152 NEW YORK STATE MUSEUM 



pale, silken thread back and forth and attaching it to either side. 

 The threads issued from its mouth or at some point near that cavity, 

 possibly a minute spinneret. The woven cap was irregular in tex- 

 ture, due in part to irregularities in the width of the silken thread 

 and probably somewhat to the larva making a thicker layer in 

 some parts than in others. 



Gall. The gall is a very irregular, frequently asymmetrical 

 enlargement of the stem and having a diameter of .5 to 1.5 cm and 

 a length of .5 to 2 cm or more. The interior is spongy and occupied 

 by a number of silken chambers and apparently irregular galleries 

 (pi. 4, fig. 1). 



Larva. Length 1.5 mm, rather stout, pale yellowish. Head 

 small; antennae short, stout; breastbone strongly chitinized, 

 expanded apically, tri dentate, the median tooth small. Skin finely 

 shagreened, posterior extremity broadly rounded. 



Male. Length 1.5 mm. Antennae short, dark brown, yellowish 

 basally; 16 segments, the fifth with a length one-fourth greater 

 than its diameter; terminal segment slightly produced, broadly 

 oval. Palpi; first and second segments apparently very short, 

 stout, the third somewhat longer and the fourth apparently twice 

 the length of the third, very slender. Mesonotum shining dark 

 brown, sparsely margined posteriorly and laterally with yellowish 

 setae, the submedian lines indistinct. Scutellum dark brown, post- 

 scutellum fuscous. Abdomen dark brown, segments one to five 

 with submedian lunate spots posteriorly, those on segments six and 

 seven nearly obsolete. Wings hyaline, costa dark brown, the discal 

 spot yellowish and a little before the basal half. Halteres pale 

 yellowish. Coxae and femora basally fuscous yellowish, the distal 

 portion of femora, tibiae and tarsi dark brown, the segments of the 

 latter narrowly banded basally, the fourth and fifth with a yellowish 

 cast, the posterior legs with the third to fifth segments broadly and 

 indistinctly yellowish banded basally, the fourth and fifth mostly 

 yellowish and only slightly fuscous apically; claws moderately stout, 

 the pulvilli shorter than the claws. Genitalia; basal clasp segment 

 long, slender; terminal clasp segment swollen basally; dorsal plate 

 short, deeply and narrowly emarginate; ventral plate long, broadly 

 rounded. Harpes-long, irregularly rounded. 



Female. Length 2.5 mm. Antennae with 23 segments, the fifth 

 with a length three-fourths its diameter; terminal segment slightly 

 produced, narrowly oval. Palpi; first segment short, stout, the 

 second with a length three times its diameter, stout, the third as 

 long as the second, the fourth a little longer than the third. Meso- 

 notum dark brown. Scutellum fuscous yellowish, postscutellum 

 fuscous. Abdomen dark brown, segments one to six with submedian, 

 lunate, white spots posteriorly and triangular, white marks at the 

 postero-lateral angles; ovipositor yellowish, venter white. Halteres 

 pale yellowish. Coxae and femora basally fuscous yellowish, the 

 distal portion of femora, tibiae and tarsi dark brown, the latter 

 narrowly banded basally with yellowish on the anterior and mid 



