103 
Dr. T. A. Chapman on Calloplirys avifi. 
well-developed hairs, nearly half as long as the long ones 
of tubercle i. These are wanting in C. avis absolutely in 
all of nearly a dozen specimens examined, except in one 
that has a hair here on the first and second abdominal 
segments, and on one or two others, 
Another hair well developed in C.ruhi, absentia C. avis, 
is one in front of the long dorsal hair (i ?) on seventh 
abdominal segment. The short hair in front of I on the 
abdominal segment is little more than half tlie size in 
C. avis that it is in C. rnhi. 
Plate XXVIII is taken from the specimen of C. avis in 
which the supra spiracular hairs (ill ?) happen in a few 
cases to be present. 
The prothoracic plate has four short hairs along the 
front margin in C. rnhi that are wanting in C. avis. This 
is in accordance with the general stronger development of 
hairs in C. ruhi. 
In the first instar there is no trace of a honey-gland. 
In the second instar (Plate XXXj less difference 
between the panoply of hairs is discoverable than in the 
first, between the two species. C. rtihi (Plate XXXI) is, 
however, rather more strongly haired. The longest hairs 
are about 0'37 mm. long in C. avis, and few reach this ; 
the corresponding figure for C. ruhi is 0‘‘i2 mm. The two 
photographs (Plates XXX and XXXI) give a not very 
unfair indication of the difference between the two, 
although it is much emphasised by accidental differences 
in preparing the specimens. 
In these photographs, as in several of the others, it is 
necessary to point out that in Plate XXXI the prothoracic 
plate is properly displayed, in Plate XXX its posterior 
margin is bent under. 
In both species there is in this instar a first indication 
of the honey-gland on seventh abdominal segment, a slight 
failure of the ordinary hairs appear, and there are three or 
four lenticles in line, marking the posterior lip of the 
opening, which I suppose is always present, though I have 
only managed so to speak to “ glimpse ” it in two or three 
specimens. Each pad of the prolegs and claspers, which 
in the first instar had two hooks, now has five—two longer 
and three shorter. 
To complete the view of these crochets it may be noted 
that in both species eleven seems to be the number of 
hooks to each pad in the third instar, eleven on one pad 
