28 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6S 



galls were collected in September it is the writer's idea that at that 

 time the nutritive layer had not been all used up and the larva had 

 vitality to transform into an undersized adult but not enough to 

 chew its way out of the hard gall. Never having been exposed to 

 light and open air it is much paler than flies that emerge normally. 

 Had it darkened up normally the two adjacent spots near the apex 

 of the wing might have become connected into one double one as 

 is the case in nuMIa, a series of which shows considerable difference 

 in the amount of fusion that has taken place in the spots, due either 

 to fluctuating variation or to the length of time that has elapsed or 

 amount of exposure to light since emergence from the gall. If a 

 7iubiJa wing were bleached somewhat it would present the condition 

 seen in inconiptus. 



DIPLOLEPIS OCCULTATA, new species 



Fe7nale. — Black, the tibae, tarsi, antennae, and ventral spine honey- 

 yellow. Head coriaceous with appressed whitish hairs; from above 

 broader than thorax but not massive, cheeks broadened behind eyes, 

 occiput concave ; from in front facial area higher than broad, malar 

 space .fS eye without gi'oove, antenna 13-segmented, lengths as 

 (scape) 11 (with 5) :9(5) :10(4) : 9: 9 : 9: 9 : 9 : 9 : 8: 8 : 7.5 : 16(5), the 

 last with transverse groove on one side incompletely dividing it into 

 two segments as 6:10 in length, flagellum becoming stouter and 

 sometimes infuscated toward tip. Thorax with sparse appressed 

 pubescence not hiding sculpture, mesonotum coriaceous, parapsidal 

 grooves smooth, percurrent, separation behind about width of groove, 

 no median, anterior and lateral lines distinct; disk of scutellum 

 rugose, groove at base indistinctly separated into two smoother pits. 

 Carinae on propodeum straight, slightly converging above. Meso- 

 pleura with bare shining spot. Tarsal claws with distinct tooth. 

 Wings hyaline, pubescent, ciliate, veins yellowish-brown, second 

 abscissa of radius angled, areolet reaching one-sixth, cubitus two- 

 thirds way to basal. Abdomen shining, shorter than head and 

 thorax, higher than long, lengths of tergites along dorsal margin 

 as 51 : 10, the rest telescoped in most pinned specimens, the second 

 but slightly pubescent on sides at base, its hind margin at angle of 

 about 45°. Ventral spine in side view about three times as long as 

 broad. Using width of head as a base the length of mesonotum 

 ratio is 1.1, antenna 1.8, ovipositor 2.0, wing 3.1. 



Length, 1.6-2.5 mm. Average of 117 specimens, 2.19 mm. 



Type.— Cut. No. 27964, U.S.N.M. Type and 38 paratypes. Para- 

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

 Academy, and Philadelphia Academy. 



Host. — Quercus lohata. 



