54 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.68 



parapsidal grooves smooth, deep, percurrent, no median. Pits of scu- 

 tellum pear-shaped, smooth, widely separated, disk smooth in front, 

 rugose behind. Carinae on propodem arcuate, enclosed area smooth, 

 broader than high. Mesopleura smooth, bare. Tarsal claw with a 

 strong tooth. Wing just reaching tip of abdomen, hyaline, pubes- 

 cent, ciliate, venation normal, brown, second abscissa of radius nine 

 and one-half times first, no areolet, cubitus indistinct. Abdomen 

 longer than head and thorax, length to height to width as 95 : 79 : 56; 

 lengths of tergites along dorsal margin as 58 : 20. 18 : 9 : 6 : 7, second 

 with small pubescent areas at base, ventral spine slender, in side 

 view about eight times as long as broad. losing width of head 

 as a base, the length of mesonotum ratio is 1.0, antenna 2.7, oviposi- 

 tor 5.4, wing 2.8. Length 1.5-2.35 mm. Average of 100 specimens 

 1.85 mm. 



Type.— Cat No. 27201, U.S.N.M. Type and 39 paratypes. Para- 

 types in American IMuseum, Field, Stanford, Harvard, California 

 Academy, and Philadelphia Academy. 



Host. — Quercus garryana. 



Gall (fig. 41). — A convex mass of tubular galls standing side by 

 side in a compact cluster on the under side of the leaf in the fall. 

 The mass measures up to 25 mm. long by 15 mm. wide. The 

 individual galls are easily detached, especially in preserved speci- 

 mens, white or cream-colored, up to 9 mm. long, tapering gradually 

 from the base to a diameter of about 3 mm. at the distal open end, 

 the distal portion beset with tapering spines which are often 

 rosy at the tip. The single larval cell lies midway of the length 

 of the gall and measures about 2 mm. long by 1.2 mm. in diameter. 

 The tissue of the dried galls is of crystalline hardness so that the 

 insects are unable to chew their wa}'^ out of preserved specimens. 



Habitat. — The type material was collected September 8, 1922, in 

 Sequoia National Park, Calif., just above the Cedar Creek check- 

 ing station on the road to Giant Forest. At that time the galls 

 contained full-grown larvae. Living flies were cut out of the galls 

 on November 10. These galls were seen just starting to develop at 

 McLeod, Oreg., on July 22. They were also seen at Yreka, Calif., 

 and the Stanford collection has galls from Siskiyou, Oreg. 



TRICHOTERAS COQUILLETTI Ashmead 



The writer collected galls on Quercus chrysolepis at Camp Baldy, 

 June IG, 1918, wdien they seemed too innnature to rear but flies, agree- 

 ing with the types, emerged January 15, 1919. In September, 1922, 

 galls were collected in the Santa Ana Mountains (a living fly cut 

 out November 14) and at Idyllwild and adults were cut out on 

 January 23. 



