ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 515 



^neous black, the mesoiiotuin and the scutellum metallic, delicately shagreened ; two rows of punc- 

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

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



3. Blue-black ; the mesonotum microscopically shagreened ; 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 shagreened ; withovt a row of punctures along the parapsidal fur. 

 rows ; scape and legs, except coxce, honey yellow ; abdomen, seen from above, rounded, shorter tlian 

 the thorax T incongruus, sp. nov. 



Tetrastichus albitarsis, sp. nov. 



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

 leneous, the base of tlie 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 shagreened. Wings hj^aline, the veins brown. Abdomen conic-ovate, 

 little longer than the head and thorax united, smooth and sliining, 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. vEneous black, the mesonotum and scutellum with 

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

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

 pubescent, the first joint of the funicle is the largest, more than 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 i)unctate and has a distinct 

 median carina. The wings are hyaline, the veins yellowish. The al)domen is conic- 

 ovate, smooth impunctate and ab(nit the length of the thorax, the linst body seg- 

 ment being the longest. 



Brazil : (Jhapada, in April. One female specimen. 



Tetrastichus brasiliensis, .sp. nov. 

 (Plate XXXIX , Fig. 2.) 



Female. — Length 2 mm. Dark l)lue black, nearly l)lack, with a faint leneous 

 tinge, the head except in the scrobes with thimble-like [)unctures, the thorax above 

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

 along the parapsidal furrows ; scape and legs, except coxa3, honey yellow, the femora 



