No. 2368. AMERICAN SUBTERRANEAN GALLS ON OAK— WELD. 195 



Pollock collected these galls on a small oak at Palmer Park, but 

 emergence was almost complete, as only one dead fly was found 

 inside the galls. On August 24, 1919, he collected the galls from 

 which the type flies were obtained and sent in as Hopkins U. S. No. 

 10781 i 1 . They were from Garden of the Gods and then contained 

 pupae. Living flies were cut out of the galls on September 12 and 

 October 3 and 7. The normal emergence is probably in October. 

 The Division of Forest Insects has old galls collected at Manitou in 

 January, 1914, by Mr. B. T. Harvey. The host species of this Colo- 

 rado material is not determined. But the writer lias collected similar 

 galls on Q. gambelii on the Sandia Mountains, New Mexico, at 2,933 

 meters (8,800 feet), and in Arizona at Flagstaff and Williams and in 

 the Santa Catalina and Huachuca Mountains. 



Note. — Similar galls have been seen on Quercus grisea Liebmann in 

 Sandia Mountains, New Mexico, at Prescott, Arizona, and Alpine, 

 Texas; on Q. toumeyi Sargent at Patagonia, Arizona; and on Q. 

 reticulata Humboldt, Bonpland, and Kunth in Huachuca Moun- 

 tains, Arizona. 



2. DISHOLCASPIS LACUNA, new species. 



Plate 28, fig. 2. 



Agamic female. — Reddish-brown to black; eyes and median area 

 on face from ocelli down black; thorax with median black area on 

 mesoscutum tapering to a point on scutellum and two lateral black 

 areas enclosing lateral lines; metathorax, propodeum, and dorsal 

 part of abdomen black. Vestiture whitish. Frons coriaceous, a 

 short median groove below median ocellus and then a ridge to an- 

 tennae, face pubescent and with coarser sculpture, interocular area 

 from 1.3-1.5 times as broad as high, malar space a trifle less than half 

 eye and equal to ocellocular space, mandibles 2-toothed, palpi 5- and 

 3-segmented, antennae reddish, filiform, 13-segmented, fourth and 

 fifth equal, 6-11 gradually decreasing, last twice as long as preceding 

 and incompletely divided below middle by a transverse furrow. 

 Mesoscutum smooth with setigerous punctures, the two black, taper- 

 ing, half-complete parapsides lying in the colored stripes between the 

 median and lateral black areas, parallel and lateral lines smooth and 

 bare. Scutellum in balsam lacunose with a setigerous puncture near 

 front margin of each crescent-shaped depression, arcuate furrow at 

 base smooth and not continuous with steep impressed areas on sides. 

 Propodeum with carinae forming a semicircle almost touching upper 

 margin. Hind leg with femur as broad as coxa, tarsus shorter than 

 tibia, second shorter than fifth, claws with tooth. Wings hyaline 

 with yellowish-brown veins, a brown knot just beyond costal hinge, 

 first abscissa of radius angled, areolet large (its apex and cubitus 

 very pale), surface pale pubescent, margin ciliate. Abdomen smooth 



