No. 2368. AMERICAN SUBTERRANEAN GALLS ON OAK— WELD. 227 



the median area on propodeum is broader than high, and the malar 

 space is not over half the length of eye. 



Type.— Cat. No. 22572, U. S. N. M. Twenty-four cotypes. 



Host. — Quercus clirysolepis Liebmann. 



Gall. — Hemispherical when single or forming a hemispherical group 

 with individual galls compressed laterally into angular cross-section 

 by mutual pressure, produced on roots just under surface of ground. 

 Single galls measure up to 22 mm. in diameter by 18 mm. high, groups 

 of two to eight measure up to 35 mm. diameter. Tissue of gall 

 mustard yellow, pithy distally, becoming more compact about the 

 proximally placed larval cell. 



Type locality. — San Gabriel Mountains, California. 



Biology.— Collected one-half mile above Coldbrook Camp in San 

 Gabriel River canyon above Azusa, California, August 6, 1916. The 

 larvae change into pupae about November 1, and into adults later in 

 the autumn, but probably do not emerge until next spring. In breed- 

 ing cage out of doors at Evanston, Illinois, they issued March 10-19. 



27. CALLIRHYTIS ELLIPSOIDA, new species. 



Plate 36, fig. 30. 



^ Agamic female. — A black and tan species. Compound eye, clypeus, 

 tip of mandible, flagellum, broad stripe along parallel and lateral 

 lines on mesonotum, base of scutellum, metanotum, propodeum, 

 metapleura and upper part of mesopleura, sternum, most of sec- 

 ond abdominal segment except a broad oblique band, black or nearly 

 so, there being much variation in different individuals; rest of body 

 pale yellow to fuscous. Head finely rugose, covered with white 

 pubescence except on vertex, mandibles with two sharp teeth, max- 

 illary palpi 4-segmented with first short and second and fourth equal, 

 labial palpi 3-segmented with second almost as long as other two. 

 Eyes bare. Antennae 1 3-segmented with the last twice as long as 

 the preceding and incompletely divided by a groove near the middle 

 or 1 4-segmented with last two subequal. Mesoscutum finely rugose 

 but not transversely so, parapsidal furrows obliterated in front as is 

 also the median, smooth anterior parallel lines extend back over half 

 way and the fine ridges on each side suggest a feather, the lateral lines 

 extend forward half way and are bordered by a pebbled area. Scutel- 

 lum rugose with two rugose pits at the base separated by a narrow ridge 

 and opening behind on to disk. Carinae on propodeum straight, con- 

 verging slightly above, inclosing a reticulate area above rugose petiole. 

 Wings transparent, veins distinct and pale yellowish, very minutely 

 short brown pubescent, ciliate only on hind margin of hind wing, 

 areolet reaching about one-eighth way to basal, cubitus curved and 

 almost reaching basal. Legs with coxae and tarsi darker, hind tarsi 

 shorter than tibiae, tarsal claws simple, divergent. Abdomen smooth 



