REPORT OF THE STATE ENTOMOLOGIST IO,I2 225 



The colony we discovered was practically free from natural 

 enemies, since only one Lestodiplosis larva w r as observed in the 

 material collected and no adults reared. 



Egg. Length .4 mm, diameter .08 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 10 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 



