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Natural History) , 1949, Issued Four Scientific Series, Botany, Entomology, Geology (Incorporating Mineralogy) and Zoology, and an Historical Series Bulletin of the British Museum (NaturalN MWMW9MWWHistory)%/ X - Taxonomy of Neotropical Derbidae in the new tribe Mysidiini (Homoptera) Peter S. Broomfield Entomology series Vol 50 No 1 28 February 1985 the British instituted in is in The Bulletin of Museum (Natural History) , 1949, issued four scientific series, Botany, Entomology, Geology (incorporating Mineralogy) and Zoology, and an Historical series. Papers in the Bulletin are primarily the results of research carried out on the unique and ever-growing collections of the Museum, both by the scientific staff of the Museum and by specialists from elsewhere who make use of the Museum's resources. Many of the papers are works of reference that will remain indispensable for years to come. Parts are published at irregular intervals as they become ready, each is complete in itself, available separately, and individually priced. Volumes contain about 300 pages and several volumes may appear within a calendar year. Subscriptions may be placed for one or more of the series on either an Annual or Per Volume basis. Prices vary according to the contents of the individual parts. Orders and enquiries should be sent to: Publications Sales, British Museum (Natural History), Cromwell Road, London SW75BD, England. World List abbreviation: Bull. Br. Mus. nat. Hist. (Ent.) Trustees of the British Museum (Natural History), 1985 The Entomology series is produced under the general editorship of the Keeper of Entomology: Laurence A. Mound Assistant Editor: W. Gerald Tremewan ISBN 565 06008 2 ISSN 0524-6431 Entomology series Vol50Nolppl-152 British Museum (Natural History) Cromwell Road London SW7 5BD Issued 28 February 1985 Taxonomy of Neotropical Derbidae in the new tribe Mysidiini (Homoptera) Peter S. Broomfield Department of Entomology, British Museum (Natural History), Cromwell Road, London SW7 5BD Contents Synopsis Introduction Techniques Acknowledgements Derbinae 3 Key to tribes of Derbinae 4 Mysidiini trib. n Key to genera of Mysidiini Checklist of Mysidiini Mysidia Westwood Pseudomysidia Metcalf 77 Dysimia Muir 87 Dysimiella gen. n 96 Mysidaloides gen. n 98 Neomysidia gen. n 99 Ipsemysidia gen. n 100 Amysidiella gen. n 101 Paramysidia gen. n 103 Symidia Muir 108 References Ill Index 151 Synopsis The subfamily Derbinae is divided into two tribes, the Derbini and Mysidiini, the latter newly described. Six genera and 136 species are described as new, one subspecies is raised to specific status, four specific synonymies and four combinations are newly established, and one neotype and 17 lectotypes are designated. Keys to the tribes, 10 genera and 182 species are provided. Introduction The Derbidae is one of the largest and least-known families of the Fulgoroidea, with probably less than one-fifth of the species currently recognised. It is world-wide in distribution, and the majority of the genera and species are confined to the tropics. The biology of the Derbidae is little known. The adults are phloem feeders, occurring on a wide variety of trees and shrubs, in grass land, and occasionally on cultivated cereals. In the U.S.A., Dozier (1928) recorded them feeding on numerous species of deciduous trees, frequently in moist situations. In the New World tropics they often appear to be randomly scattered throughout primary and secondary forest, although individual species may occur in very large numbers in plantations. There is little information on their host specificity, and they are of no known major economic importance. The nymphal stages, which are almost completely unknown, are frequently associated with decaying vegetation, and are often numerous amongst the litter of the forest floor or in plantations and orchards. They have been found by the present author in old beetle galleries in rotten timber, which suggests that they feed on fungal exudates. Bull. Br. Mus. nat. Hist. (Ent.) 50 (1): 1-152 Issued 28 February 1985 2 PETER S. BROOMFIELD The family-group name Derbidae was first proposed by Schaum (1850), with Derbe Fabricius (1803) as the type-genus. The family was divided into the Derbinae and Kermesiinae by Kirkaldy (1906), but subsequently the latter subfamily was rendered obsolete when Kermesia was shown to be more correctly placed in the Meenoplidae. Westwood (1840) divided Derbe into seven subgenera: Derbe, Mysidia, Zeugma, Thracia, Phenice, Patara and Cenchrea, all of which have subsequently been raised to generic status. In 1900 Kirkaldy proposed the name Zoraida as a replacement name for Thracia, the latter being preoccupied. Muir (1913), studying the Old World fauna, ignored the subfamilies and divided the family into four 'groups' based on tegminal venation. Later (1917) he rearranged these groupings into the subfamilies Derbinae, Otiocerinae, Cenchreinae and Rhotaninae, including in the Derbinae the genera Zoraida, Zeugma, Mysidia and Sikaiana. In 1918 Muir revised his classification as a result of his study of New World material. Still using characters of the wing and tegminal venation, he separated Zoraida and related genera into a distinct subfamily, the Zoraidinae, which he divided into the tribes Zoraidini and Sikaianini, and relegated the Cenchreinae, Otiocerinae, Derbinae and Rhotaninae to tribes within the Derbinae. This arrangement was confirmed in 1930 and was subsequently followed by Metcalf (1938). Of Westwood's original seven subgenera of Derbe, Muir (1930) assigned Derbe, Mysidia and Zeugma to the Derbini, though he had recognised (1913) that, with the inclusion of Zeugma, such a grouping was not a natural one. Metcalf (1938) erected Pseudomysidia and included it in the Derbini. This classification was accepted by Metcalf (19456), and revised by Fennah (1952) who, also using the venation of the tegmina and wings, omitted the subfamily groupings and divided the family directly into the tribes proposed by Muir (1918). Recognising their true affinities he transferred Zeugma to the Zoraidini, and Symidia and Dysimia from the Cenchreini to the Derbini. However, by ignoring subfamilies this classification restricts the grouping of taxa to only two levels below that of family, and does not acknowledge the relationship between the Zoraidini and Sikaianini. In the present study of the Derbini (sensu Fennah, 1952), the male genitalia have been examined in order to evaluate their importance as taxonomic characters in the group; a secondary objective was to investigate the generic groupings, and to propose a classification whereby the affinities of these genera might be more clearly expressed. Techniques The characters of the head may occasionally be obscured by deposits of white wax, which may be removed with a fine paint brush. The measurements in the species descriptions are taken with the insect in dorsal aspect; the width includes the eyes, and the length is from the base to the apex of the anterior extension. In most cases the vertex and frons merge imperceptibly into each other, and the length of the vertex is therefore not included. The length of the frons is assumed to be from its base to a point level with the dorsal margins of the eyes. The proportions of the thorax, and the presence or absence of carinae on the frontal and dorsal surfaces, are important at specific level. These are best observed under incident light at an angle of 45 to the surface under examination. The length of the abdomen varies according to the condition of the specimen. For this reason 'whole body' measurements are unreliable and are not provided. The pigmentation of the tegmen and wing is frequently faint and occasionally obscured by waxy deposits; it is best observed at low magnification in natural light, against a white background. Frequently, specimens stored in alcohol rapidly lose all pigmentation. For this reason extensive use has been made of characters of the male genitalia, the diagnostic features of which are heavily sclerotised and do not require staining. The method of preparation of the male genitalia is similar to that employed for those in the majority of auchenorrhynchous Homoptera. The abdomen is best removed entire at its junction with the thorax. After softening in heated 10% KOH, the abdomen is macerated in glacial acetic acid, cleared in clove oil, cleaned in alcohol, and examined in glycerine. Usually the characters of the aedeagus and parameres may then be observed without further dissection. The aedeagus is best examined from several aspects, so that permanent preparations are not recommended; TAXONOMY OF NEOTROPICAL DERBIDAE IN THE NEW TRIBE MYSIDIINI (HOMOPTERA) 3 the lateral aspect is sufficient for examination of the parameres. The female genitalia are not used in the present study. The terms used in the text are those commonly employed for the Fulgoroidea and are based largely on those of Kramer (1950). Acknowledgements I thank the following individuals for their assistance in making available to me the material upon which much of this study is based, for the opportunity to examine type-material and, in many cases, for most helpful advice. The institutions are referred to in the text by the abbreviations given in parenthesis: Dr N. M011er Andersen, Zoologisk Museum, Copenhagen (ZM); Dr P. Arnaud and Dr D. Rentz, California Academy of Science, San Francisco (CAS); Dr R. G. Fennah, formerly of the Commonwealth Institute of Entomology, London; Dr K. G. A. Hamilton, Agriculture Canada, Ottawa (AC); Dr J. P. Kramer, United States National Museum, Washington D.C. (USNM); Dr I. Lansbury, University Museum, Oxford (UM); Dr P. Lindskog, Naturhistoriska Riksmuseet,
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