104 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Metathorax not spiuecl at base. 

 With wings. 



Wings bare, -without cilia Trichosteresis Forster 



Wings pubescent, with cilia. 

 Eyes usually bare ; mesouotum not narrowed anteriorly. 



Lygocerus Forster 

 Eyes pubescent; mesonotum narrowed anteriorly. ..Megaspilus Westw. 

 Wingless. 



Maxillary palpi 5-jointed; labial 3-joiuted; thorax not much narrowed. 



Megaspilus Westw. 

 Maxillary palpi 4jointed; labial 2-jointed; thorax much narrowed. 



Eumegaspilus Ashm. 



2. Mesonotum with 2 impressed lines ; apterous Dichogmus Thorns. 



Mesouotum with 1 impressed line ; apterous. 



Eyes small ; ocelli wanting Lagynodes Forster 



Eyes large ; ocelli present ; winged Atritomus Forster 



Mesouotum without furrows; subapterous. 

 Eyes large, bare ; ocelli distinct Atritomus Forster 



MALES. 



1. Mesonotum without impressed lines 2 



Mesonotum with 3 impressed lines. 



Metathorax with a forked spine at base Habropelte Thoms. 



Metathorax without a forked spiue at base. 



Wings bare, without cilia Trichosteresis Ftirster 



Wings pubescent, with cilia. 



Antenna? dentate or ramose Lygocerus Forster 



Antenna} simple, filiform. 



Maxillary palpi 5-jointed; labial palpi 3-jointed Megaspilus Westw. 



Wingless. 



Maxillary palpi 4-jointed; labial palpi 2-jointed. ..Eumegaspilus Ashm. 

 Mesonotum with 1 impressed line (Atritomus). 



2. Antenme toothed or serrate Atritomus Forster 



Anteimifi with 5 long branches, a branch on each of the first five flagellar joints, 



Dendrocerus' Ratzb. 



HABROPELTE Thomson. 

 Qfv., 1858, p. 288. 

 Megaspilodes Ashm., Can. Ent., xx, p. 48 (1888). 

 (Type H. mialis Boh.) 



Head transverse, the face not greatly lengthened, occiput margined; 

 ocelli 3, triangularly arranged; eyes oval, hairy. 



Antennte inserted just above the clypeus, long, filiform, 11-joiuted in 

 both sexes, the scape scarcely as long as the first fiagellar joint, pedi- 

 cel very small, hardly longer than wide, the flagellar joints lengthened, 

 equal or very gradually subequal. 



' This genus is unknown to me, and in the preparation of this work was at first 

 overlooked. It was described and figured by Ratz. in Die Ichn. d. Forstins., Band 



3. p. 181 (1852), where a full description of the male, the only sex known, is given. 

 While apparently closely allied to Lygocenm, I believe it to be distinct. 



