AET. 19. GALLFLIES OF THE FAMILY CYNEPIDAE WELD. 19 



Gall. — A mass of thin-walled woody cells inside full-grown acorns 

 of normal appearance or often biilging out on one side (fig. 3). The 

 mass lies below or obliquely to one side of the cotyledons, which are 

 always present and of normal texture. The cells in the mass are 

 more or less separable, each being shaped like an apple seed -4 by 3 

 by 2 mm. There may be as 

 many as 15 cells in the mass 

 and they separate more or less 

 with the decay of the cotyle- 

 dons. Occurs in fall. This is 

 the first American instance 

 of a gall of this type in the ^.^^^ s.-CALLinnrTis lapillula, xew spe- 

 acorns in one of the white-oak cies. cells in acorns of bicolor. 



V 1 



group. 



Habitat. — The type locality is Evanston, Illinois, where infested 

 acorns were collected from two trees at various times from 1910 to 

 1917. In breeding cage it is two years at least before adults appear 

 and the emergence is distributed over more than one season. The 

 larvae transform to pupae and adults in the fall (in September), the 

 flies remaining in the galls to emerge in the spring between April 

 25 and May 16. One was captured May 28. Sciara coprophyJla 

 Lintner was also reared from the decaying acorns in spring. 



CALLIBHYTIS BALANOSA, new species. 



Plate 5, fig. 18. 



Female. — Reddish-brown, face and femora yellowish, tibiae, tarsi, 

 antennae, anterior and lateral lines, base of scutellum, propodeum 

 and abdomen much darker, almost piceous, eyes and ocelli black. 

 Head almost as broad as thorax, seen from in front elliptical, 

 broadest below level of antennae, facial line .6 transfacial. interocular 

 area 1.75 times as broad as high, antennocular space less than 

 ocellocular, malar space .5 eye and with groove: seen from above 

 broadened behind eyes, thickness .4 width ; mandibles 2-toothed, palpi 

 5- and 3-segmented, antennae 14-segmented. third equal to one plus 

 two. fourth .74 third, gi-adually decreasing to 13 which is .37 third, 

 last one and two-thirds times preceding, face pubescent with median 

 elevation below antennae. Mesoscutum broader than long, coriace- 

 ous with setigerous punctures, parapsidal grooves deep, smooth, 

 percurrent, broader behind where their separation is greater than 

 that between parallel lines, median shorter than lateral lines, pubes- 

 cence oppressed, not hiding sculpture. Scutellum .64 as long as 

 mesoscutum, broad, rugose behind, pubescent, pits at base deep, 

 smooth, distinctly separated. Carinae on propodeum curved out- 



