61 
(B) 
(C) 
teucrii (on same wart). ? Adptilia pentad actyla (it is 
possible, but unlikely, that ii is lost). 
(3) With meso- and ineta-thoracic tubercles set transversely. 
(A) i and ii on same plate: Zeusera pyrina, Aeyeria sphcyiforinis 
(in bears two setie), A. tipulifunnis (iii bears two setie), 
1 eiehubia verhuellella. 
l and ii bases close together : My dots cribrdla (i and ii very 
close, i inner and very slightly in front of ii) ; Pterophoridac : 
/ latyptilia yonudactyla (bases touching, iii is duplicated), 
i and u bases separated and widely separated Psyehids: 
I achythdia rillosdla. Geometers : Phorodesma smaraydaria, 
beometra paptlionaria. Drepanids : Drepana unyuicula 
[cult car i a). 
My knowledge of the difference is too recent, and the species 
examined are, perhaps, too few to allow of sound generalisations, but 
a tew remarks on the subject, with the idea of getting further informa¬ 
tion or help from outside sources, may not be out of place. 
Let me first deal with the duplicate hairs of iii. This is not a 
character for which I have previously kept a look-out, and I have 
probably overlooked it in many of the species that I have examined. 
It occurs in the Hat egg races that have both types of dorsal arrange¬ 
ment, and is probably a generalised character lingering on in many 
species or groups of lepidoptera. ' 
1 he dorsal tubercles on meso- and ineta-thoracic segments, in all 
the upright egg species examined, save one, are either in transverse 
line, or consolidated. The exception, Lentmia (( rateronyj) dumi, does 
not, so tar as 1 am aware, belong to any of the four large groups that 
1 “ m we } 1 acquainted with, viz., Butterflies, Noctuids,' Notodonts 
or Arctnds (I use this term in its widest sense as including Hyntonm 
and the Liparids); and the fact of its possessing two setie on tubercle 
ni of these segments, suggests that it may very possibly be an early 
offshoot from the primitive stock which gave rise to the families 
tU i. n " ^ One large, and probably very homogeneous 
section of the Hat egg races, the Geometrids, has, I believe throughout 
the transverse arrangement, for although I have only adduced evidence 
ot two species, my memory asserts that it is the case with all the 
other geometnd larva; that 1 have seen. 
I have examined and taken notes of larvie of Teickobia verhuellella 
and Myelois cribrdla only among the large group of lepidoptera known 
as • Micros. They have their tubercles set transversely, and from Dr. 
Dyar s writings, 1 understand that this is very general throughout the 
Micro-Lepidoptera. Zcuzera pyrina and .Kycria epher/iformu have the 
two setie set transversely, l and ii being on a single plate but some 
distance apart. Dr. Dyar has figured the tubercles on meso- and 
meta-thorax of CVm«* conus, and the position of the setie is also trans¬ 
verse, but no plate is shown. I would hazard a guess that most of 
the other lepidopterous wood-borers, other than Hepialids, will be 
found to have tins or some closely similar arrangement. 
Wlth the Psyehids the thoracic segments are very greatly modified, 
he entire segments being plated over on the dorsal area, and, owin- 
to this specialisation, the character is, with this group, of doubtful 
importance, but so far as 1 have been able to determine, the arrange- 
. • v ,/v lilt 
rnent is transverse, at any rate on the true Psyehids, althom 
H' 
Inn e 
