134 crXirTDOrS GALLS AKD GALL-WASrS—AmMEAD. vol.xix. 



. AULAX CAVICOLA, new species. 



Female. — Length, 'lA to 3 mm. This species bears a very close resem- 

 blance to A.mulgediicola, but ditt'ers as follows: The face is witliont the 

 median ridge; the sliort median groove of tlie mesonotum is longer, 

 extending not quite to the michlle; tliere is a distinct groove on the 

 shoulders, extending from the base forward to at least half their 

 length: the second and third abdominal segments dorsally at base are 

 very dark, almost black, making the abdomen appear as if banded, while 

 the basal joint of i)osterior tarsi is longer than it is in A. muh/ediicola. 



Type.—yo. 3003, T.S.N.M. 



Described from two female s])('cimens, labeled Indian Cave, Missouri, 

 April 30, 1878. 



3i). AULAX SONCHICOLA, new species. 



Male and female. — Length, L'.L* to 2.0 mm. This si)ecies is likewise 

 closely allied to Anlax mi(}gediicola, but the antenna* in both sexes 

 are distinctly 14-jointed, ])ale brownish yellow, the two basal joints 

 dusky or black, more noticeable in the male, tlie terminal joint being 

 very much longer than the i)receding. The abdomen in female is red- 

 dish brown, obfuscated dorsally, in the male blackish; legs brown, 

 with the j)()Steri()r tibia* more or less dusky. Thorax subpubescent, 

 and in addition to the parapsidal grooves there are two short indistinct 

 median grooves anterimiy and a distinct median groove posteriorly, the 

 foveje shallow, small, the mesopleura finely striated. 



Wings hyaline, ])ubescent, the venation as in A. miilf/ediicoJa. 



Type.—:So. 3094, U.S.X.M. 



Four specimens, reared during June, 1887, from a gall occurring on 

 the stem of a species of wild lettuce, Sonchus oleraceiis, foirnd at Ashe- 

 ville, North Carolina, by the writer. In my own collection ai-e speci- 

 mens collected in Canada. 



40. AULAX AMBROSI.^COLA, new species. 



Gall. — The insects from which the following description is drawn up 

 were received from Miss Mary Murtfeldt, of Kirkwood, JNIissouri, with 

 the statement that they were ])arasitic on a lepidopterous gallmaker, 

 on AmbroHia, 



Now there is some mistake here; the Hies are unciuestionably true 

 gallmakers and evidently foim larval cells in the pith of this plant, not 

 observed by INIiss ^Murtfeldt; and, moreover, their structural characters 

 prove conclusively that they are not i)arasitic. It is also (luite probable 

 that the Lei)idopteron is in«iuiliiious in the galls produced by this 

 species. 



GaUJiy. — Male and female. Length, 2 to 2.2 mm. In size, structure, 

 and general ai)pearance this species comes remarkably close to Aulax 

 mnJiiediicoJa; but with a very high jjowcr lens the sculi)ture appears 

 very distinct, the punctuation being slightly transverse. There is a 



