4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



tinguished from all the other species of Amphibolips by having the 

 base of the second tergite aciculate, while in all the others it is 

 smooth. They are robust species, with the hind margin of second 

 tergite and exposed parts of the rest confluently punctate. 



KEY TO DESCRIBED ACOUN-GALL-PRODUCING SPBCIKS OV AMPHIBOLIPS. 



1. Wing uDiformly dark smoky brown, almost black, with clear spot above 



costal hinge. Scutellum not emarginate and without distinct median 

 frroove on disk behind pits. Abdomen less than .8 as broad as long. 

 Size 4.5 mm. Gall on Q. laurifoUa Michaux and Q. pfiellos Linnaeus. 



7-11 mm. in diameter fuliginosa Ashmead. 



Wing not uniformly smoky, but clouded in radial and apical cells. Scutellum 

 emarginate with median groove on disk. Abdomen .9 as broad as long. 

 Size about 6 mm 2 



2. Parapsidal grooves percurrent but narrow, the median transversely rugose. 



Producing galls 25-35 mm. in diameter, which do not wrinkle or become 

 exceedingly hard in drying. On Q. marUandica Muenchhausen. 



gainesi Bassett. 

 Parapsidal grooves distinct in the sculpture only posteriorly, but their posi- 

 tion indicated the rest of way by broad shallow depressions of surface. 

 Median indistinct. Galls 1.5-25 mm. in diameter, becoming very hard 

 and wrinkled in drying. On Q. rubra Linnaeus, Q. veltitina Lamarck, and 

 probably other red oaks prunus (Walsh). 



Further collecting and rearing will no doubt discover additional 

 species in this group of Amphiholips. No galls of this type are yet 

 known from the Eockies and Great Basin or from the Pacific slope. 



An undescribed gall, probably made by a species of this genus, is 

 tigured on plate 1, figure 1. 



AMPHIBOLIPS FULIGINOSA Ashmead. 



The galls of this species were described as dropping from trees of 

 Q. laurifolia in August. The type flies were found dead in a box of 

 galls put away four years earlier, so date of emergence was not 

 known. The type locality is Jacksonville, Florida. The writer has 

 collected galls on Q. phellos as well as on Q. lauHfolia and at the fol- 

 lowing places: Jacksonville, Live Oak, Lake City, River Junction, 

 Tallahassee, Carrabelle, Gainesville, Ocala, Clearwater, and Daytona, 

 in Florida ; Savannah, Georgia ; Poplar Bluff, Missouri ; and Rosslyn, 

 Virginia. A pupa was found inside a gall on October 22 and an adult 

 December 1. An adult emerged in breeding cage May 1. Transfor- 

 mation takes place in fall and the flies remain in the galls during the 

 winter to emerge the next spring. 



AMPHIBOLIPS GAINESI Bassett. 



The type and only published locality for this species is Austin, 

 Texas. The writer has collected the galls at Mineola, Palestine, Vic- 

 toria, Cuero, and College Station, in Texas; Marianna, Florida; and 

 at Texarkana and Hot Springs, Arkansas. At the latter place the 



