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Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea)

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Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Bulletin of the University of Nebraska State Museum Museum, University of Nebraska State 10-1968 Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) David O. Ribble Follow this and additional works at: https://digitalcommons.unl.edu/museumbulletin Part of the Entomology Commons, Geology Commons, Geomorphology Commons, Other Ecology and Evolutionary Biology Commons, Paleobiology Commons, Paleontology Commons, and the Sedimentology Commons This Article is brought to you for free and open access by the Museum, University of Nebraska State at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Bulletin of the University of Nebraska State Museum by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. BULLETIN OF VOLUME S , NUMBER S The University of Nebraska State Museum OCTOBER. 1968 David W. Ribble Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) David W. Ribble Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) BULLETIN OF The University of Nebraska State Museum VOLUME 8, NUMBER 5 OCTOBER 1968 ACKNOWLEDGMENTS I would like to express my deep appreciation to Dr. W. E. LaBerge of the Illinois Natural History Survey, Urbana (formerly of the University of Nebraska, Lincoln), for his interest, encourage­ ment and guidance during the course of this study, and for reading and making suggestions in the manuscript. Thanks are due Dr. R. E. Hill, who kindly assumed the responsibilities of committee chair­ man on Dr. LaBerge's departure. Appreciation is also due Dr. W. T. Atyeo of the Nebraska State Museum, University of Nebraska, Lin­ coln, who has given much helpful advice and has read and com­ mented on the manuscript. A debt of gratitude is due the following persons who have allowed types in their care to he examined: Dr. J. G. Rozen, Jr., American Museum of Natural History, New York City; Mr. P. H. Timberlake, University of California, Riverside; Dr. K. V. Kromhein, U. S. National Museum, Washington, D. C.; Dr. E. S. Ross, California Academy of Sciences, San Francisco; and the late Dr. H. G. Grant, Jr., Academy of Natural Sciences of Philadelphia. To the many contributors of specimens and individual collectors who made this study possible, I am deeply grateful for their gener­ ous cooperation. Sources of material having type specimens are listed in the Material Studied section. Especial thanks are also due G. B. Butler, E. F. Cook, M. T. James, J. L. Laffoon, R. A. Morse, C. W. Rettenmeyer, R. B. Roberts, A. F. Shinn, W. P. Stephen, R. W. Thorp and G. E. Wallace. Dr. E. A. Cross, Northwestern State College, Natchitoches, Louisiana, kindly identified the mites associated with Micrandrena and Derandrena. Financial support from National Science Foundation grants to W. E. LaBerge for the study of the systematics of North American Andrena is very much appreciated. The Illinois Natural History Survey generously supplied working facilities during the terminal stages of this study. TABLE OF CONTENTS INTRODUCTION .. 237 BIONOJ\IICS ... ........................... 238 MATERIAL STUDIED ..... ·······238 TAXONOMIC CHARACTERS AND METHODS .... 239 SUBGENUS MICRANDRENA ASHMEAD.. .. 242 Diagnosis of M icrandrena ... .... 244 Key to the species of Micrandrena ·········245 Group I-the piperi group ... 248 Group II-the illinoiensis group ....... .... 299 Group III-the primulifrons group 325 SPECIES INCORRECTLY PLACED IN THE SUBGENUS MICRANDRENA ....................................................... 332 SUBGENUS DERANDRENA, NEW SUBGENUS .. .... 333 Diagnosis of Derandrena .. ........ ......... 334 Key to the species of Derandrena ... ...... 336 BIBLIOGRAPHY .... ···················368 MAPS . 371 FIGURES 382 INDEX ........................ 394 BULLETIN OF The University of Nebraska State Museum VOLUME 8, NUMBER 5 Pp. 237-394 Figs. 1-124 Maps 1-18 OCTOBER 1968 ABSTRACT Revisions of Two Subgenera of Andrena: Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) DAVID w. RIBBLE This paper is a monographic rev1S1on of the bee subgenera Micrandrena Ashmead and Derandrena, new subgenus, of the genus Andrena in North Amer­ ica. Both subgenera occur in the New World and Micrandrena also occurs in the Old ,vor!d. Twenty-eight species are treated, of which twelve are new: Andrena (Micrandrena) annectens, ishii, [abergei, lamelliterga, lepidii, micheneri, Andrena (Derandrena) arctostaphylae, californiensis, hermosa, murietae, penuti­ ani, viridissima. Thirteen names are placed in synonymy: Andrena semotula Cockerell with candidiformis Viereck and Cockerell; subtilicornis Viereck, nitidi­ cornis Cockerell, chlorogaster nesiotes Timberlake, chlorogaster gavilanica Tim­ berlake, radialis Timberlake, catalinica Cockerell with chlorogaster Viereck; vegana Viereck and Cockerell with illinoiensis Robertson; fragariana Graenicher with melanochroa Cockerell; salicinellina Viereck and Cockerell, abacta Viereck with nigrae Robertson; solutula Cockerell with vandykei Cockerell; vernalis Mitchell with ziziae Robertson. Three species are reassigned to the subgenus Thysandrena: Andrena cercocarpi Cockerell, chlorine/la Viereck, haroldi Timber­ lake. One species Andrena nothoscordi is removed from Micrandrena and re­ mains unassigned. Although primarily a taxonomic study, this work brings together available data concerning distribution, biological information and flower preferences. A total of 10,054 bees were examined during this study. CONTRIBUTION OF the Department of Entomology (No. 283), College of Agricul­ ture, and the Division of Entomology 0/ the University of Nebraska State Museum. RIBBLE1 Revisions of Two Subgenera of Andrena~ Micrandrena Ashmead and Derandrena, New Subgenus (Hymenoptera: Apoidea) INTRODUCTION The genus Andrena Fahricius is primarily a holarctic group of short-tongued bees (Friese, 1909, map 12). Only a few species are known to occur in the tropics or Southern Hemisphere. A ndrena is a very large genus in number of species and has not been exten­ sively studied. The latest North American catalogs (Linsley, 1951; Kromhein, 1958) list over 500 species and subspecies, and there are probably at least as many Andrena species in the Old World. Since Andrena is large, taxonomists find it convenient to divide the group into numerous subgenera. Hedicke (1933) has a good dis­ cussion on earlier attempts to divide Andrena into species groups or subgenera, and places the palearctic species of A ndrena in 22 subgenera. Lanham (1949) is first to do a similar study using the New World species. Lanham uses 31 subgenera and bases his classi­ fication mainly on the female sex. LaBerge (1964) brings the males into consideration and rearranges Lanham's subgenera somewhat, and includes 34 subgenera. Lanham's and LaBerge's papers deal mostly with North American material. La.Berge is further rearrang­ ing the subgeneric classification and now feels there should he 45 to 50 North American subgenera (unpublished). Additionally, he is beginning an intensive study of European and Oriental collections and it is anticipated that further changes in subgeneric classification will he made. The subgenera of A ndrena in many cases are difficult to sepa­ rate. The many species of Andrena have undergone extensive evo­ lution, both convergent and divergent, thus the "gaps" between subgenera have been filled, with consequent difficulties in separating subgenera. Ultimately one must decide whether it is best to have a few large, relatively distinct, and perhaps polyphyletic subgenera in Andrena, or more smaller (though often still large for bees) sub­ genera which, though more convenient to work with, are often difficult to separate. 1 Research Assistant, Illinois Natural History Survey, Urbana. 237 Bulletin of the University of Nebraska State Museum In 1963 I undertook the revision of the subgenus M icrandrena Ashmead, but it soon became apparent that this taxon as defined by Lanham (1949) contained three unrelated groups of bees: Mi­ crandrena (s. str.), Larandrena LaBerge and Deranderna, new sub­ genus. The subgenera Michandrena and Derandrena are treated herein, a revision of the monotypic subgenus Larandrena has been completed (Ribble, 1967). Previously 50 specific and subspecific names have been included in Micrandrena. Lanham (1949) removed one name to Elandrena Lanham. LaBcrge (1964) erected a new subgenus, Larandrena, for miserabilis and by implication also removed the eight synonyms of miserabilis to Larandrena. In this present study four names (repre­ senting three species) are placed in a new subgenus (Derandrena), three names are transferred to Thysandrena Lanham, and one name is removed from these subgenera and will probably be placed in a new subgenus at a future date. Of the 32 names remaining in Mi­ crandrena, seven have been previously placed into synonymy by earlier workers and 12 names are herein considered as junior syno­ nyms. To the remaining 13 valid names in Micrandrena, six new names are added. Six new names are also added to Derandrena. BIONOMICS Very little is known about the bionomics (biology) of either M icrandrena or Derandrena. The bionomical information that is available for a species is here included after the Variation section of that species. One would assume from what is known about other members of the genus Andrena
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