226 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



Gall.— Abrupt cushion-like swelling in the bark just at or below 

 the surface of the ground on young sprouts which are 5-10 mm. in 

 diameter. Single or confluent so that they may contain one to a 

 half a dozen cells which are 4-5 mm. in diameter. They are similar 

 to those of CallirJiytis rubida Weld. 



Type locality. — Fort Sheridan, Illinois. One cluster of these galls 

 was found April 25, 1915, and one fly emerged in collecting box and 

 two were cut out of galls. Three more of same species were found 

 ovipositing in the side of the swelling buds in the same clump of 

 sprouts at whose base the galls were found. 



26. CALLIRHYTIS FULVA, new species. 

 Plate 34, fig. 24. 



Female. — Dark red and black. Head finely rugose, broadened 

 behind eyes, cheeks a trifle longer than half the length of eye. Man- 

 dibles two-toothed, palpi 5- and 3-segmented, antennae 13-segmented, 

 third longest, last over twice as long as preceding and incompletely 

 divided by a transverse groove into two whose lengths are in the 

 ratio of 9 to 14, or 14-segmented, with no suggestion of fusion of last 

 two. Mesoscutum rugose in front but not transversely so, with a 

 few inconspicuous hairs from scattered punctures. Parapsidal 

 grooves rugose, deep and broad behind, complete but less distinct in 

 front, median line percurrent, smooth parallel lines and lines over 

 base of wings black. Scutellum coarsely rugose, the two pits dis- 

 tinctly bordered laterally but opening posteriorly out on to disk and 

 separated only by a low median ridge, with impressed pubescent 

 areas at sides above base of hind wings. Propodeum with two 

 straight parallel ridges inclosing a smooth but pubescent area slightly 

 higher than wide. Mesopleura finely longitudinally striate. Legs 

 lighter in color, tarsal claws weak, simple, divergent. Wings with 

 yellowish veins, the second cross-vein brownish, bent at 'an angle 

 and usually with a short spur, areolet incomplete or absent, surface 

 pubescent, margin not ciliate. Abdomen black, smooth, and shining, 

 slightly compressed, longer than deep, second segment with two lat- 

 eral oval pubescent patches at base nearly touching dorsally, hind 

 margin of all microscopically punctate. Ventral spine in balsam a 

 little more than twice as long as broad. Ovipositor when dissected 

 out shorter than length of antenna, ovarian eggs well developed. 

 Using width of head as a base, the length of mesonotum ratio is 1.3; 

 antenna, 2.5; wing, 3.7-3.8; ovipositor, 1.7. 



Range in length of 50 pinned specimens, 3.0-4.0 mm. Average 

 and median, 3.6 mm. 



Related to CallirJiytis radicis Bassett, to which the individuals 

 with 14-segmented antennae run in Dalla Torre and Kieffer's key 

 (1910). The pits of radicis do not open out behind on to scutellum> 



