CLASS V. INSECTA. 
267 
■Length of the body 5—5* lines, expansion of the wings 10—11 lines, 
inhabits Germany and England : in the latter it is very rare, and has 
only been found near Bristol. 
Genus 421. LYDA. Fubr., SpinoL, Klug., Leach. Pampiiilivs. 
Lair., Le.ach, Edinb. Encycl. vol. ix. 141. Cepbaleia. Jurine 
Libia, the four posterior furnished on the inside with a single spine 
near the middle and a double one beneath. 
Larva with no spurious feet. 
Lydffi. Klug. 
Sp. 1. Lyda Petulee. 2. Lyda erythrocephala, SfC. 
Genus 422. LOPHYRUS. Latr., Leach. Pterontis. Jurine. Hr- 
lotoma . Fubr. Tenthredo. Linn ., JDe Geer, Qltv., Lain., 
Panz. 
Antenna pennated in the males; serrated in the females : superior wings 
with one marginal and three submarginal cells : mandibles tridentate. 
®P. 1. Loph. Pini. 
inhabits Europe: is very rare in Britain. 
Earn. II. Xiphydriad*. Leach. 
Abdomen sessile : oviduct composed of two lamella*, which are serrated . 
mandibles more or less long, terminated by two strong teeth : wings 
with the three marginal cells complete : labrum obscure. 
Larva with scaly feet, or at least not membranaceous. 
Genus 423- CEPHUS. Latr., Fair., Panz., Leach. Sirex. Linn. 
Astatos. Klug. Trachelos. Jurine. 
Mandibles exserted, longer than wide: neck long: oviduct exserted : 
antenna inserted in the front between the eyes, gradually thicker ex- 
ternally. 
Sp. 1. Cephus pygmaus. Latr. 
inhabits flowers in fields and hedges. 
Genus 424. XIPHYDRIA. Latr., Fubr., Panz., Leach. Sip.ex. 
Linn. 
Mandibles exserted, longer than wide: neck long: oviduct exserted: 
antenna setaceous, inserted above the clypeus. 
®P- 1 • Xiph. Camelus. 
inhabits willow grounds. 
Fam. III. Uroceiud/e. Leach. 
Abdomen sessile: oviduct filiform, exserted, or inclosed in a groove be- 
neath the abdomen : mandibles short. 
Genus 425. ORYSSUS. Latr., Fair., Jurine, Lam., Klug, Pans., 
Lcuch. Sphex. Scopuli. 
Mandibles with their internal edge not dentated : maxillary palpi long 
and pendulous: antenna filiform, compressed, inserted under the an- 
terior margin of the clypeus : superior wings with one marginal cell, 
