ASH GALL-MITES. 555 



bottom of the cavity just over the opening. Side folds may be formed from the 

 primary ones. The largest gall measured was .13 inch in diameter and .13 inch in 

 height, measuring the projection on both sides of the leaf. Dr. F. A. W. Thomas 

 describes a still more peculiar gall from a European Fraxinus. This gall was 

 abundant in central Illinois during the summer of 1880 and 1881. 



The Mite. — This is a very finely striate species, the striie numbering from 78 to 81. 

 In one example 70 strite were counted, but as in others the number was so uniformly 

 above 70, a mistake may have been made in counting. The feather-like appendage 

 has two pairs of widely divergent prongs. An example mounted in glycerine meas- 

 ures .048'"'" in length. Eggs and young occur in June. 



27. Phytoptus sp. 



This species produces galls ou the leaves of the white ash, Fraxinus 

 nmericana Linn. 



The gall resembles very closely that on Fraxinus viridis. Like that 

 it projects equally above and below the leaf. The upper and under 

 surfaces have a slight clothing of white hairs. The walls are thick and 

 are produced into the cavity. The height, measuring that above and 

 below the leaf, is about .085 inch, and the diameter is about the same. 



A very peculiar cecidium, quite different in character from the above, 

 was also found on the white ash, but no Phytoptus was found in it. It 

 consisted of innumerable small, deformed leaves and twigs which had 

 been prevented from developing by the mites. The whole mass dries 

 up and remains on the trees during the winter, at that time resembling 

 a fungoid growth. 



Both of these Cecidii occurred at Bloomington, 111., in June, 1881. 



Striae from 53 to 58. Feather-like appendage with two pairs of prongs. Length 

 .007 inch. The hairs on the underside of the cephalothorax are easily seen in this 

 species. (H. Garman.) 



The following insects also occur on the ash : 

 Order Lepidoptera. 



28. Papilio turnus Linn. (Miss C. G. Soule, Can. Ent. xviii, p. 139.) 



29. Papilis glaucus Linn., ou Fraxinus of all species. 



30. Sphinx kalmice Abbot and Smith. (Lintner, Ent. Contr. i, p. 188.) 



31. ISmerinthus geminatus Say. (Psyche, ii, p. 72.) 



32. Gallimorpha sufusa Smith (Marlatt, Trans. Kans. Acad. Sc, 1887-88, 



p. 113.) 



33. Spilosoma virginica Fabr. (Riley's MS. notes.) 



34. Ralesidota maculata Harris. (Harris' Correspondence, p. 290.) 



35. Ralesidota caryce Harris. (Ohio, Pilate.) 



36. Platysamia cecropia (Linn.) (Riley's MS. notes.) 



37. Telea polypJienms (Cmm.). (W. Brodie, Canada.) 



38. Callosamia promethea (Drury). 



39. Hyperchiria io (Fabr.). 



