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Hylaeus sonorensis Cockerell, 1924
Hylaeus sonorensis var melanorhinus Cockerell, 1924

Life   Insecta   Hymenoptera   Apoidea   Colletidae   Hylaeus
Subgenus: Paraprosopis


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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.

Diagnosis: Although the superficial appearance of this species is quite similar to that of H. asininus (Cockerell & Casad), the shape of ventrites VIII and IX of the male ally it to H. wootoni (Cockerell). Both sexes differ from H. asininus in the more elongate face, denser and finer thoracic punctures and microscopic punctures of tergite II. From H. wootoni this species differs in the longer, narrower face, more finely punctate abdomen and more extensive maculae.

Male.-Integument black, except the following pale creamy-white; elongate spot at base of mandibles; labrum, cIypeus; elongate suprac1ypeal mark; paraocular areas and along inner orbits, ending acutely on level midway between anterior ocellus and antennal sockets; entire transverse stripe on pronotal collar; pronotal tubercules; anterior half of tegulae; apical spot on all femora; entire fore tibiae except irregular blotch on inner surface; basal half of middle tibiae; basal three-fifths of hind tibiae; all basitarsi and first hind mediotarsal segment. Underside of flagellum yellowish-ferruginous. Medioand distitarsal segments brownish; wings clear hyaline, veins and stigma brownish. Pubescence all pale whitish, on abdomen suberect and obscure.

Head: UFD 0.64-0.65 x FL; LFD 0.59-0.60 x UFD; OCD 1.19-1.21 x TFD; clypeus distinctly narrower basally than distance from latero-basal angle to eye margin; distance between antennal sockets less than socket diameter, distance from sockets to eye margins equal to socket diameter; clypeus, supraclypeal area and maculate facial area dull, densely tesselate, with scattered obscure punctures; non maculate areas with large, subcontiguous punctures, the densely tesselate interstices slightly shining; genae shining, punctures small, separated; minimum length of first flagellar segment about one-half length of second.

Thorax: Outer margin of fore coxae slightly convex; mesopleural punctures about equal to those of frons, mostly separated by about one-half a puncture diameter, the tesselate interstices more shining than frons; mesoscutal punctures equal to those of frons, subcontiguous, interstices slightly shining; mesoscutellar punctures larger than mesoscutal, spacing variable, but denser medially; metanotum not at all shining, very densely tesselate, with a few, coarse, deep punctures. Basal area of propodeum with a few irregular striae, the lateral ones transverse; latero-basal area roughened, shining, impunctate; lateral area slightly shining, with coarse, close punctures; oblique carina absent; lateral carina feebly developed, absent above lower half of disc.

Abdomen: Tergite I micro-tesselate, slightly shining, with fine punctures mostly separated by about a puncture diameter; tergite II more distinctly tesselate, punctures very fine, obscure, separated by about a puncture diameter; remaining tergites tesselate, slightly shining, with a few, scattered, obscure punctures; ventrites VIII and IX as in figures 10K and 11 L.

Measurements: Body length (front of vertex to apex of second tergite), 3.5 to 3.8 mm.; forewing length, 2.9 to 3.1 mm. Female.-Similar to male in sculpture and color, except as follows: mandibles and labrum entirely dark; clypeus with -L-shaped macula; supraclypeal area with small irregular mark; lateral face marks more rounded above; facial foveae ending about one-third of distance between eyes and lateral ocelli; UFD 0.69-0.70 x FL; LFD 0.68-0.70 x UFD; OCD 0.94-0.96 x TFD; distance between latero-basal c1ypeal angle and inner eye margin 0.75 times basal width of c1ypeus; distance between antennal sockets equal to a socket diameter and to distance between sockets and eyes. Fore basitarsus concolorous with medio- and distitarsi, hind basitarsus dark at apex. Punctures of tergite I a little finer and more separated than in male.

Measurements: Body length (front of vertex to apex of second tergite), 4.5 to 4.7 mm.; forewing length, 3.4 to 3.7 mm. Both forms of H. sonorensis were described by Cockerell from single females from Guaymas, Sonora, Mexico; I have examined the types of both at the California Academy of Sciences and can affirm that they are conspecific. Although Cockerell claimed this species to be related to those of tropical Mexico, this is not true. On the basis of currently available specimens H. sono~ensis ranges from the Death Valley region of California and Nevada into southern Arizona, thence south into Sonora, Mexico at least as far as Guaymas. Another extension intrudes into Baja California at least as far as Bahia de Los Angeles.

The variety melanorhinus was distinguished by the lack of a supraclypeal mark and the reduction of the clypeal macula to a transverse apical band with a median upward extension. In the "typical" form the apical third of the clypeus was pale yellowish with a broad, cuneate upward extension. Such variants are common in the series of females available and there seems to be no good reason for the recognition of these variant forms, since the variations are not correlated with distribution.


Names
Scientific source:

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Hosts · map
FamilyScientific name @ source (records)
Brassicaceae  Stanleya pinnata @ BBSL (1); UCRC_ENT (6)
Fabaceae  Prosopis glandulosa @ UCRC_ENT (1)

Prosopis juliflora @ BBSL (1); UCRC_ENT (1)

Prosopis @ AMNH_BEE (1)
Polygonaceae  Eriogonum inflatum @ UCRC_ENT (29)

Eriogonum sp @ BBSL (1)
Zygophyllaceae  Larrea tridentata @ BBSL (3)
_  Withheld @ BBSL__ZION (3)

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Updated: 2024-03-29 16:02:55 gmt
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