PROCEEDINGS, 1917. 55. 



DESCRIPTION OF INSTARS. 



First Instar. — The larvae when first hatched are 2 mm. -2. 5 mm in length. Head 

 and prothoracic shield shiny black. Width of head .518 mm.-. 537 mm. On each side of 

 the first thoracic segment there is a tubercle bearing black hairs. The second and third 

 thoracic segments each have a transverse row of four black spots bearing fine hairs. 

 The first eight abdominal segments also have a transverse row of black spots on the 

 dorsum, the two central spots being smaller than the outer ones which are more or less 

 kidney shaped. The central spots, closer together and a little to the front of the outer 

 ones, are smallest on the fifth and sixth segments, being almost absent on the fifth. 

 On the ninth abdominal segment the spots are coalescent showing as only two instead 

 of four. There are three lateral rows of dark spots on each segment except the first and 

 last. The true legs are black and the pro-legs have a black stripe on the inner and outer 

 surfaces the last pair having black spots at the base. General color gray to black. Dur- 

 ation of first instar eleven to fifteen days. 



Second Instar. — Length 4mm.-4.5 mm. Head and prothoracic shield black; 

 width of head .812mm-. 875mm. The first thoracic segment is black and has a tubercle 

 on each side reddish brown in color bearing a tuft of blacv hairs. There are also two 

 tubercles on the dorsal surface of this segment each bearing black and wnite hairs. 

 The second and third thoracic segments are white dorsally. The first, second, third and 

 fourth abdominal segments are black dorsallj bearing small tubercles or spots. The 

 fifth is white dorsally. The sixth and seventh are black with distinct reddish brown 

 tubercles on the median dorsal line. The eighth and ninth have transverse rows of 

 tubercles each bearing a tuft of hairs. The entire ventral surface is of a greenish color. 

 Tne body is very hairy; general color black. Duration of second instar seven to eleven 

 days. 



Third Instar. The larvae measure 6'mm-7mm. Head black, 1.16 mm 1.35 

 mm. in width. Prothoracic shield brown to black in color. The tubercles on each 

 side of first thoracic segment are black on top and of a yellowish orange at base. Each 

 tubercle bears a compact pencil of black hairs 1mm. in length which is surrounded by a 

 scattering of longer ones. The second thoracic segment has two distinct whitish areas 

 dorsally each bearing a tuft of whitish haks. The third segment has a whitish yellow 

 patch dorsally which merges into orange near the lateral margin. The first, second, 

 third and fourth abdominal segments each have a black area dorsally surrounded by a 

 border of orange tinged with white. From the centre of the first and second segments 

 arises a compact tuft of hairs, grayish black in color, and from the centre of the third 

 and fourth segments a similar tuft creamy white in color. The fifth segment dorsally has 

 a patch of white with orange border. The sixth and seventh segments are black dor- 

 sally with a distinct circular orange colored tubercle directly in the centre of each. The 

 eighth segment is black with a tubercle bearing a compact pencil of black hairs in the 

 centre of the dorsal surface 1mm. in length. The ninth segment is whitish gray bearing 

 scattering black hairs. Each segment has tubercles on the sides from which arise mixed 

 white and black hairs. The ventral surface is of a greenish gray color. General color 

 gray to black. Duration of third instar six to nine days. 



Fourth Instar. — Length 9mm. -10mm. Head black 1.80mm.-2.02mm. in width. 

 Prothoracic shield light orange color. The pencils on the sides of the first 

 thoracic segment are 2mm. -3mm. in length and each hair is feathered at the tip. 

 Between the two pencils are two flat tufts of hair, yellowish white in color, which 

 extend forward over the head. A broad velvety black stripe runs longitudinally over 

 the centre of the dorsum. Laterad of this black stripe there is another stripe, 

 nearly as broad, of a purplish gray color, in the centre of which is set a row of 

 orange colored tubercles, one to each segment, bearing tufts of whitish hairs, inter- 

 mingled with black ones slightly longer. Adjoining this stripe on either side is a narrow- 



