206 NEW YORK STATE MUSEUM 
iol | Can. Ent. 433034355 “Same. in (SCienee; mg3e5ge jn ecom 
Ent. Jour., 3:296; Ent. News, 22:227; N. Y. Ent. Soc. Jour., 19:200-1 
Ot NM Yen Staten ViliSam bilan 4 Zam peo2—NO4 
IgIr —————— Econ. Ent. Jour., 4:414 
tort Wheeler, W. M. N. Y. Ent. Soc. Jour., 19:201 
Prior to 1910 this species was known only through one female 
taken at Highland June 18, 1907. The interesting larvae of this 
remarkable form have subsequently been found in the decaying bark 
of maple, chestnut, oak, birch, beech and hickory at Highland, 
Tivoli, Nassau and Lake Placid, N. Y., indicating a considerable 
range for this species. The writer’s experience justifies the belief 
that these insects are rather common under bark, in the incipient . 
stages of decay. Miastor larvae have also been found in Con- 
necticut and Indiana. A variable number of pedogenetic gen- 
erations may occur in the fall and spring, the appearance of the 
adult midges being presaged by the development of a breast- 
bone in the larvae, the formation of a prepupa and pupation. An 
extended discussion of pedogenesis as observed in this species, ac- 
companied by descriptions of the larva and female, may be found in 
the writer’s report for 1910. Stages not previously characterized 
are described below. 
Prepupa. (Pl. 14, fig. 1) Length 1.75 mm. This stage is easily 
recognized by the apparent contraction and withdrawal of the 
body contents from the two extremities. The second to fifth seg- 
ments become greatly enlarged, semitransparent, and on examina- 
tion under a high power may be seen to contain the developing 
thoracic segments and their appendages. The head is much less 
prominent, being partially withdrawn into the anterior body seg- 
ments. The well-developed breastbone is frequently visible, though 
occasionally obscured and is shed with the prepupal exuvium. The 
posterior extremity is also semitransparent and in the male distinctly 
bilobed. 
Pupa. Length 1.5 mm; anterior extremity broadly rounded, 
semitransparent, the thoracic region somewhat larger, the thoracic 
horns long, slender, curved, the abdomen gradually tapering to a 
rather obtusely rounded, bilobed extremity. The posterior portion 
of the thoracic region and most of the abdomen whitish, the latter 
with a distinct orange tint in the subapical segment; terminal seg- 
ment somewhat swollen, semitransparent, bilobed. Antennal, wing 
and leg cases semitransparent, the two latter extending to about the 
second abdominal segment and all, together with the eyes, gradually 
becoming infuscated till nearly black just prior to the appearance 
of the imago. The female pupa may have a length of 2 mm, the 
abdomen being longer, slender, and when viewed by transmitted 
light may show 4 or 5 large eggs. 
