36 



Cincinnati Society of Natural History. 



Syntomopus americanus Ashmead. This was reared 

 with the preceding, but probably from the pupae of Agromyza 

 sp. Adults appear in April and early May. Described in 

 Mr. Ashmead's paper. 



Aulax mulgidiicola Ashmead. This species was reared 

 from galls within the stems of Lactuca canadensis L., both at 

 Lafayette, Indiana, and also at Columbus, Ohio. The species 

 had been previously described by Mr. Ashmead, who finds it 

 about Washington, D. C, breeding in Mulgidium acuminatum . 



Chrysocharis compressicornis Ashmead. The types 

 were reared from stalks of Lactuca canadensis L-, within 

 which were the galls of Aulax flavicornis, at Columbus, Ohio. 

 Described in Mr. Ashmead's paper. 



Polyscelis websteri Ashmead. The types were reared 

 with A. mulgidiicola, at Lafayette, Indiana. This may be 

 parasitic on the gall maker, or either Eurytoma aulacis Ash- 

 mead, or Opius aulacis Ashmead, as all four of these species 

 were reared from the same stalks of Lactuca. It seems more 

 probable, however, that the Eurytoma is the host for the 

 Opius and the parasite of the Aulax. This opinion is 

 strengthened somewhat by the fact that Mr. Wm. Brodie, of 

 Toronto, Canada, reared E. aulacis and also Dacnusa crissitela 

 Provancher, from galls of Aulax nabali Brodie, in the stems 

 of Nabalus altissimus Hook. (Can. Ent. Vol. XXIV, p. 12, 

 1892.) This leaves the Polyscelis parasitic on either the 

 Eurytoma or Aulax, with the probabilities in favor of the 

 latter. For description of Polyscelis, see Mr. Ashmead's 

 paper. 



Tetrastichoides lasiopter.E Ashmead. The types of 

 this species were reared from galls of Lasioptera muhlenbcrgicE 

 Marten, formed on Muhlenber gia mexicana Trin. For de- 

 scription, see beyond. 



I may here state that there are two galls formed on Muhlen- 

 bergia, that of Lasioptera muklenbergice Marten, being shown 

 in Fig. 2, Plate II, while the second is formed by Chlorops 

 ingrata Williston. The last is usually smaller, and not so 

 symmetrically formed, and for a time I mistook them for 



