548 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
KEY TO THE LARVAE OF SOME OF THE MORE IMPORTANT SPECIES OF SAWFLIES 
AND HORNTAILS THAT ATTACK TREES AND SHRUBS—Continued 
23. Larvae in leaf folds. Usually solitary. May—July 
Poplar 2 So oa Pontania bozemani Cooley, p. 57 
Largetoothaspens== 2222525 Pontania populi Marl., p. 578. 
Smalltooth aspen__________- Pontania robusta Marl., p. 578. 
24. Birch; gray, paper and European white most favored—Larvae 
whitish, somewhat flattened; underside of first 4 segments with 
distinct black marks. Late in May—September_-____-___ Fenusa 
pusilla (Lep.), p. 567. 
Birch; gray, paper and European white most favored—Larvae 
whitish, somewhat flattened; head brownish; without black 
spots. Biotech mines remain quite free of excrement. July- 
Octoberz 2 eee Phyllotoma nemorata (Fall.), p. 566. 
Elm; English, Seotch, and Camperdown most favored—Larvae 
flattened, whitish, with a greenish cast; head brownish. May 
ANGI Unere sa AL, eee Fenusa ulmi (Sund.), p. 568. 
Poplar; Lombardy, and varieties—Larvae in blotch mines. May 
And: Junerse i uaa tteate Pe nce Scolioneura sp., p. 570. 
25. Willow or poplar—Larvae usually white or greenish white in galls 
OU LEa Wes iss sass ee eae ae eee | eae Pontania spp., p. 577. 
yellowish or greenish white in galls or 
woody swellings on leaf stems, twigs or shoots 
Euura spp., p. 578. 
26. Larvae in enlarged buds of willow________-__-_- Euura spp., p. 578. 
Larvae infesting aments of willow causing a premature showing of 
“cotton”; head dark brown; eye spots black, body white with 
faint gravish spots at bases of hairs. Length about % inch 
Pontania amentivora Roh., p. 578. 
27. Borers in petioles or leaf stems of maple. Larvae about ¥ inch in 
length; head brownish, body straw yellow. May and June 
Caulocampus acericaulis (MacG.), p. 571. 
Borers in shoots of willow and poplar. Larvae white, evlindrical, 
with fleshy thoracic legs: prolegs on anal segment only, and tip 
of abdomen is furnished with a short tubular prong. Length 
about %inch. Summer months__Janus abbreviatus (Say), p. 590. 
Borers in twigs of currant. Larvae similar to the above species 
Janus integer (Nort.), p. 591. 
Borers in the stems or stalks of blackberry and rose_____-_ Hartiaia 
trimaculatus (Say), p. 591. 
28. Borers in dead or weakened trees. Larvae whitish, cylindrical; 
the thoracie legs fleshy and not jointed; no abdominal legs; 
abdomens terminate in prominent short processes or prongs 
ornamented with small but distinct teeth. 
Deciduousstrees tue os as Sires Xtphydria spp., p. 586. 
Tremex columba (I..), p. 588. 
Coniférous*trees-+ 2247 aves tae ee eee Stirex spp., p. 589. 
Urocerus spp., p. 589. 
Famiry ARGIDAE 
Although the family Argidae is comprised largely of tropical in- 
sects, a considerable number of representatives are found in the east- 
ern part of the United States, and a few of them are usually common. 
Since there has been much misidentification of species in this family, 
many of the published records may be inaccurate. Little has been 
published about these species, however, and there are few records 
to show that the larvae ever become abundant enough to defoliate 
trees over extensive areas. 
The adults can be recognized by their three-segmented antennae, 
which are inserted on the front part of the head. The posterior mar- 
gin of the mesoscutellum is without a post-tergite, and the anterior 
margin is V-shaped or slightly sinuate. Ross (367) published a 
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