104 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Metathorax not spined at base. 

 With wings. 



Wings bare, without cilia Tkichosteresis Forater 



Wings pubescent, with cilia. 

 Eyes usually bare ; mesonotum not narrowed anteriorly. 



Lygocerus Forster 

 Eyes pubescent; mesouotum narrowed anteriorly. ..Meuaspilus Westw. 

 Wingless. 



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



Megaspilus Westw. 

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



EuMEGASPiLUS Ashm. 



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



Mesonotum with 1 impressed line ; apterous. 



Eyes small; ocelli wanting Lagynodes Forster 



Eyes large; ocelli present ; winged Atritomus Forister 



Mesonotum without furrows ; subapterons. 

 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 spine at base. 



Wings bare, without cilia Trichosteresis Forster 



Wings pubescent, with cilia. 



AutennsB dentate or ramose Lygocerus Forster 



Antennae 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. Antennae toothed or serrate Atritomus Forster 



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



Dendrocerus' Katzb. 



HABROPELTE Thomson. 

 6fv., 1858, p. 288. 

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



(Type H. tibialis Boh.) 



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

 ocelli 3, triangularly arranged; eyes oval, hairy. 



Antennae inserted just above the clypeus, long, filiform, 11-jointed in 

 both sexes, the scape scarcely as lon«;; as the first flagellar 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 Lygocerus, I believe it to be distinct. 



