THE CANADIAN ENTOMOLOGIST. 165 



Besides tlie three rows of brisileless tubercles, there are four additional 

 rows of very small tubercles : (i.) Each tubercle of the dorso-lateral row 

 may be accompanied (but often is not) by a minute brown tubercle. 

 (2.) Each tubercle of the lateral row is apparently always accompanied by 

 a tubercle behind and above it. (3.) Between the lateral row of tubercles 

 and the spiracles is a third row, while (4.) behind each spiracle is a tiny 

 tubercle. Some of these tubercles bear tiny bristles. 



The bristles of the inner dorsal row of tubercles are somewhat longer 

 than the transverse diameter of the first thoracic segment at birth, and 

 project in a curve that is upward, backward and a little outward ; the 

 bristles of the outer row are less than half the length of those of the inner 

 row, are only slightly curved, and set so as to project upward, but more 

 directly backward crossing the bristles of the inner row ; on the seventh 

 abdominal segment the bristle of the outer row is lacking. 



The substigmatal row of outwardly directed bristles unites with the 

 row of the opposite side in a continuous fringe around both cephalic and 

 caudal extremities of the caterpillar ; in length these bristles are somewhat 

 shorter than those of the outer dorsal row ; the number and relative 

 lengths of the bristles in the row apparently are constant, excepting the 

 first thoracic and last (ninth) abdominal segments. The number of bristles 

 is as follows : second and third thoracic segments four each, first to eighth 

 abdominal segments three each ; not considering the cephalic bristle on 

 the second and third thoracic segments. The relative lengths of these 

 bristles on the second thoracic to eighth abdominal, inclusive, are : 

 Middle bristle longest, caudal shortest, cephalic between these two, while 

 the cephalic bristle on the second and third thoracic is slightly shorter 

 than any of the others. 



Each half of the first thoracic segment bears nine long bristles ; these 

 are placed in two irregular rows, the four bristles in the upper row beino- 

 longer than the five of the lower row, except the most caudal one. 



Each half of the ninth abdominal segment bears seven bristles, of 

 which the uppermost dorsal bristle is longest, the others of shorter lengths. 



The bristles of the dorsal and substigmatal rows are imbricated. 



The prolegs are provided with tiny bristles. 



Two small branched spines project caudad from the last segment, 

 just below the anal opening. 



Spiracles brown, which colour is retained throughout the instars. 



The thoracic shield is triangular, base caudad, apex cephalad and 

 truncated, pale brown, clearer within. 



Length, 1.3 mm. to 1.5 mm. 



