NORTH AMERICAN TETRASTICHUS — BURKS 507 



Foerster stated that he considered Walker to have been correct in 

 combining Aprostocetus and Tetrastichus but that in the future if 

 the species with an elongate ovipositor were segregated generically 

 they should be placed under the name Aprostocetus, with Lonchen- 

 tedon Ratzeburg as a generic synonym. 



When Walker published his final classification of the chalcid-flies, 8 

 he treated the genera of the family Tetrastichidae briefly, but his 

 classification differs very little from Foerster's. Walker, even at that 

 comparatively late date, continued to regard Aprostocetus as a syn- 

 onym of Tetrastichus? although observance of the right of priority 

 had become quite general by that time. 



In 1878, Thomson 10 published keys and descriptions for the Scan- 

 dinavian species of Tetrastichus, listed Aprostocetus Westwood and 

 Lonchented on and Geniocerus Ratzeburg as generic synonyms, and 

 transferred a number of species from Eulophus and Entedon to 

 Tetrastichus. 



Howard, a few years later, ke}^ed out the genera of the chalcids but 

 did not modify the concept of the genus Tetrastichus prevailing in 

 the works of European authors. 11 When Ashrnead published his clas- 

 sification of the suprageneric categories of his superfamily Chalci- 

 doidea, 12 he considered Foerster's family Tetrastichoidae (or Walker's 

 Tetrastichidae) as the subfamily Tetrastichinae of the Eulophidae. 

 In his classification of the chalcid-flies down to genera, Ashrnead in- 

 cluded 13 genera in the Tetrastichinae. 13 He considered Tetrastichus 

 and Aprostocetus to be distinct, and listed Geniocerus and Trichoceras 

 Ratzeburg as synonyms of the former. He cited Eulophus miser Nees 

 as the genotype of Tetrastichus, apparently because of the fact that 

 Dalla Torre 14 had listed Cirrospilus attains as a synonym of Eulophus 

 miser. 



Ashrnead grouped Melittobia Westwood, Tetrastich odes Ashrnead, 

 Trichaporus Foerster, Hyperteles Foerster, Gyrolasia Foerster, Syn- 

 tomosphyrum Foerster, Geranisvs Walker, Baryscapus Foerster, 

 Aprostocetus Westwood, Crataepus Foerster, and Pentastichus Ash- 

 mead with Tetrastichus in the tribe Tetrastiehini and, making a tribe 

 Ceratoneurini for the genus Ceratoneura Ashrnead, placed these two 

 tribes in the subfamily Tetrastichinae. Five years later, Schmiede- 

 knecht 15 used Ashmead's classification almost without change but 

 pointed out that the genus Oomyzus Rondani is a synonym of Tetra- 

 stichus. 



8 Notes on Chalcidiae, 129 pp. in 7 pts., London, 1871-1872. 

 • Loc. cit., p. 113. 



10 Hymenoptera Scandinaviae, vol. 5, p. 278, 1878. 



11 Ent. Amer., vol. 2, p. 100, 18S6. 



u Proc. Ent. Soc. Washington, vol. 4, p. 249, 1897. 

 13 Mem. Carnegie Mus., vol. 1, p. 348, 1904. 

 " Catalogus hymenopterorum, vol. 5, p. 18, 1898. 

 15 Genera insectorum, fasc. 97, p. 471, 1909. 



