4 HYMENOPTERA OF AMERICA. [PART I. 



Gen. TRIJMERIA Sauss. 1 



Antennae clubbed, lengthened ; the last articles very indistinct. 

 Lip not extensile, tongue shaped, bifid. Labial palpi composed 

 of three articles; maxillary apparently of none. Mandibles 

 tolerably sharp. Abdominal segments constricted at their base ; 

 not retractile. 



1. T. americana Sauss. 



Erinnys americana Sauss. Ann. Soc. Ent. Fr. 3d ser. I, Bull, xx, 1853. — 

 Trimeria americana Sauss. Vespides, III, 1854, 81, PI. iv, fig. 2, £. 



Hab. Brazil. 



Gen. MASARIS Fab. 

 Antennae of % long, of 9 short, composed of twelve articles, 

 of which the five last are soldered into a single bare mass 

 (leaving but eight articles apparent). Articles 4-7 long in the 

 males, short in the females, and incompletely soldered; the 

 terminal mass (8th article) forming an oval club in the male, 

 variable among the females. Lip extensile; the tongue bifid, 

 inclosed in a contractile sheath, in the form of a lamina, placed 

 edgewise: labial palpi short. 3 Jaws short; maxillary palpi 

 rudimentary. Mandibles short, arcuate, bidentate. Clypeus 

 notched like the arc of a circle. Metathorax flattened behind 

 (bispinose). Abdomen flattened beneath, the segments contracted 

 at the base, the third and following not retractile into the second ; 

 the abdomen equally wide and rounded at tip in the 9 ; lengthened 

 in the %, attenuated toward the end, bifid at the anus, and seg- 

 ments 2-3 armed beneath with a salient process. 



1 I at first named this genus Erinnys in commemoration of a discussion 

 upon the antennae of Masaris which for a long time occupied the Entomo- 

 logical Society of France (see Inc. cit.) ; but finding this name already 

 employed, I changed it to Trimeria, which seems scarcely better, as there 

 are already two genera Trimera. Nevertheless I think it better to retain 

 the new name, since it is not identical with the last. 



2 See for the composition of the lip, Sauss. Vespides, III, 23, and 

 Anualvs des Sciences Naturelles, 1857, VII. 



