THE CANADIAN ENTOMOLOGIST. 75 



they are separated by a space nearly as long as one of the tubercles them- 

 selves. Those of the second pair (//) are a little wider apart, but situated 

 close to the anterior pair, and with shorter and smaller seise. The 

 presence of a second pair of tubercles on the terguni, the four tubercles 

 arranged in a short trapezoid, is a very primitive feature. I have observed 

 them in the ist stage of Cerura Heterocampa, Macrurocampa, and other 

 Notodontidse, as well as in Anisota and Adelocephala, but not in Eacles. 



The caudal horn is about as thick as the metathoracic horns, the distal 

 half fully as thick through, and the two divisions of the fork are of the 

 same size, including the terminal setse. It is also equally flexible, and its 

 armature is the same, the surface being beset with microscopic conical 

 spinules which do not end in a hair. The horn is about half as long as 

 the anterior horns, extending a little beyond the end of the dorsal sette. 



The horn is the fused homologues of the anterior pair of tubercles of 

 the abdominal segments in front, for directly behind its base is a pair of 

 short tubercles of the same size and shape as those of the posterior pair. 



The 9th abdominal segment is armed dorsally with a pair of separate 

 tubercles like, in shape and size, the anterior ones on segments 1-7, but 

 situated close together at their base. The suranal plate is triangular, about 

 as long as broad, with three small marginal tubercles on each side, and 

 one twice as large near the base of the plate. The surface is not tubercu- 

 lated. The anal legs are flat, square, not rough and tuberculated, but 

 bearing three small setiferous tubercles near the lower edge. 



The tubercles of the subdorsal 2nd row (//) are simple and digitiform, 

 as are tho?e of the third or supraspiracular row (///). These tubercles 

 arise from a broad base, forming a dark or reddish discoloration. The 

 tubercles of the lower or 4th supraspiracular row (v, vi) are on the 

 abdominal segments united at their base, those of the 2nd and 3rd thoracic 

 segments minute and single, as usual in al! Ceratocampidje. 



The setse are peculiar in the microscopic spinules being stout, 

 conical, often blunt. They are of nearly equal length, the longest one 

 bemg nearly or about two-thirds as long as the segment is thick, and 

 necessarily add very much to the defensive nature of the armature of the 

 young larva. 



The ground colour, as shown by Mr. Joutel's drawing, is a reddish 

 ochreous, the bases of the tubercles being surrounded by light reddish 

 brown ; the tubercles are all red, the middle of the big two dorsal horns 

 and of the caudal horn being yellowish. There are no longitudinal or 

 transverse stripes. 



