
of flagellum light ferruginous. Erect pubescence whitish. Wings hyaline, veins
and stigma brown. A very minute ferruginous to yellowish preapical spot
sometimes present on c1ypeus.
Head: UFD 0.71-0.78 x FL; LFD 0.62-0.69 x UFD; OCD 0.81-0.92 x
TFD. Basal margin of c1ypeus about 1.8 times as wide as distance from
laterobasal angle to eye margin; distance between antennal sockets about 1.4
times a socket diameter~ distance between sockets and eye margin sJightly
exceeding a socket diameter. Clypeus reticulate-Iineolate, with fine punctures
separated by a puncture diameter or more; supraclypeal area Iineolate, with
punctures separated by about a puncture diameter: maculate portions of face
finely punctate, punctures somewhat elongate, linearly arranged; frontal punctures
coarse, contiguous, becoming finer toward midline; occiput and ocellar
triangle densely tesselate between coarse, close punctures; genae striatopunctate.
Median flagellar segments broader than long.
Thorax: Mesosclltum dull, finely tesselate with punctures subequal to
those of c1ypeus, separated by one-third a puncture diameter or less; mesoscutellar
punctures about equal to those of mcsoscutum, separated by about
one-half a puncture diameter; metanotum somewhat granulose, punctures
subequal to those of mesoscutum, separated by a puncture diameter or more;
mesopleural punctures finer than those of c1ypeus, separated by about onehalf
a puncture diameter; propodeal basal area coarsely areolate, the areolae
finer laterad; transverse carina present by poorly indicated, oblique carina
barely evident; lateral areas strongly roughened; disc obliquely striolate.
Abdomen: Tergite I smooth, shining. finely punctate, punctures separated
by a puncture diameter or more; tergite II smooth, shining, very finely
punctate, punctures separated by one and one-half to two times a puncture
diameter.
Length, to apex of second tergite, 3.95-4.35 mm., of forewings, 3.70-
3.95 mm.
Holotype male, allotype female (Los Angeles County Museum of Natural
History); Craters of the Moon National Monument, Idaho, Aug. 21. 1964
(D. S. Horning, Jr.), on Chrysothamlllls llaliSeOSliS.
Paratypes, all from the type locality, collected by D. S. Horning. Jr., dates
ranging from July 3 to Sept. 5: 23 iJ 6', 12 ~ ~. Host associations: Chrysothamllus v;scid;florus, C. nauseosus, Chamaebatiaria millejolium, Senecio
serra, Eriogonum ovali/olium, Phacelia leucophyl/a and Populus tremuloides;
two males taken on Aug. 17, 1965 are marked "prey of Ph-2." Paratypes in
United States National Museum, University of Idaho and the Los Angeles
County Museum of Natural History.
The specific name for this species is derived from the type locality.
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