MONOGKAril OF THE NORTH AMERICAN PROCTOTRYPID.E. 103 



alHloiiieii is quite distinct. The nou-lobod liiiul wings, venati<m, dif- 

 fcriMit antenna', and shape of mandibles, at once separate the species 

 in this group from the Bethylime, Embolemina', and the Dryiniuie; 

 whih' from the only two groups that follow, with which they woiild 

 likely be confused — the Scelionime and the Platygasterime, which 

 like themselves have non-lobed hind wings ami the antenme inserted 

 close to the mouth — they may be readily distinguished by the widely 

 different antennsB, the shape of the head, venation, and uou-carinated 

 abdomen. 



If we accept the published records as accurate, this group has great 

 diversity of habits. 



Katzeburg has recorded Megaspihis sp. from a bombycid, a syrphid, 

 two (;ecidomyiids, a Chermefi, a scolytid and a tortricid ; Ceraphron species 

 from a tineid, a Tomicus, a Curculio and a Brachonyx; and a Lygocerus 

 from a cynipid. Unquestionably, so far as the hosts are concerned, 

 some of these records are inaccurate. The records in this country and 

 others published abroad, show the group attacks almost exclusively 

 the homopterous i\imi\y Aphididxv, and the dipterous family GeddomyiUhe. 

 All reared by me, as well as those reared by Dr. Riley, except in a single 

 instance (the rearing of a Lygocerus, by Dr. Riley, from a tortricid, 

 Sarrothripa rawayana, which is of questionable accuracy) have been 

 fronj Aphids and Cecidomyiids. It is not improbable, therefore, that a 

 parasitized Aphid was on the same leaf when the Lepidopteron Avas 

 placed in the breeding jar. 



Some such explanation may also account for the rearing of these in- 

 sects by Ratzeburg from Lepidoptera, and his rearings from Coleoptera 

 may be accounted for by the supposition that they were accompanied 

 by inquilinous Dipterous larvse. 



To accept without question such diversity of habits in the genera of 

 this group it seems to me would be uuscientitic. 



The group seems to divide naturally into two tribes distinguished 

 as follows : 



Margiual vein stigmated; antenntB, with the same number of joints in both sexes, 

 U-jointed Tribe I. — Megaspilini 



Marginal vein linear, never stigmated; antennae with a less number of joints in the 

 females than in the males; males with 10- or 11-jointed antennae; females 9- or 

 10-jointed Tribe II. — Cekaphronini 



Tribe I. — Megaspilini. 



The genera in this tribe are not numerous and may be tabulated as 

 follows : 



lABLE OF GENERA. 



"" " ■_ -_-™_„ ,, FEMALES. 



1. Mesonotum without or with 1 or 2 impressed lines 2 



Mesonotum with 3 impressed lines. — - 



Metathorax with a forked spine at base Habbopeltk Thoms. 



