NORTH AMERICAN TETRAST'ICHUS BURKS 533 



Iridescent blue-green ; sometimes scape and pedicel of antennae, 

 anterior trochanters usually, apices of femora, tibiae, and basal seg- 

 ments of tarsi white or light yellow; abdomen slightly lighter at 

 base. 



Female. — Length, 1.8-2.0 mm. Antennae inserted at level of ventral 

 margins of compound eyes: apex of scape reaching level of vertex; 

 all funicle segments equal in length and each slightly longer than 

 pedicel; club as long as two funicle segments; malar space two-thirds 

 height of compound eye; postocellar line one and one-third times as 

 long as ocellocular. Mesopraescutum wider than long and bearing one 

 row of bristles at each lateral margin; submarginal vein of forewing 

 with one dorsal bristle; marginal vein three times as long as stigmal ; 

 apex of hindwing blunt, width of fringe at posterior margin one-sixth 

 width of wing at hamuli. Surface of propodeum shagreened, lateral 

 carinae present; median length of propodeum one-half length of 

 mesoscutelluin ; spiracles not quite touching anterior margin of pro- 

 podeum ; gaster as long as thorax, apices of sheaths not reaching apex 

 of abdomen. 



Male. — Unknown and probably does not exist ; this species has been 

 reared many times and has always been found to be parthenogenetic. 



Type locality. — Amherst, Mass. 



Types.—TJ.S.'NM. No. 12G76. 



Host. — The asparagus beetle, CHowris asparagi (Linnaeus). 



Distribution. — Commonly distributed in eastern and central United 

 States and Canada, wherever asparagus is grown. Occurs also in 

 Europe. 



TETRASTICHUS FLORA (Girault), new combination 



Figure IS, e 



Aprostocetus flora Giraut,t, New chalcid flies, p. 3, 1017. 



Epitetrastichns tricolor Girault, Descriptiones stellarum novarum, p. 9, 1917 

 [not Tetrastichits tricolor Ashmead] (New synonymy.) 



Varying from yellow and brown to almost entirely black; antennae 

 usually, head, except areas surrounding ocelli and on occiput, venter 

 of thorax, metacoxae, and basal half to two-thirds of abdomen yel- 

 low: femora, tibiae, and tarsi white; male mostly brown. 



Female. — Length, 1.25-1.4 mm. Antennae inserted at level of ven- 

 tral margins of compound eyes; apex of scape flattened, reaching 

 level of anterior ocellus, first funicle segment three-quarters as long 

 as pedicel, all funicle segments equal in length, club one and one-half 

 times as long as pedicel ; length of malar space two-thirds height of 

 compound eye; postocellar line equal in length to ocellocular. Each 

 lateral angle of pronotum produced in a minute point (fig. 18, e) ; 

 mesopraescutum as wide as long and bearing one pair of bristles, 



