REPORT OF THE STATE ENTOMOLOGIST IQI2 225 
The colony we discovered was practically free from natural 
enemies, since only one Lestodiplosis larva was observed in the 
material collected and no adults reared. 
Egg. Length .4 mm, diameter .o8 mm, extremities rounded. The 
egg is white and granular. 
Mother larva. Length 2.5 mm, moderately stout, tapering toward 
each extremity, a dull yellowish white, the color harmonizing 
so closely with the decaying inner bark of elm as to be detected 
with difficulty. Head rather short, broad; the antennae short, stout, 
uniarticulate ; transverse bands of spines on the distinct body seg- 
ments rudimentary or wanting, the margins of the incisures of both 
extremities frequently rather strongly chitinized; the posterior ex- 
tremity is rather stout, bilobed, the lobes rather broadly and irreg- 
ularly rounded and with minute tubercles ; the skin is nearly smooth. 
An overwintering mother larva may contain 8 or Io practically 
fully developed young. 
Young larva. Length 1.5 mm, moderately stout, white or whitish 
transparent, the posterior extremity sometimes with a darker re- 
flection, due possibly to the black bark upon which the specimen 
was resting. Head long, triangular, the anterior third rather 
heavily chitinized, except the extreme apex; antennae moderately 
long, tapering, biarticulate; skin nearly smooth, transverse bands 
of spines, rudimentary or wanting; posterior extremity obtuse, 
bilobed, the lobes irregularly rounded and minutely tuberculate. 
Pupa. Length 1 mm, moderately stout, eyes reddish brown, the 
thorax pale yellowish; abdomen yellowish orange; thoracic horns 
long, slender; antennal cases stout, extending to the base of the 
wing pads, the wing and leg cases extending to about the third 
abdominal segment ; abdomen smooth, the fourth to ninth segments 
free and successively tapering, flexible; the posterior extremity 
broadly rounded and in the male, slightly bilobed. At the humeral 
angles there is a pair of irregularly oval, fuscous or reddish brown 
spots. 
Exuviae. Whitish transparent, the dorsum of the abdominal 
segments with irregular rows of minute, chitinous points. 
Female. Length 1.2 mm. Antennae short, very sparsely haired, 
brownish yellow ; 10-12 subsessile segments, the fifth with a length 
about one-fourth greater than its diameter, broadly pyriform, 
with a few long, stout setae subbasally and an irregular whorl of 
long, chitinous spines subapically; terminal segment reduced, nar- 
rowly oval. Palpi apparently wanting. Face fuscous yellowish; 
eyes light brown. Mesonotum dark brown, the submedian lines 
fuscous yellowish. Scutellum reddish brown, postscutellum and 
abdomen pale yellowish or reddish orange, frequently slightly fus- 
cous apically, the ovipositor fuscous yellowish. Wings long, nar- 
row; fringe long. Halteres yellowish transparent. Legs a some- 
what variable reddish yellow, the tarsi somewhat darker ; first tarsal 
