36 GENERA OF HYMENOPTERA. 



Concerning our genera and sjwcies of this interesting family, con- 

 siderable has been written by Osten Sacken, Walsh, Bassett and 

 Aslnnead. a list of whose publicatiitns will be given, in the liiblio- 

 grajjlucal List, further on. 



Family EVANIIDiE. 



This family is easily distinguished l)y the abdomen being attached 

 til the disk iir near the base of tlic mctatliorax, and not at the apex 

 aij is the case in the other families. The genera are readily separated 

 by the characters given in the following table. The abdomen is 

 petiolate and more or less compressed in all the genera ; it is long, 

 sickle-shaped in Fmnis, subelliptic, when viewed laterally, in Aul(tcui<, 

 short, hatchet-shaped in Kran'm, and small, ovate in Hyptia, nnidi 

 (•oin|iic»(d and attached to the thorax by a rather long slender 

 petiole in the last two genera. 



The genus Pammef/ischia Prov. (which the writer has not seen) 



seems to differ from Aulacus chiefly in the formation of the ])()sterior 



coxse. 



Table of Genera. 



Anterior wiiifjs with iwu it'cuiicnt iicrvures; iilxloiucu iittachcd to the pyra- 

 niidially elevated middle of nietathorax, almost elliptical in shape, sub- 

 compressed, about as lon<j as head and thorax, ovipositor long ; three 

 submargiiial cells, the dividing nervure between the second and third some- 

 times more or less incomplete, three complete discoidal cells ; mesothorax 

 nuich elevated anteriorly, coarsely transversely rugose and usually promi- 

 nently tril(»l)cd ; head not narrowed behind the eyes which do not attain 

 base of mandibles; antennae inserted low down near base of clypeus, about 

 on a line with lower margin of the rounded eyes, scape short, dilated ; pos- 

 terior legs long and slender. — Aulacinae. 



Posterior cox£e as usual ; first submarginal cell receiving the first recurrent 

 nervure at or near the tip Aula<'ii«< Jur. 



I'ijsterior coxse swollen, much elongated and i)rolonged within lieyoiid inser- 

 tion of the tiochanters ; first submarginal cell receiving the first recurrent 



nervure t'lwards the middle I»aiiiiiiesis<'liia I'mv. 



Anterior wings with only one recurrent nervure or none; anteniue iiiserUil high 

 u]i about opposite the middle of the oblong eyes, — Evaniinae. 



Abdomen attached to base of metathorax close to scutellum, long, sickle- 

 shaped, much longer than bead ami thorax, snbclavate, gradually increas- 

 ing in wiillh from its insertion, ovipositor long; anti-rior wings with a long 

 marginal cell whicli almost reaches the apex of the wing, two submarginal 

 cells, first unusually large, second ojien to ajiical margin, first discoidal cell 

 very small and narnnv, secoml diseoidal (»i)en beneath by a deflection of 

 the anal nervure, third discoidal ojien to ajiieal margin of the wing; head 

 elnngate, depressed, extended and more or less narrowed behind the eyes 

 whicii attain the base of mandibles; scape short; mesothorax convex, 



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