ART. 19. GALLFLIES OF THE FAMILY CYNLPIDAE WELD. 17 



of propodeiim converge slightly above and the first and second cross- 

 veins are not clouded. 



Determined as this species without direct comparison with the 

 type, the writer has specimens taken at Great Falls, Virginia, and 

 others taken ovipositing in buds of Q. coccinea at Washington on 

 March 27, 1921. Some of these specimens have 13 and others 14 

 segments in antenna, while corrugis was described as 14-segmented, 

 but the number may vary. If these are correctly determined the only 

 character so far found to separate them from yetrosa Weld is the 

 length of the ovipositor, ratio 3.26 in fetrosa and 4.8 in those deter- 

 mined as corimgis. 



The gall of coi'rugis is still unknown. The sculpture of the fly 

 suggests that it came from a stone gall in an acorn, probably on 

 coccinea or Uicifolia. The alternating generation is also unknown. 



CALLIRHYTIS FRUTICOLA Ashniead. 



The first of the " stony " acorn galls recorded in the American 

 literature were sent by Thomas Meehan, of Philadelphia, to Dr. C. V. 

 Riley, whose notes (105a?) say that when opened December 1, 1871, 

 he found one " fully perfected " fly. In 1875 Hubbard found similar 

 galls inside of acorns at Detroit. Later Koebele sent what was then 

 supposed to be the same thing from Alameda, California {milleri of 

 this paper). In 1892 Miss Murtfeldt found galls in Missouri and in- 

 timates that both Hubbard and Riley have reared it. Ashmead de- 

 scribed the species from six specimens and says the acorns in Riley's 

 collection were those of " Quercus tinctoHa " Michaux and that the 

 flies were reared April 3, 1873. 



The type material in the national collection consists of four flies 

 on one pin with the label "105a^, acorn stony gall " with no locality or 

 date. The acorns in the collection are from Detroit. The source and 

 host of the species is thus in doubt. Moreover, one of the four type 

 flies is different from the other three, being larger and with different 

 sculpture. Although the description applies equally well to both, 

 the writer prefers to assume that the three smaller flies are frutwola 

 Ashmead and that the larger one is new, but as its host is not now 

 known it is not here described. Flies agreeing with the above types 

 of fruticola have been reared by the author from affected acorns of 

 Quercus marilandica Muenchhausen collected at Ironton, Missouri, 

 October 5, 1917, giving one definite host record for this species. The 

 flies were cut out of the galls December 1, 1919, but the normal emer- 

 gence would probably have been in the spring of 1920. Two of the 

 fruticola types measure 2.5 and 2.7 ram. The author's 29 flies from 

 Ironton range from 1.8-3.0 mm. Average 2.54 mm. The Pilate col- 

 lection from Opelousas, Louisiana, contained 13 specimens, obtained 



