314 AMERICAN IIYMENOI'TKi: A. 



A few extremely minute hairs on the sides of this segment close to the anterior 

 margin. Legs lighl brown at the joints. Wings large, veins dark brown, areo- 

 let wanting, radial aria open, t lull .12 to .15 long I base to apes . .10 to .12 broad. 

 Base broad, apex cone shaped. Base with the cicatrix of a true acorn. 



Aiiriricu* pii Icliell n>» n. sp. 



Gall-fly. A female found ovipositing in the huds of Quercus prinoides. Black 

 ami glistening. Eead small. Antennae fourteen jointed, slender, dark reddish 

 brown, first joint medium size, globose, second very small, the following short 

 and of uniform length. Thorax ovale, punctate, sparsely hairy, hairs fine. 

 Parapsides large, closely converging, both on the collare and the scutellum. 

 Scutellum small: fovse rather widely separated, small and shining. Abdomen 

 short: .irst segment long, four-fifths of the entire length, black and smooth. 

 Legs clear reddish brown. Wings large, veins pale brown, very slender. Radial 

 area open. Areolet large and hounded by veins of uniform size. Cubitus indis- 

 dinct and reaching half way to the first transverse. Body .10, antennas .09, 

 wings .11. 



llldrictlM |> i p< i <> i cl <■> n. sp. 



Galls from one-eighth to three-eighths of an inch in diameter, in 

 dense clusters along the mid-vein of full grown red oak leaves 

 Quercus rubra). They are found only on the largest leaves of the 

 thriftiest shoots of young oaks. The clusters contain from one or 

 two dozen galls up to a hundred or more, and extend along the vein 

 two, three or even four inches. The vein is considerably enlarged, 

 and is often split by the crowding of the galls as they increase in 

 size. The blade of the leaf is often torn by the same force and 

 the galls appear on both surfaces. When on the tree they are 

 covered with a dense, coarse pubescence which is, in color, a dusky 

 drab, or when exposed to the sun a brownish red. They are round 

 except a very slight elongation at the point of attachment to the 

 leaf. After falling to the ground they soon turn black, and after 

 losing their pubescence they resemble quite closely small black pep 

 per corns. At this time they are a solid mass of vegetable cells 

 with a minute jelly-like center, which is the undeveloped larva. 

 The growing larva devours the gall till at maturity nothing remains 

 but a thin shell. 



My o-;dls were collected in October and were kept until late the 

 next Summer under conditions as nearly normal as possible. A.S 

 the tlies seemed mature in August I placed the galls in dry boxes, 

 expecting the insects would soon appear. 



During October and November I removed from the galls some 

 two hundred insects. They were somewhat torpid but seemingly 

 mature. These were alive in January of the next year, and those 



