194 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 59. 



1. DISHOLCASPIS ACETABULA, new species. 



Plate 28, fig. 1. 



Agamic female. — Reddish brown; eyes, ocelli, flagellum, area about 

 parallel lines, areas about latei al lines, base of scutellum, mesosternum, 

 metathorax and propodeum black, abdomen infuscated dorsally. 

 Head finely rugose, face with setigerous punctures and a transverse 

 dark band through base of antennae, clypeus truncate, malar space 

 striate, four-tenths eye, interocular area one and one-third times as 

 broad as high, transfacialline 1.2-1.4 times facial, mandibles 2-toothed, 

 palpi 5- and 3-segmented, antennae 13-segmented, third and fourth 

 subequal, 5-12 gradually shorter, last twice as long as preceding. 

 Mesoscutum smooth with setigerous punctures, parapsides deep, 

 smooth, reaching half-way, wider behind, median black area extend- 

 ing two-thirds way back to scutellum, black area about each lateral 

 line. Scutellum granular under lens, in balsam seen to be pitted 

 witli shallow contiguous depressions in each of which there is a seti- 

 gerous puncture, faintly rugose behind, arcuate base opens out on to 

 disk on which is a shallow median longitudinal groove. Propodeum 

 with almost perfect semicircular ridge reaching two-thirds way to 

 upper margin. Legs stout, coxae infuscated, hind femur spindle- 

 shaped, tibia longer than tarsus, claws with tooth. Wings hyaline, 

 veins black, first abscissa of radius angled above middle with spur, 

 areolet reaching one-third and cubitus two-thirds way to basal, surface 

 brown pubescent, margin ciliate. Abdomen smooth and shining, 

 not compressed, second segment making about one-half in living 

 specimen, well-separated patches of pubescence on sides, seventh 

 sparsely pubescent, ventral spine tapering, in balsam twice as long as 

 broad, ovipositor when dissected out over one and one-fifth times 

 length of antenna. Using width of head as a base the length of 

 mesonotum ratio is 1.5-1.6; antenna, 2.35; ovipositor, 2.S5--3.0; wing, 

 4.5-4.8. 



Length of 58 pinned specimens ranges from 4.0-5.3 mm. Aver- 

 age, 4.5 mm. 



Type.— Cat. No. 22574, U.S.N.M. Forty cotypes. 



Host. — Quercus gambelii Nuttall. 



Gall. — Brownish-red hard bullet galls in clusters at base of small 

 sprouts, hidden by debris. Individual galls are 6-9 mm. in diameter, 

 sessile, somewhat elongated, usually blunt, but sometimes pointed at 

 apex. Surface finely wrinkled in preserved specimens. Interior of 

 dense cellular tissue with a central thick-walled non-separable stony 

 white larval cell. Exit hole in side. Occur in fall. 



Type locality. — Colorado Springs, Colorado, in the Garden of the 

 Gods. The writer found old empty galls there June 30, 1915, and 

 fresh galls not yet full grown. On November 14, 1918, Mr. J. H. 



