D I S C O V E R    L I F E   
Bee Hunt! Odonata Lepidoptera 
  HomeAll Living ThingsIDnature guidesGlobal mapperAlbumsLabelsSearch
  AboutNewsEventsResearchEducationProjectsStudy sitesHelp


Hylaeus granulatus (Metz, 1911)
Prosopis rudbeckiae var granulatus Metz, 1911

Life   Insecta   Hymenoptera   Apoidea   Colletidae   Hylaeus
Subgenus: Hylaeus


Click on map for details about points.

IDnature guide

Links
Overview
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.

Although this closely resembles H. rudbeckiae, it may be recognized by the features of the eighth and ninth ventrites (fig. 4A, D). External features do not appear to be reliable since both species are so variable. The following differences have been noted as tendencies which may be of value. The antennal and thoracic maculae of H. granulatus are less extensive than is usually true of H. rudbeckiae. In H. granulatus the scape may be black or with a small, basal spot on the lower margin; the pronotal collar may be immaculate or with a pair of minute yellowish spots at the extreme sides; the pronotallobes are onehalf, or more, black; the tegulae may be either black or with a small median spot. In H. rudbeckiae these areas are usually conspicuously maculate, except in specimens from northern or high altitude sites. The metanotum of both species is dull, but in H. granulatus it is rugosopunctate, while in H. rudbeckiae it has fine sparse rugulae and a few distinct scattered punctures. In H. rudbeckiae the basal zone of the propodeum is coarsely rugose, with the rugae in the median portion basically parallel. The basal zone of H. granulatus may be coarsely and irregularly rugulose, or with fine rugulae only on the anterior half, the posterior half appearing granulose.

The status of this form is enigmatical. Metz described it from three males from Ormsby County, Nevada. No type was ever designated and so I am selecting a specimen from the original series, collected by Baker in July, as the lectotype. This specimen has been deposited in the American Museum of Natural History. Since the time of its description this bee has never been regarded as anything other than a variety of H. rudbeckiae, of which it has been considered a synonym. Its status here as a species is provisional, pending the acquisition of more material. This form may ultimately prove to be a hybrid resulting from a cross between H. rudbeckiae and H. cressoni. The extremes in variation in the sculpturing of the basal zone of the propodeum are suggestive of H. cressoni and the details of the eighth and ninth ventrites are intermediate between H. cresson; and H. rudbeckiae. If H. granulatus is a valid species, its female is currently unknown, but probably will be extremely similar to that of H. rudbeckiae.

In addition to the three males from Nevada I have seen others from scattered localities in the Sierra Nevada of California, from Lassen County to Tulare County, and from the San Gabriel Mountains in Los Angeles County. I also have a few males from Colorado which seem referrable to this form; these differ slightly, however, in the shape of the ninth ventrite which is very similar to that of H. cressoni. In areas where these specimens were taken, both H. cressoni and H. rudbeckiae are common.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apiaceae  Daucus carota @ BBSL (4)

Perideridia kelloggii @ BBSL (2)
Asteraceae  Chrysothamnus sp @ BBSL (2)

Chrysothamnus viscidiflorus @ BBSL (7)

Ericameria nauseosa @ BBSL (4)

Grindelia sp @ BBSL (1)

Solidago sp @ BBSL (13)
Fabaceae  Onobrychis viciifolia @ BBSL (1)
Hydrophyllaceae  Eriodictyon sp @ BBSL (2)

Phacelia argillacea @ BBSL (12)

Phacelia sp @ BBSL (1)
Polycitoridae  Salix sp @ BBSL (3)
Polygonaceae  Eriogonum sp @ BBSL (1)
Rosaceae  Chamaebatiaria sp @ BBSL (1)
Scrophulariaceae  Linaria sp @ BBSL (1)
_  Withheld @ BBSL (167); BBSL__ZION (65); BBSL__PINN (1)

go to Discover Life's Facebook group

Updated: 2024-03-28 17:19:30 gmt
Discover Life | Top
© Designed by The Polistes Corporation