400 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



round larval cell is kept in a central position by fine radiating 

 and branching fibres that extend from the cell to the outside 

 shell. 



*D. papula Bassett. 

 " Female : length 2 mm. ; head dark reddish brown, with a few 

 white hairs on the posterior edge of the vertex, vertex finely 

 punctate ; antennae brownish red, darker toward the tip, 13-jointed, 

 the last three joints connate so as to form a rather heavy club; 

 thorax black, lustreless, sparsely covered with hairs, with faint 

 parapsidal grooves converging slightly where they approach the 

 scutel, a very faint median line discernible from the posterior 

 part of the mesothorax and extending one-third the distance to 

 the pronotum, f oveae present on the scutel but indistinct ; legs 

 reddish brown ; abdomen shining black, sheaths of the ovipositor 

 yellow, the ovipositor yellowish brown with the exserted portion 

 at least five times as long as the body. 



The gall of this species is monothalamous and quite often 

 found in clusters of from forty to one hundred. The individual 

 galls are papillous or cone-like and project unequally. They are 

 usually so crowded as to form a confluent mass with pustule-like 

 elevations. They are very hard though only transformed portions 

 of the blade of the leaf. On the under side of the leaf they 

 appear simply as a scar, projecting little if at all. They resemble 

 the galls of Andricus futilis and occur on the leaves of Quercus 

 rubra and Q. tinctoria. 



Type locality : Derby. 



*D. pedunculata Bassett. 

 Female : length 2 mm. ; head black, vertex minutely rugulose : 

 antennae 14-jointed, first and second joints equal in length and 

 very pale yellow, the third a little longer than the two preceding 

 combined, the fourth equal to the first and second united, and 

 brownish at the tip, the remaining joints dark brown and equal 

 in length ; thorax smooth, microscopically punctate, black and 

 shining, with parallel lines obscure but with distinct parapsidal 

 grooves, scutel obscurely punctate, its f oveae indistinct ; legs yel- 

 lowish brown, middle of the femora darker, claws simple ; wings 

 hyaline, veins dull brownish yellow, cubitus reaching nearly to 

 the first transverse vein, radial area open; abdomen bright shin- 



