216 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



18. CALLIRHVTIS CORALLOSA, new Bpecies. 



Plate 32, figs. 16, 17. 



Female. — Reddish brown to black in some individuals, with com- 

 pound eye, anterior and lateral line areas on mesonotum black; 

 head, thorax and legs covered with whitish or tawny pubesence as in 

 Disholcapis . Head finely punctate, not as broad as thorax, mandibles 

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

 the last not quite twice as long as preceding and in one specimen in 

 balsam showing a faint subdivision into two, facial quadrangle trans- 

 verse. Mesoscutum punctate, parapsidal grooves deep, smooth, per- 

 current; smooth bare parallel lines extend back half way, longer and 

 more distinct than the lines over base of wing, median groove wanting 

 or a mere notch on hind margin. Scutellum broader than long and 

 truncate or faintly excavated behind with two well-separated smooth, 

 oval pits at base; propodeum with two almost straight and parallel 

 ridges inclosing a somewhat rugose area broader than high, no median 

 ridge. Legs stout, hind coxae with a sharp ridge behind, tarsal 

 claws simple, divergent. Wings dusky with distinct brown veins, 

 second cross-vein angled, areolet reaching one-fifth and cubitus two- 

 thirds way to basal, surface pubescent, margin ciliate. Abdomen 

 smooth and shining, not compressed, the large pubescent areas on 

 sides of second segment widely separated dorsally and nearly reaching 

 the hind margin, exposed parts of the other segments microscopically 

 punctate and the seventh pubescent. Ventral spine tapering and in 

 balsam about five times as long as broad. Ovipositor when dis- 

 sected out a little longer than antenna. Using width of head as a 

 base, the length of mesonotum ratio is 1.4-1.6; antenna, 2.1-2.3; 

 ovipositor, 2.0-2.6; wing, 3.5-4.0. 



Range in length of 14 specimens, 4.6-6.3 mm. Average 5.4 mm. 



Runs in Dalla Torre and Kieffer's key (1910) to Callirhylis crypta 

 Ashmead, from which it is separated by its large size, distinct parap- 

 sides, lack of median groove, and presence of a distinct areolet. 



Type.— Cat. No. 22567, U.S.N.M. Type and 4 paratypes. 



Host. — Quercus macrocarpa Michaux, Quercus alba Linnaeus, 

 Quercus bicolor Willdenow, Quercus stellata Wangenheim, Quercus 

 prinus Linnaeus, and Quercus chapmani Sargent. 



Gall. — At base of thrifty sprouts about stumps or on bark of small 

 trees just below surface of ground, 12-15 mm. in diameter and 6-10 

 mm. high, brown, convex, button-shaped, irregularly ridged exte- 

 riorly, some being much more rugose than others, with a clasping 

 or sessile base and when broken off showing an impressed scar with 

 radiating ridges which become more conspicuous in decaying galls 

 Galls on stellata, chapmani, and prinus are much smoother externally 

 than those on the other three hosts mentioned and those figured 



