20 HALIDAY ON 



another instance of that constant loss and reparation of sub- 

 stance which is incident to all organized beings ; proclaim 

 the existence of a general uniformity of plan, with which the 

 widest differences, the greatest discrepancies, are not only 

 compatible, but are essential to perfect harmony, are the surest 

 and safest guides to natural arrangement, and serve, like the 

 key- stones of arches, to unite objects before devoid of con- 

 tinuity; proclaim finally the greatness of Him whose will 

 shapes the whole into perfection. 



Art. III. — Essay on Parasitic Hymenoptera. 

 By A. H. Haliday, M. A. 



{Continued from Vol. II., <page 468). 



Of the Ichneumones Adsciti. 



Gen. VI. Leiophron. {Appendix.) 



Subgen. I. — PYGOSTOLUs^ 



Palpi labiales ^-articulati, articulo penultimo minutissimo : 

 abdomen subsessile; segmento 1™°. perbrevi ; ano vertica- 

 liter Jisso : aculeus linearis dejtexus : alarum anticarum 

 areola radialis apicem alee attingens; antica disci remota. 



Leiophron (partim) N. ab Ess. Act. Acad. IX. 303. 



Gen. VI. 

 Monogr. 43. Gen. VII. 



fSp. 1. L. P. falcatus. Fem. Testaceus, macula verticis, 

 metathorace, abdominis basi et alarum stigmate fuscis. 



(Long. vix. 2 lin.) 



Leiophron falcatus. A"^. ab Ess. Monogr. 44. Sp. I . 



Ab L. stictico differre videtur statura plus duplo minore, alarum 

 stigmate fusco, segmente 1™". abdominis ante tubercula nonnihil 

 producto : siletur etiam punctum fuscum marginis antici thoracis : 

 reliqua ad amussim conveniunt. 



Habitat Gerraaniam. 



Adnot. — Leiophron clavipes N. ab Ess. Monogr. 45. Sp. 2, nobis 

 pariter invisus ad proprium subgenus relegandus videtur. 



• Pygostolus, a irv^ et o-TeA\ui, propter fissuram ani. 



