26 



Indiana Vniversitaj Studies 



Andricus operator variety consobrinus, new variety 

 form consobrinus, new form 



FEMALE. — Differs from the bisexual female of variety operator 

 as follows: Parapsidal grooves very slightly widened posteriorly, almost 

 smooth at bottom; foveae rather large, round, sparingly roughened at 

 bottom; mesopleurse finely aciculate centrally; abdomen yellow rufous 

 basally; length 1.2-2.0 mm. 



MALE. — Shows the secondary sexual characteristics of the species, 

 and further agrees with the female of this variety except in having 

 most of the abdomen a brownish piceous, and in being smaller, 1.2- 

 1.7 mm. 



GALL. — Similar to the woolly gall of the other varieties. The types 

 are small, averaging 20. mm. in diameter, the hairs rather brittle and 

 light brown; but more mature galls may differ. On the young stems 

 and aments of Quercus veliitina, Q. marylandica, and Q. coccinea. 



RANGE. — Virginia: Rosslyn. Probably thruout a more southern 

 range in eastern United States. 



TYPES. — 59 females, 140 males, 44 galls. Holotype female, para- 

 type females, and galls at The American Museum of Natural History; 

 paratype females, males, and galls at the U.S. National Museum, Stan- 

 ford University, the Museum of Comparative Zoology, the Philadelphia 

 Academy, and with the author. Labelled Poslyn, Virginia: May 16, 

 1920; Q. marylandica; Kinsey collector. 



The insects emerged at some time after collecting on May 

 16, 1920. The galls appeared immature at the time of col- 

 lecting. This variety comes nearest austrior; the galls are 

 similar; the males differ more than the females. 



The types of opeixitor were collected on marylandica in the 

 District of Columbia, which is very near Rosslyn, Virginia. 

 Nevertheless only 3 of the 202 insects I secured from mary- 

 landica at Rosslyn are operator. The others, representing 

 consobrinus, have the parapsidal grooves much more narrow 

 posteriorly, smoother fovese, and are much smaller in size. It 

 may prove that two varieties occur in two distinct faunal 

 areas which meet near Washington. One of the 48 insects I 

 obtained from Q. coccinea, and all of the 12 I bred from Q. 

 velutina from Rosslyn are consobrinus. I cannot discover any 

 constant differences between this material from the several 

 oaks. 



Andricus operator variety austrior, new variety 

 foi'm austrior, new form 



FEMALE. — Differs from the bisexual female of variety operator 

 as follows: Parapsidal grooves fine, fine posteriorly, smooth at bottom; 

 fovese narrow, shallow, sparingly sculptured at bottom; mesopleuras 



