OF WASHINGTON. 1 1 7 
variation which occurs in some species of Coccinellidae and 
stated that in this family many species have the power of 
varying from the spotted to the unspotted form and to the 
melanic form, citing as an example species of Hippodamia and 
other allied genera. Many of the forms are considered good 
species by some of our writers on this family. Mr. Knab 
remarked upon the effect of temperature on the coloration of 
different forms and said that in Europe experiments have 
been made to show that the melanic form can be produced 
at will by subjecting pupae to both extremes of temperature. 
He mentioned the fact that the melanic form of Adalia bipunc- 
tata always occurs in the fall. Prof. Piper spoke of the ex- 
tensive breeding experiments carried on at Iceland Stanford 
University by Prof. Kellogg. Mr. Ulke spoke on the varia- 
bility of Hyperaspis and Hxochomus. Mr. Schwarz stated 
that he believed all species of these genera are spotted and 
that the uniformly black ones are all variations. Mr. Webster 
noted the fact that some metallic green insects remain their 
natural color if dropped in potassium cyanide while the same 
species placed in alcohol would turn blue. 
Mr. Titus exhibited larvae and adults of a sawfly (Taxonus 
nigrosoma). One of these larvae was found by Mr. Couden 
in an apple purchased in Washington. It had made a short 
channel in one end and had evidently chosen this as a con- 
venient place in which to hibernate. This species has been 
reared by Dr. Dyar from Rumex and Polygonum and by 
Mr. Titus from sugar beet. The habit of pupating in apples 
has also been reported by Dr. Fletcher in Canada. 
Mr. Barber exhibited specimens of a curious larva, with 
slides and photographs, and presented the following note: 
ILLUSTRATIONS OF AN UNDETERMINED COLEOPTEROUS 
LARVA. 
BY H. S. BARBER. 
On May 12, 1903, during a few hours collecting at Hesperia, 
Cal., under the dry bark of a dead tree-yucca (Yucca arbor es- 
cens) the writer found a colony of queer larvae which puzzled 
him greatly. They were placed in a small tin box with some 
