REPORT OF THE STATE ENTOMOLOGIST 1918 159 
mm in diameter and tightly packed in the cones. The galls are 
evidently modified or aborted seeds. 
Retinodiplosis inopis O. S. 
1862 Osten Sacken, C.R. Mon. Dipt. Am., 1:196-97 (Cecidomyia) 
1890 Packard, A.S. U.S. Ent. Comm., 5th Rep’t, p. 800 (Diplosis) 
1891 Riley, C. V. & Howard, L. O. Insect Life, 4:126 (Polygnotus pini- 
cola Ashm. reared) 
1906 Felt, E.P. N.Y. State Mus. Mem. 8, 2:752 (Cecidomyia) 
1910 Smith, J.B. Insects N. J. List, p. 732 (Cecidomyia) 
1911 Felt, E. P. Econ. Ent. Jour., 4:465 (Cecidomyia) 
1912 —  —— Econ. Ent. Jour., 5:368-69 (Itonida) 
1913. ———— Econ. Ent. Jour., 6:331 (Itonida) 
1918 ——— N.Y. State Mus. Bul. 200, p. 15 
This midge produces obscure subcortical swellings (fig. 30a) in the 
smaller branches of the scrub pine, Pinus rigida and P. 
virginiana, spins cocoons on branches and needles (figs. 3cb, c) 
and occasionally becomes very abundant and somewhat injurious. 
The midges issue the latter part of May or early in June. This 
os 
— 
oS 

a 
Fig. 30 Retinodiplosis inopis: a, swollen shoot showing two exit holes; 6, young 
shoot bearing three cocoons; ¢, Pine needle bearing one cocoon 
species approaches the pitch midge, Retinodiplosis resin- 
icola O. S., from which it may be distinguished by its larger 
size, darker color and the shorter antennal stems of the male. The 
distal three antennal segments of the females are illustrated in figure 
31. It is somewhat smaller than the western pitch midge, R. 
resinicoloides Wlms., a form easily separated by structural 
