NORTH AMERICAN TETRASTICHUS — BURKS 579 



lateral margin ; submarginal vein of forewing with three or four dorsal 

 bristles ; apex of hindwing blunt, width of fringe at posterior margin 

 one-seventh width of wing at hamuli. Surface of propodeum strongly 

 shagreened; mesal length of propodeum one-third length of meso- 

 scutellum; median, paraspiracular, and oblique carinae usually pres- 

 ent (fig. 21, d) , oblique carinae sometimes obscure ; propodeal spiracles 

 almost contiguous with anterior margin, their diameters equal to one- 

 half median length of propodeum; gaster one and one-half times as 

 long as thorax. 



Male. — Length, 1.5-2.0 mm. Scape bearing darkened carina near 

 apex, first f unicle segment one-third longer than pedicel ; second, third, 

 and fourth segments equal in length and each slightly shorter than 

 first; f unicle segments subquadrate, without conspicuously long 

 bristles, club short, only as long as pedicel and first funicle segment 

 combined ; gaster as long as thorax. 



Type locality. — Jacksonville, Fla. 



Types. — U.S.N.M. No. 2488. ( Male type specimens missing. ) 



Hosts. — Oak galls, Amphibolips cinereae ( Ashmead) , Amphibolips 

 racemaria (Ashmead), Amphibolips prunus (Walsh), Callirhytis 

 pomiformis (Bassett), Disholcaspis mamma (Walsh), Andricus 

 lasius Ashmead, Andncus flocci (Walsh), Neuroterus batatus (Fitch). 



Distribution. — Apparently to be found over most of the United 

 States. 



TETRASTICHUS CORMUS, new species 

 Figures 16, /; 17, g; 21, c, h 



Head and thorax minutely shagreened ; dark iridescent blue-green ; 

 usually dorsal side of entire antenna, coxae, basal four-fifths of femora, 

 central parts of middle and hind tibiae, apical segment of each tarsus, 

 and gaster dull brown ; ventral side of antennae, apices of femora, fore 

 tibiae, apices and bases of middle and hind tibiae, and basal segments 

 of tarsi light yellow ; entire antennal flagellum may be yellow rather 

 than brown dorsally. 



Female. — Length, 2.0-2.5 mm. Antennae inserted slightly ventrad 

 of level of ventral margins of compound eyes ; apex of scape reaching 

 level of ventral margin of anterior ocellus ; pedicel and first funicle 

 segment equal in length, second segment one-fifth longer, third equal 

 to first; club twice as long as third segment; malar suture arcuate, 

 length of malar space three-fourths as great as height of compound 

 eye; length of postocellar line twice as great as ocellocular. Meso- 

 praescutum slightly wider than long and bearing two rows of bristles 

 at each lateral margin; submarginal vein of forewing with three or 

 four dorsal bristles; apex of hindwing blunt, fringe at posterior mar- 

 gin one-sixth as wide as wing at hamuli ; entire thoracic pleuron sha- 

 greened. Surface of propodeum shagreened, strong mesal and para- 



