PROCEEDINGS, 1917. 63 



Third Instar. — Length 7 .mm.-10 .mm. Head 1.25 mm.-1.32mm. in width; 

 color shining black. Prothoracic shield whitish yellow. The lateral tubercles on first 

 thoracic segment now bear pencils of long black hairs 5mm.-6mm. long surrounded by a 

 scattering of longer black and white hairs, projecting as before. The second and third 

 thoracic segments have a white "V" shaped area dorsally, each bearing three small 

 black markings. The first, second, third and fourth abdominal segments all have a 

 black area on the dorsum surrounded by a narrow border of white; from the centre of 

 all four arises a compact tuft of whitish hairs. From the fourth to the ninth segment 

 there is a black dorsal stripe which has a creamy white stripe on either side. A small 

 yellow circular tubercle occurs centrally on the dorsum of the sixth and seventh seg- 

 ments. The eighth segment has a tubercle bearing a compact pencil of blac'< hairs 5 

 mm. -6mm. in length. The ninth segment is whitish gray with a scattering of white 

 hairs. All segments bear lateral tubercles from which arise whitish hairs intermingled 

 with black ones. 



Duration of third instar three to five days. 



Fourth Instar. — Length 15 mm. -20 mm. Head 1.8 mm.-2.02 mm. in width; 

 color black. Prothoracic shield light orange. The pencils of long black hairs on the 

 first thoracic segment are 6 mm. -7 mm. long and quite feathery at tips. There are also 

 two flat tufts of white hairs which extend forward over the head. The markings on the 

 first and second thoracic segments dorsally are unchanged other than being more pro- 

 nounced. A broad black velvety stripe runs longitudinally along the centre of the dor- 

 sum, on either side of which there is a creamy white stripe not quite so broad. Laterally 

 again a broad slate grey stripe occurs, bearing in its centre on every segment a light 

 colored tubercle beset with scattering white hairs. Adjoining this slate grey stripe is a 

 narrower cream colored stripe which bears a similar row of tubercles. Below this at the 

 point where the legs and pro legs join the body there is another row of setigerous tubercles 

 almost colorless. The brushes or tufts on the dorsum of the four abdominal segments 

 are white in color, 2mm.-3mm. in length. The tubercles situated centrally on the dor- 

 sum of the sixth and seventh abdominal segments are bright orange in color. The pen- 

 cil of black hairs on the dorsum of the eighth abdominal segment is more compact than 

 those on the first thoracic segment and feathered at the tips, length 6 mm. -7mm. Thor- 

 acic legs and pro-legs of a creamy white color. All tubercles bear hairs to a greater of 

 less extent except those situated centrally on the dorsum of the sixth and seventh ab- 

 dominal segments, which are bare. 



Duration of fourth instar eight to ten days. 



Fifth Instar. — Length 20 mm.-27 mm. Head 2.62 mm.-2.83mm. in width, shiny 

 black. Prothoracic shield orange to red. Two flat tufts of whitish hais extend well 

 over the head. The pencils of black hairs on the sides of first thoracic segment are very 

 feathery and measure 8 mm.-9mm. in length. On the dorsum of the second and third 

 thoracic segments are small yellow and black markings from whic.o arise short yellow 

 and black hairs. The tufts or brushes on the dorsum of the first four abdominal seg- 

 ments are 3 mm.-4mm. in length and terminate in a wedge shaped point. They vary in 

 color from a dirty white to black. The velvety black stripe that runs longitudinally 

 over the dorsum is unchanged. The orange-colored tubercles in the centre of the black 

 stripe on the dorsum of sixth and seventh abdominal segments are not so bright in color. 

 The black pencil of hairs on the dorsum of the eighth abdominal segments is 8 mm. -9 

 mm. in length. The creamy white stripe that runs longitudinally on either side of the 

 dorsal black stripe is now quite yellow. The lateral stripes are unchanged in some and 

 much darker in others. The caudal margin of the ninth abdominal segment bears a 

 fringe of long black hairs, intermingled with a few shorter gray ones, projecting over the 

 anal plate. All tubercles are quite prominent and hairy. The ventral surface, thoracic 

 legs and abdominal legs are yellow. 



Duration of fifth instar eight to fourteen days. 



