ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 515 



^neous black, the mesonotum and the scutellum metallic, delicately shagreeued ; two rows of punc- 

 tures along the parapsidal sutures ; legs, except the coxae, yellowish, the femora dusky basally ; abdo- 

 men conic-ovate, not longer than the thorax T. chapadse, sp. nov. 



3. Blue-black ; the mesonotum microscopically shagreeued ; a single row of punctures along the parapsidal 

 furrows ; legs, except coxae, honey-yellow, the femora dusky medially and basally ; abdomen coni- 

 cally pointed, longer than the head and thorax united T. brasiliensis, sp. nov. 



Black ; mesonotum microscopically shagreeued ; witJiout a row of punctures along the parapsidal fur. 

 rows ; scape and legs, except coxae, honey yellow ; abdomen, seen from above, rounded, shorter than 

 the thorax T incongruus, sp. nov. 



Tetrastichus albitaesis, sp. nov. 



Female. — Length 1.5 mm. Wholly dark blue, except the parapsides which are 

 seneous, the base of the antennal scape which is honey yellow, and the tarsi 

 which are yellowish-white except the last joint. The insect is smooth impunctate, 

 except the head which has a few minute punctures on the face; otherwise I can 

 detect no distinct sculpture, although under a very high power the thorax above 

 appears feebly shagreeued. Wings hyaline, the veins brown. Abdomen conic-ovate, 

 little longer than the head and thorax united, smooth and shining, depressed above, 

 subcarinate beneath towards base. The flagellum is broken off at the pedicel and 

 cannot be described in detail. 



Brazil : Rio de Janeiro, in August. One female specimen. 



Tetrastichus chapad^, sp. nov. 



Female. — Length 1.8 mm. ^neous black, the mesonotum and scutellum with 

 a metallic greenish tinge, shagreeued, the head punctate in front ; scape, pedicel and 

 legs, except coxae, honey-yellow, the femora faintly dusky basally ; flagellum brown, 

 pubescent, the first joint of the funicle is the largest, more thai;i twice longer than 

 thick. The middle lobe of the mesonotum has two rows of punctures on each 

 side, along the parapsidal furrows. The metanotum is punctate and has a distinct 

 median carina. The wings are hyaline, the veins yellowish. The abdomen is conic- 

 ovate, smooth impunctate and about the length of the thorax, the first body seg- 

 ment being the longest. 



Brazil : Ohapada, in April. One female specimen. 



Tetrastichus brasiliensis, sp. nov. 



(Plate XXXIX., Fig. 2.) 



Female. — Length 2 ram. Dark blue black, nearly black, with a faint seneous 



tinge, the head except in the scrobes with thimble-like punctures, the thorax above 



shagreeued, the middle lobe of the mesonotum with a single row of punctures 



along the parapsidal furrows ; scape and legs, except coxse, honey j^ellow, the femora 



