THE CANADIAN ENTOMOLOGIST 



213 



teen-segmented; first and second segments enlarged, third segment one-half 

 again as long as the fourth ; segments five to thirteen nearly equal in size, seg- 

 ment fourteen conically attenuated, all the segments with rather heavy yellowish 

 pubescence; segments one and two yellow testaceous, the others blackish. 

 Thorax : black ; pronotum rather coarsely punctulate with rather uniform yellow- 

 ish white pubescence; mesonotum smooth, polished, parapsidal grooves deep, 

 rather close together at the scutellum widely divergent anteriorly; scutellum 

 coarsely and irregular rugulose, very sparsely pubescent. Legs : yellowish tes- 

 taceous rather uniformly covered with paler pubescence ; basal, tarsal segment 

 shorter than 2 to 5 ; wings transparent, veins brownish, areolet small. Abdo- 

 men : highly polished, second segment about as long as the rest of the abdominal 

 segments united, second segment with a few sparse hairs laterally. Length 

 average 2.4 mm. 



Holotvpe. Female, bred from galls on Quercus marylandica Muench., 

 Raleio-h, North Ca-roUna deposited in the United States National Museum. 



Paratypes. Three females and one gall in the collection of the United 

 States National Museum, bred from similar galls. 



(Pig. 2 1. Andricus peltatus, Antenna. 2. Anclriciis peltatus, portion ol wing show- 

 ing radial vein (R) marginal cell (M. C.) and areolet (A). 3. Dithalamous 

 gall (a 1). 4. (Median vertical section of preceding (x 1). 5. Two bract-like 

 appendages from gall showing peltate character (x 2). 



Andricus peltatus Wells and Metcalf, Cecidium nov. 



On Quercus marylandica Muench., sessile on stem at nodes (originates 



from apical meristem of lateral bud) on branch portions from 1-5 years old; 

 prosoplasma, concentric type with up-walled superstructure; flask-shaped, the 

 neck bearing numerous, sparsely hairy bract-like appendages which are reflexed 

 and overlap shingle fashion. Appendages greenish with red-tinged hairy tips, 

 peltate, lanceolate, stalk short. When young very thickly covered with acicular 

 trichomes some of which are of the compound stellate type ; 8-14 mm. high, 

 14-22 mm. wide at base including appendages ; 1 or sometimes 2 larval cells in 

 proximal half (Fig. 4), distal false chambers corresponding, walls thick, thin 

 sclerotic layer dififerentiated around nutritive layer lining the chamber ; rare, 

 Raleigh. North Carolina. Types in collection of B. W. Wells. The above de- 

 scription is based on six mature and four immature specimens. 



