38 THE CANADIAN ENTOMOLOGIST. 



THE LARVA OF CATOCALA UNIJUGA. 



BY D. S. KELLICOTT, BUFFALO, N. Y. 



I obtained, June i6. 1880, from the trunk of a Populus candicans, at 

 Buffalo, N. Y., two larvae which proved to be those of C wiijuga. They 

 had passed their last moult when taken ; although they continued to feed 

 in confinement for five or six days they increased in size but little during 

 that time ; their habits are strictly nocturnal. When first observed they 

 were clinging to the bark beneath a limb, lying obliquely, and so flattened 

 and leech-like that, together with their gray color and lateral fringes 

 blending with the bark, they were difficult objects to discover; but for the 

 fact that the first one seen occurred on a plane with the eye they would 

 have been overlooked entirely. When disturbed they jerk themselves 

 from side to side and move off rapidly with the gait of a semi-Iooper, 

 although possessing sixteen legs. 



The larger one measured 2.2 inches, the smaller 2 inches. The body 

 is attenuated at extremities, especially anteriorly. The general color is 

 gray above, below pink with a sub-elliptical black spot to each segment, 

 those on the thoracic rings not conspicuous. The head flattened, slightly 

 bilobed, lighter in hue than the body and bordered by a well defined 

 black line. The lighter head lobes under a hand lens appear mottled and 

 reticulated with black lines and blotches. The dorsal line is white, made 

 up of patches, illy defined circles and spots alternating ; on each ring 

 on either side of the line there are two white papillae from each of which 

 arises a white hair; above the stigmata there is a white interrupted line, 

 below them a black line also interrupted. The stigmata are rather large, 

 elliptical, whitish surrounded with a black border. There is a row of 

 stout hoary filaments just above the line of the legs. No protuberances 

 appear on the dorsal aspect of any of the rings. 



June 22nd the larvag ceased to feed. On the following day they had 

 fastened together some leaves by means of a silken gauze, brownish in 

 color ; by the 26th both had transformed. The larger pupa measured 

 1.2 in. At first the thorax and abdomen are red, wing covers dusky ; 

 after a few hours the whole surface becomes densely pruinose. Under the 

 microscope the surface appears rough like Russia leather. The stout 

 thorax is quite convex above, head smooth, abdomen attenuated, its tip 

 black, bearing eight hooked hairs, the four upper, smaller, turn towards 

 the median line, the four under, larger, turn away from it ; by hooking 



