76 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.68 



ANDRICUS FOLIOSUS, new species 



Female. — Dark red, legs and antennae yelloAvish, lines on meso- 

 scutum and posterior part of abdomen often infiiscated. Head as 

 broad as thorax, coriaceous, face slightly pubescent, cheeks not broad- 

 ened behind e3'es, interocular space .6 transfacial and area one and 

 four-tenths times as broad as high; malar space .54 eye, without 

 groove ; antennae 13-segmented ; lengths as (scape) 12 : 6 : 15 : 12 : 11 :- 

 10 : 9 : 9 : 8 : 8 : 7 : 7 : 14, not tapering toward tip. Pronotum Avith Avhite 

 pubescence. Mesoscutum coriaceous, with a few setigerous punctures, 

 parapsidal grooves narrow, deep, smooth, shining, percurrent ; anterior 

 and parallel lines smooth; median groove developed posteriorly and 

 continued forward as a percurrent line. Scutellum pubescent, coarsely 

 rugose, with two large, well-separated, smooth, transverse pits at 

 base. Carinae on propodeum slightly bent and inclosing a rugose 

 area as broad as high, spiracular areas pubescent. Mesopleura acicu- 

 late below, polished above. Wing pubescent and ciliate; veins yel- 

 lowish; second abscissa of radius arcuate; radial cell three times as 

 long as broad, areolet reaching one-sixth and cubitus one-half way to 

 basal, but both faint. Hind tarsus shorter than tibia; claws with 

 tooth. Abdomen nearly as long as head and thorax ; length to height 

 to width as 85 : 65 : 51 ; lengths of tergites along dorsal curvature as 

 44 : 15, the rest hidden or showing but slightly ; tip of ventral valves 

 projecting dorsally; hypopvgium long, pubescent; ventral spine 

 slender, five times as long as broad in side view ; second tergite with 

 pubescent patch on each side at base, its posterior margin nearly at 

 right angle to long axis of abdomen. Using width of head as a base, 

 the length of mesonotum ratio is 1.2, antenna 2.3, wing 3.4, ovipositor 

 3.0. Length, 2.0-2.6 mm. Average of 104 pinned specimens, 2.3 mm. 



Male. — Differs from female in having antennae 15-segmented, 

 lengths as 9:6:15:11:10:9:8:8:8:7:6:6:6:6:7, last two-thirds 

 taj^ering to tip, ratio 2.5. Abdomen shorter than head and thorax, 

 lengths of tergites as 42:15:8:4:2:6, last four not always visible. 

 Length 1.6-2.0 mm. Average of 22, 1.7 mm. 



Types.— Qui. Xo. 27212, U.S.N. M. Type female, allotype, 9 male 

 and 49 female paratypes. Paratypes at American Museum, Field, 

 Stanford, Harvard, and Philadelphia Academy. 



Host. — Quercus hicolor and inacrocarfa. 



Gall (fig. 17). — A fleshy green enlargement of the midrib or one 

 of lateral veins usually on basal third of leaf blade, usually only 

 one on a leaf. "When seen from below there is a bend in midrib at 

 this point and a small depressed spot. On upper side of leaf it 

 shows a rosette of leaf-like rudiments hiding the gall ; on the lower 

 a smaller rosette on the concave side of the bond. The gall contains 

 1-6 larval cavities and the larva is much elonjrated iilvc those in rose 



