510 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



Baryampus Foerster, Hymenopterologische Studien, vol. 2, p. 84, 1856. (Type, 



Baryscapus ventricolae Ashinead.) 

 Oomyzus Rondani, Bull. Agr. Conim. Parma, vol. 3, p. 140, 1870. (Type, 



Oomyzus gallcrucae Rondani.) 

 Tetrastichodes Ashmkad, Trans. Amer. Ent. Soc, vol. 14, p. 203, 1887. (Type, 



Tetrastichodes floridanus Ashmead.) 

 Ceranisus Ashmead (not Walker), Mem. Carnegie Mus., vol. 1, p. 349, 350, 1904. 

 Neotetrastichus Pekkins, Bull. Hawaiian Sugar Planters' Assoc. Exp. Stat, Ent. 



Ser., vol. 10, p. 14, 1912. (Type, Neotetrastichus mimus Perkins.) (New 



synonymy.) 

 Epitetrastichus Girault, Mem. Queensland Mus., vol. 2, p. 205, 1913. (Type, 



EpitetrasticJws speciosissimus Girault.) (New synonymy.) 

 Neomphaloidella Gikault, Trans. Roy. Soc. South Australia, vol. 37, p. 69, 1913. 



(Type, Neomphaloidella fasoiativeniris Girault.) (New synonymy.) 

 Neotetrastichodes GiRAur.T, Mem. Queensland Mus., vol. 2, p. 228, 1913. (Type, 



Neotetrastichodes flavus Girault.) (New synonymy.) 

 Epomphaloides Gieavi.t, Arch, fur Naturg., vol. 79A, No. 6, p. 49, 1913. (Type, 



Epomphalokles flavus Girault.) (New synonymy.) 

 Aprostoceroloides Giratjlt, Mem. Queensland Mus., vol. 2, p. 243, 1913. (Type, 



Aprostoceroloides speciosus Girault.) (New synonymy.) 

 Blattotetrastichus Gikatilt, Ent. News, vol. 28, p. 257, 1917. (Type, Entedon 



hagenowii Ratzeburg.) (New synonymy.) 



The following combination of characters will differentiate the mem- 

 bers of the genus Tetrastichus from all other members of the super- 

 family Chalcidoidea : 



Margin of clypeus with a pair of toothlike projections (fig. 17, a) ; antennae 

 never inserted at or immediately dorsad of clypeal margin ; maxillary and labial 

 palps each composed of one segment ; mandibles each with three teeth ; female 

 antenna with three funicle segments, male with four, club in both sexes com- 

 posed of three segments, terminal two often more or loss fused, club always 

 with a minute terminal style; eyes with sparse, short hairs; pronotum narrow, 

 transverse (figs. 18, 19) ; front and middle tibiae slender; all tarsi with four 

 segments; front wing with a break where Rs diverges from the stem of R, 

 submarginal vein of front wing with from one to seven dorsal bristles ; marginal 

 vein always longer than stigmal vein, postmarginal vein wanting, no trace re- 

 maining of vein M; axillae produced anteriorly far in advance of tegulae; 

 mesoscutellum with two longitudinal, dorsal grooves (fig. 18) ; hindwing with 

 three hamuli (fig. 20, f) ; abdomen often with a rudimentary petiole (fig. 21, ft) ; 

 but never distinctly petiolate; ovipositor not markedly exserted (fig. 21, g-i). 



KEY TO SPECIES 



1. Ovipositor sheaths short, thickened, and somewhat flattened (fig. 21, g) 2 



Ovipositor sheaths elongate, more slender, as in fig. 21, h, i 3 



2. Gaster nearly circular in outline, ovipositor sheaths densely covered with 



Short, stout setae (fig. 21, g) chrysopae (Crawford) (p. 525) 



Gaster fully twice as long as broad, sheaths with only three or four 

 weak setae thripophonus Waterston (p. 525) 



3. Gaster as long as thorax ; body very dark brown or black, noniridescent ; sub- 



marginal vein of forewing with one dorsal bristle; mesopraescutum with 

 one row of bristles at each lateral margin, this row consisting of only three 



