ART. 10 GALL-INHABITING CYNIPID WASPS WELD 117 



each side; from in front broadest above middle, malar space .55 eye 

 without groove, antenna 13-segmented lengths as (scape) 13 (width 

 5.5) : 8 (5) : 13 (4) : 10 : 9 : 9 : 9 : 9 : 9 : 9 : 8.5 : 8 : 13 (6) . P r o n o t u m 

 broad in middle and subtruncate. Mesoscutum broader than long, 

 coarsely transversely rugose, parapsidal grooves percurrent, broader 

 behind, no median, anterior and lateral lines not prominent. Disk 

 of scutellum rugose, tapering toward apex which is slightly truncate, 

 with tAvo distinct smooth pits at base. Carinae on propodeum heavy, 

 arcuate with a spur on outer side of each to spiracle, neck smooth. 

 Mesopleura bare, polished. Hind tarsus about as long as tibia, its 

 segments as 18 : 9 : 7 : 5 : 9 (with claw 11) , claws weak, simple. Wing 

 hyaline, pubescent, ciliate, veins brown, first abscissa of radius 

 arcuate, half as long as second, radial cell closed, two and four-tenths 

 times as long as broad, no areolet, cubitus directed toward and reach- 

 ing half-way to lower end of basal. Abdomen as long as head and 

 thorax, length to height to width as 86 : 60 : 45, almost truncate pos- 

 teriorly, first tergite smooth, the big tergite on dorsal margin and the 

 fourth on the posterior with lengths as 77 : 21, the fourth and poste- 

 rior portion of the big one microscopically punctate, pubescent 

 patches at base, ventral valves parallel with long hypopygium, ven- 

 tral spine very short. Using width of head as a base the length of 

 mesonotum ratio as 1.1, antenna 2.2, wing 3.0, ovipositor 3.4. 

 Length, 1.9-2.4 mm. Average of 8 specimens, 2.27 mm. 



Male. — Differs from female in having 14-segmented antennae, 

 lengths of first five as 13:8:28:11:11 — the third bent, swollen at 

 apex, stouter than scape, flagellum tapering from third to tip. 

 Abdomen shorter than head and thorax, truncate behind big tergite, 

 lengths along dorsal and posterior curvature as 55 : 20 : 2 : 1 : 13, last 

 coarsely punctate and pubescent, punctation of big tergite and fol- 

 lowing one as in female. Length, 2.1-2.45 mm. Average of 9 speci- 

 mens, 2.26 mm. 



Type.— Cat. No. 27227, U.S.N.M. Type female, allotype, 3 female 

 and 3 male paratypes. Paratypes at Field Museum and Stanford. 



Biology. — Living flies were cut out of galls on Mimosa hiuncifera 

 on August 10, 1918. The galls are abrupt stem swellings produced 

 on one side of the twigs, globular or ellipsoidal in shape, measuring 

 up to 20 mm. in diameter, covered with normal bark and consisting 

 of parenchymatous tissue in which are many cells. The preserved 

 galls become very hard but contain no true wood. The flies are 

 thought to be guests but the maker of the gall is yet to be determined. 



Habitat. — The type material is from the Huachuca Mountains, 

 Ariz, The galls were collected July 10, 1918 at the mouth of Carr 

 Canyon. The galls have been observed in the Chiricahua, Mule, 

 Patagonia, Santa Rita and Santa Catalina Mountains. 



