Nf'i20C. ICHNF.rMON FLIES— ASILMEM). 133 



subtairiiiy XIII. icii:isrEixj'ri]sr.zh:;. 



1862. Iclmeutoidiv, Family 20, Forster, Verb. <1. luitiirh. \vr. \ir. Rheiiil., XIX, 



pp. 229 and 256. 

 1885. Ichneutkhx Marsh.all, Trans. Ent. Soc. Lond., p. 10. 



1887. IchneutiuH', Snbfamily, Cresson, Syn. Hyni. North America, p. 61. 



1888. Iclnieutida', Tribe XVII, M.vrshali., Species des Hym. den Braconides, I, 



p. 66. 

 1000. Iclnteutlna-, 8ul)faniily XIII, Ashme.M), Smith's Insects ol" New .lersey, 

 p. 594. 



With this g-roup begins a series of subfamilies quite distiiu-t from 

 the preceding- and closest allied to those which are to follow, or Wes- 

 maePs ClycloHtmni. 



The IcJineutincB and the Opihue closelj^ resemble each other and 

 agree fairly well in the venation of the hind wings; the former is, 

 however, easily separated from the latter by the venation of the front 

 wings, the marginal cell ]»eing very short, while the anal cell is divided 

 by a transverse nervure or a stump of a nervure. 



The species belonging to this group whose parasitism is known all 

 attack the larva? of various saw-tlies {Tenthredliioldcd). 



Only three genera fall inty this group, all foiuid in our fauna. 



T.\BLE OK genera. 



Hind wings with the radius absent 2 



Hind wings with the radius present 3 



First abscissa of the radius mucli shorter than the .second, the latter being much 

 longer than the first transverse cubitus; first joint of the flagellum longer 

 than the scape; maxillary i)alpi 5-jointed, the end penultimate joints sub- 

 equal; ocelli normal ( 1021 ) Ichneutes Nees. 



2. First abscissa of the radius as long as the second, the second shorler than the 

 first transverse cubitus; first joint of the flagellum not longer than the scape; 

 maxillary palpi 4-jointed, the last joint nmch longer than tlie preceding; 



ocelli normal ( 1022 ) Ichneutidea Ashmead, new genus. 



(Type, Ichneutcs abdominalis Cresson. ) 



First abscissa of the radius either nnich shorter or longer than the second, the 



second usually a little shorter than the first transverse cubitus; maxillary 



palpi 5-jointed; ocelli abnormal, the frons being short and the front ocellus 



placed far anteriorly between the antenna' (1023) Proterops Wesmael. 



Sulofamily XIV. OPII^STJK. 



1862. Cjpioidie, Family 24, Forster, Verb. d. naturh. Vt'i. ])r. Klusinl., XIX, p|). 



229 and 258. ' 

 1885. Opiides M.veshall, Trans. Ent. Soc.Lond., i^. 11. 



1887. Ojn'msc, Subfamily, Cresson, Syn. Hym. North America, pp. 54 and 61. 



1888. Opiidie, Tribe XXII, Marshall, Species des Hym. des Braconides, I, ji. 67. 

 1900. Opiinsc, Subfamily XIV, Ash.mead, Snuth's Insects of New Jersey, p. 594. 



This tribe is composed of a great number of miruite species, para- 

 sitic on Dipterous larva>, and i)articularly on leaf-mining species. It 

 is separated from the IcJineiitftia' ])\ the marginal cell being long, never 



