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 bears a strong resemblance to H. calvus in most features.
The male differs from that of H. calvIIs externally in having the punctures on
the dorsal surface of the first tergite sharply defined, the interspaces smooth
and shining, while in H. calvlIs the punctures are obscured due to the strongly
tesselated and roughened interspaces. The female of H. timberlake; has the
declivity of the propodeum with coarse, oblique rugulae (absent or poorly
defined in H. calvIIs) and the punctures of the first tergite are moderately
dense and distinctly larger than those of the second tergite (sparse, finer than
those of second tergite in H. calvlls).
Diagnosis: Female with head broader than long; c1ypeus maculate; facial
foveae ending slightly less than halfway between eyes and ocelli; punctures of
mesopleura separated by more than a puncture diameter, uniform in size;
rugulae of propodcal declivity coarse, obliquely directed toward mid-line;
punctures of first tergite dense, distinctly larger than those of second tergite.
Male with head slightly broader than long; lateral face marks ending rather
broadly on eye margin about midway between level of antennae sockets and
median ocellus; supraclypeal mark present; punctures on lower part of face
coarse; apical margin of second tergite broadly impressed, very finely and
sparsely punctate.
Male.-Integument black, with creamy-white maculae as follows: c1ypeus;
triangular supraclypeal mark; lateral face marks, ending broadly on
inner eye margins, about midway between level of antennal sockets and
middle ocellus; pronotal collar, interrupted medially; spot on pronotal lobe;
anterior spot on tegulae; small apical spot on all femora; complete outer
stripe on anterior tibiae; basal and apical spots on middle and hind tibiae; all
basi tarsi (usually with distinct apical infuscation). Anterior medio- and
distitarsi ferruginous, middle and hind medio- and distitarsi fuscous to black.
Tibial spurs yellowish. Wings, hyaline. veins and stigma brownish. Scape all
black; pedicel with reddish-yellow apical spot beneath; flagellum yellowish
beneath, reddish-brown above. Erect pubescence whitish.
Head: UFD 0.70-0.77 x FL; LFD 0.50-0.61 x UFD; OCD 1.00-1.11 x
TFD. Distance from latero-basal c1ypeal angle to eye margin 1.3 times basal
c1ypeal width; distance between antennal sockets slightly more than a socket
diameter, distance from sockets to eyes slightly more than a socket diameter. Facial integument dull, maculate areas coarsely punctate, punctures separated
by a puncture diameter or less; frontal area slightly swollen, coarsely
rugosopunctate; vertex and genae coarsely continguously punctate. Scape
somewhat distinctly flattened, greatest width about one-half its length; median
flagellar segments about as long as broad, or slightly longer.
Thorax: Mesoscutal punctures finer than those of vertex, separated by
half a puncture diameter or less, interspaces tesselate and dull; punctures of
mesoscutellum coarser than those of mesoscutum, about equal to those of
vertex, separated by about half a puncture diameter on disc, apical one-fifth
of the segment dull, densely rugosopunctate; metanotum dull, rugosopunctate;
mesopleural punctures about equal to those of mesoscutellum, separated by
one-fourth a puncture diameter or less. Basal area of propodeum areolate, the
ridges sharply defined by very irregular; lateral area rugulose; disc rugulose
laterally, with a few poorly defined oblique rugae medially; transverse carina
present across basal area, oblique carina poorly defined. Outer margin of fore
coxa subangulate basally to evenly convex.
Abdomen: Tergite I shining, densely punctate, punctures a little smaller
than those of mesoscutum, separated by one-half to three-fourths a puncture
diameter; punctures of tergite II a little finer, separated by about one-half a
puncture diameter or less; apical one-third to one-fourth of tergite II depressed,
brownish, transversely lineolate, with scattered very fine punctures;
ventrites VIn and IX as illustrated (figures 10J and 12B).
Length, to apex of second tergite, 3.8 to 4.3 0101.; of forewings, 2.6 to
3.0mm.
Female.-Integument black, except for yellow maculae as follows:
median c1ypeal macula, varying from small preapical spot to broad vertical
stripe, broad lateral face marks, ending slightly above antennal sockets;
medially interrupted stripe on pronotal collar; large spot on pronotal lobe;
triangular spot anteriorly on tegulae; basal spot on all tibiae. Underside of
flagellum light reddish. Erect pubescence whitish. Wings hyaline, veins and
stigma brownish.
Head: UFD 0.77-0.84 x FL; LFD 0.61-0.66 x UFD; OCD 0.81-0.91 x
TFD. Basal margin of c1ypeus 1.5 times as wide as distance from laterobasal
angle to inner margin; distance between antennal sockcts 1.5 times a socket
diameter; distance from socket to eye margin 1.3 times a socket diameter.
Clypeus finely reticulate, with small punctures over most of the disc separated
by about a puncture diameter, becoming denser, coarser, more elongate toward
apical margin; supraclypeal area lineolate, somewhat roughened above, with
scattered obscure punctures; maculate portions of sides of face lineolate, with
fine punctures separated by one-half to a full puncture diameter; frons coarsely,
contiguously punctate, becoming finely, but very densely punctate on
vertex, especially in ocellar triangle and behind; gcnal punctures obscure, a
little larger than those of c1ypeus. Flagellar segments broader than long. Thorax: Mesoscutum dull, finely tesselate with punctures finer than those
of frons, separated by about one-half a puncture diameter on disc; mesoscutellum
a little shinier, punctures variable, but mostly about same size as those of
mesoscutum, some a little larger, mostly separated by about a puncture diameter;
metanotum dull, rugulose; mesopleura bipunctate, i.e., with punctures
of two sizes, the larger ones equal to those of mesoscutum, punctures variably
spaced, but most separated by about a puncture diameter. Basal zone of
propodeum coarsely areolate; transverse, oblique and lateral carinae distinct;
disc finely rugulose above, the rugulae becoming coarser, oblique, below.
Outer margin of fore coxa evenly convex, without basal angulation or spine.
Abdomen: Tergite I shining, smooth, finely punctate, the punctures separated
by a puncture diameter or more; tergite II shining, very finely reticulate,
punctures finer than those of tergite I, separated by from one to one and onehalf
times a puncture diameter; remaining tergites increasingly more distinctly
reticulate, with scattered micropunctures.
Length, to apex of second tergite, 4.5-5.1 mm.; of forewings, 3.5-
4.0mm.
Holotype: Male (Los Angeles County Museum of Natural History);
Forest Hill, 12 mi. E., Placer Co., Calif., June 24, 1962 (R. R. Snelling), on
Ceanothus. Allotype: Female (University of California, Riverside); Tyler,
4.5 mi. W., Nevada Co., Calif., Sept. 27, 1956 (P. H. Timberlake), on
Haplopappus. This species is dedicated to Professor P. H. Timberlake, in recognition
of his eminence in apoid systematics. and of the generous assistance he has
given to me over many years. Professor Timberlake had recognized this
species as new and with characteristic generosity permitted me to describe it.
VARIATION: In the females, the clypeal maculation varies a great deal.
Some have the spot so minute as to be barely perceptible and other have it
so developed as to occupy as much as 75% of the total area. The Eagle Creek
female has the rugulae of the propodeal declivity confined to the lower onethird.
The males of this species are remarkably uniform structurally. They do
possess a melanic form which strongly resembles that of such species as H. calvus and H. polifolii, but may be separated from these by the characters
in the key.
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