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 striae numbering from 78 to 81. 
In one example 70 striae 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 mm in length. Eggs and young occur in June. 
27. Phytoptus sp. 
This species produces galls on the leaves of the white ash, Fraxinus 
umericana 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 Bloomiugton, 111., in June, 1881. 
Striae from 53 to 53. 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 tumus Linn. (Miss C. G. Soule, Can. Ent. xviii, p. 139.) 
29. Papilis glaucus Linn., on Fraxinus of all species. 
30. Sphinx kalmiw Abbot and Smith. (Liutner, Ent. Contr. i, p. 188.) 
31. Smerinthus geminatus Say. (Psyche, ii, p. 72.) 
32. Callimorplia sufusa Smith (Marlatt, Trans. Kans. Acad. Sc, 1837-88, 
p. 113.) 
33. SpUosoma virginica Fabr. (Riley's MS. notes.) 
31. Halesidota maculata Harris. (Harris' Correspondence, p. 290.) 
35. Halesidota caryce Harris. (Ohio, Pilate.) 
36. Platysamia cecropia (Linn.) (Riley's MS. notes.) . 
37. Telea polypliemus (Cram.). (W. Brodie, Canada.) 
38. Callosamia promethea (Drury). 
39. Hyperchiria io (Fabr.). 
