June, 1898.] Dyar : New Species and Larvae of Sawflies. 
135 
lobes, scutellum black ; pleura brown above, black below, pilose. Abdomen brown, 
segments banded with blackish posteriorly, more distinctly toward base above. Legs 
brown, tibiae and tarsi paler. Wings hyaline, costa and stigma pale. One middle 
cell in hind wings. Length, 6.5 mm. 
Stage V .—Head immaculate, eye black; width, 1.1 mm. Body 
green, dorsal vessel darker; spines moderate, furcate, arranged as is 
normal for Isodyctium with three on spiracular annulet, pale except the 
terminal ones on joints 2, 3, 12 and 13 which have black limbs and 
the upper row the whole length which is touched with black at the base 
of the fork, leaving the apex and shaft pale. Feet pale, 6-12, 13. 
Stage VI .—Head 1.6 mm., green, eye narrowly black. Body faintly 
annulate, spines all pale except the black patches as before. Another 
had the limbs of the four dorsal spines black whole length. 
Stage VII. —(Ultimate.) Head slightly brownish tinted, eye black ; 
width 1.6 mm. Body smooth, green, with shining areas instead of the 
spines, indistinctly annulate. Color uniform, dorsal vessel dark. 
Single brooded, cells in the ground as usual. 
Found on the white oak ((A alba ) at Brookhaven and Bellport, 
Long Island, early in June, but probably occurs earlier in the mainland 
where the season is not retarded by cold winds as on the south shore 
of the island. Rare. 
Isodyctium murtfeldtiae, sp. ncv. 
9 . Head black, clypeus emarginate, its tip and labrum whitish. Thorax brown, a 
black spot on each lobe ; metathorax black. Mesopleura brown above, black below, 
a distinct white line behind ; metapleura shining black, lined through the middle with 
white. Abdomen mostly pale luteous, basal plates and irregular marks on some of ihe 
sutures black. Legs pale, black marks only in sutures of trochanters and coxre. 
Hind wings with one middle cell. Length, 5 5 mm. 
One 9, Miss Murtfeldt, no. 207 M. 
Larva .—Head green, eye narrowly black ; width, 1.4 mm. Body 
green, the spines distinct, well furcate (arrangement not discernible in 
the specimen, but presumably as in Isodyctium ), all the basal ones 
broadly black at the base and with blackish limbs. Food plant, black 
oak. 
Isodyctium calricolum Dyar. 
In the larvae previously described (Journ. N. Y. Ent. Soc., V, 193) 
only the upper spine on second annulet and upper two on fourth were 
furcate, the rest being reduced to single spines or cones. I have since 
found others with the spines nearly normally furcate and others perfectly 
normal, all the spines furcate except the stigmatal one of third annulet, 
