384 Mr. F. Walker's Notes on Chalcidltes, 



Female. — Deep black. Head smooth, a little narrower than 

 the thorax. Antennae black ; scape tawny. Thorax gibbous, 

 largely punctured ; scutum transversely striated ; sutures of the 

 parapsides indistinct ; scutellum longitudinally striated, ending in 

 two slightly curved but not converging spines, which extend to 

 the tip of the abdomen. Petiole linear, nearly half the length of 

 the abdomen. Abdomen fusiform, smooth, deep, compressed, a 

 little shorter and very much narrower than the thorax. Legs 

 pale yellow ; coxee black. Wings limpid ; veins brown ; ulna 

 hardly more than half the length of the humerus ; radius obsolete. 



Length of the body 2| lines ; of the wings 5 lines. 



Brazil. In the British Museum. 



Thoracantha surgens. 



Mas. — Atra ; caput aeneo-nigrum ; antennae nigrae, ramis longis 



sequalibus pubescentibus ; thorax gibbus ; scutum transverse 



striatum; parapsidum suturse indistinctae; scutellum sub- 



rugulosum, sulco transverso, spinis duabus arcuatis striatis 



abdominis apicem superantibus ; petiolus gracilis, abdominis 



longitudine ; abdomen fusiforme, compressum, thoracis di- 



midio non longius ; pedes pallide flavi ; alee fuscescente 



cinereae. 



Male. — Deep black. Head aeneous-black, a little broader than 



the thorax, very minutely punctured in front. Antennae black, 



with long pubescent branches of equal length. Thorax gibbous. 



Scutum transversely striated ; parapsides almost smooth, with 



slight sutures ; scutellum somewhat rugulose, with a transverse 



furrow, ending in two curved, converging, striated spines, which 



extend beyond the tip of the abdomen. Petiole linear, slender, 



as long as the abdomen. Abdomen fusiform, smooth, compressed, 



not more than half of the length or of the breadth of the thorax. 



Legs pale yellow ; coxae black. Wings brownish-cinereous ; 



veins black ; ulna shorter than the humerus; radius obsolete. 



Length of the body 2 lines ; of the wings 4 lines. 



Santarem. Discovered by Mr. Bates. In the British Museum. 



Thoracantha apta. 

 Mas. — Atra, crassa, brevissima ; caput parvum, sub-lseve ; an- 

 tennae nigras, capitis latitudine non longiores, ramis longis 

 pubescentibus ; thorax gibbus ; scutum transverse striatum ; 

 scutellum striatum, spinis duabus rectis laiis compressis ab- 

 dominis apicem fere attingentibus ; petiolus robustus, abdo- 

 minis dimidio non longior; abdomen fusiforme, compressum, 



