CLASS V. INSECTA. 267 



Length of the l)ocly 5 — 5| hnes, expansion of the wings 10 — 11 hnes. 

 Inhabits Germany and England : in the latter it is very rare, and has 

 only been fonnd near Bristol. 



Genus 421. LYDA. Fubr., SpiuoL, Klug., Leach. Pampiiilius. 



Latr., Leach, Edinb. Enc^cl. vol. ix. 141. Cephaleia. Jurinc 



Tibicc, the four posterior furnished on the inside with a single spine 



near the uiiddle and a double one beneath. 

 Laifa with no spurious feet. 

 Lyda-. King. 

 Sp. 1. Li/da Betulie. 2. L^du eiythrocephala, SfC, 



Genus 422. LOPIIYRUS. Latr., Leach. Pteronus. Jurine. Hy- 

 LOTOMA. Fubr. Tenthre^do. Linn., De Gecr, Oth\, Lam., 

 Panz. 

 Antenna pennated in the males; serrated in the females: superior wings 

 with one martrinal and three sid^mar^inal cells; /«0H(/t6/ts tridentate. 

 Sp. 1. Lup/i. Fini. 

 Inhai)its Europe : is very rare in Britain. 



Fam. II. XiPHYDRiAD.E. I^each. 



Abdomen sessile : oviduct composed of two lamella", which are serrated : 

 )nandibles more or less long, terminated by two strong teeth : wings 

 with the three marginal cells complete : labrum obscure. 



LurviB with scaly feet, or at least not membranaceous. 



Genus 423. CEPIIUS. Latr., Fabr., Panz., Leach. Sirex. Linn. 

 AsTATus. Klug. Trachelus. Jurine. 

 Mandibles oxserted, longer than wide : neck long : oviduct exserted : 

 anten/ie inserted in the front between the eyes, gradually thicker ex- 

 tern. dly. 

 Sp. 1. Cephas pygmaus. Latr. 

 Inhabii-. (lowers in tields and hedges. 



Genus 424. XIPIIYDRIA. Latr., Fabr., Panz., Leach. Sieex. 



Una. 

 ^landiblcs exserted, longer than wide: neck long: oviduct exserted: 



antennec. setaceous, inserted above the clypeus. 

 Sp. 1. Xiph. Camelus. 

 Inhabils willow grounds. 



lam. III. Urocerid.e. Leach. 



Abdomen sessile: oviduct filiform, exserted, or inclosed in a groove be- 

 neat! i the abdomen : mandibles short. 



Genus 42.5. ORYSSUS. Latr., Fabr., Jurine, Lam., Klug, Panz., 

 Leach. Sphex. Scopoli. 

 Mandibles with their internal edge not dentated : maxillary palpi long 

 and pendulous: untennte filiform, compressed, inserted under the an- 

 terior margin of the clypeus : superior wings with one marginal cell, 



