12 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



until the second or third fall. Habits of oviposition unknown. The 

 known species of both genera are found only on the white oaks. 

 Tentative keys for the separation of the species in each genus are here 

 presented together with descriptions of two new species. 



SEPARATION OF PHILONIX AND ACRASPIS. 



Both genera include only agamic females with rudimentary wings and a 

 scutellura of normal length and size, the third segment of antenna always longer 

 than the fourth. 



Scutellum normally rounded behind. Ventral spine truncate, broadest at apex, 



nearly flat and armed with long bristles. Fig. 2 Philonix. 



Scutellura taijering to a point behind and hence triangular. Ventral spine 

 short, stout, rounded behind and hairy; more slender and trough-shai)ed 

 than noiTual. Fig. 3 Acraspis. 



KEY TO DESCRIBED SPECIES OF PHILONIX. 



1. Fore wing not over 3.75 times as long as broad but reaching back beyond 



the second tergite and with typical venation outlined except for areolet. 



Q. lyrata gigas, new species. 



Fore wing more lanceolate, at least four times as long as broad, not reaching 

 to hind margin of second tergiate, with only subcosta and first cross-vein 

 distinct, radial cell seldom suggested 2. 



2. Interocular area square. Wing ratio less than 1.0 (wing length less than 



width of head), broadest behind middle and end rounded. 3.75 mm. New 



York. Gall unknown nigricollis Fitch. 



Interocular area broader than high (ratio 1.1) . Wing ratio at least 1.2 3. 



3. Dark-colored species, abdomen nearly black. Mesoscutum with a median 



polished and nearly bare spot. Eastern United States. Q. alM. 



nigra (Gillette) (=gillettei Bassett), 

 Light-colored species, abdomen slightly infuscated. Pubescence on meso- 

 scutum uniform, no polished bare six»t 4. 



4. Hind tarsus longer than tibia. Under 3.75 mm. Gall imknown. New York. 



fulvicoUis Fitch. 

 Hind tarsus equal to tibia. 4.8 mm. Q. hicolor. Florida. 



lanaeglobuli Ashmead. 



PHILONIX GIGAS, new species. 



Agamic female. — Head, legs, and thorax reddish-broAvn, more or 

 less infuscated, and clothed except on f rons with silvery pubescence : 

 abdomen black, red at tip. Head coriaceous, broader than thorax, 

 broadened behind eyes; interocular space 0.57 transfacial and area 

 1.2 times as broad as high; malar space 0.4 eye and without groove; 

 antennae 14-segmented ; lengths as 21:10:32:27:20:18:5:14:12: 

 11:10:10:10:18. Mandibles 2-toothed; palpi 5 and 3 segmented. 

 Mesoscutum broader than long, smooth with uniformly distributed 

 setigerous punctures ; parapsidal grooves narrow, deep, smooth, per- 

 <;urrent, almost straight, well separated behind ; anterior and lateral 

 lines represented only by infuscations. Scutellum disk circular, 

 slightly rugose behind, arcuate furrow at base. Propodeum smooth 

 except on rugose neck; usual carinae not developed. Mesopleurae 

 smooth and pubescent. Hind leg with femur stouter than coxa; 



