1921] Garman: Sete of Lepidopterous Larve 149 
It is evident from an examination of these larve that Dr. Dyar’s 
numbers will some time require rearrangement so as to include in their 
appropriate places all of the setae now known to be present on the bodies 
of lepidopterous larvee. 
The microscopic setze must be considered in any complete system 
showing the chaetotaxy of our species. They are clearly a long- 
established feature of the structure of many families, and their vestigial 
character appears to denote some change in the integument of somites 
the nature of which we do not at present understand. Some or all of 
the setze appear even among the confusing development of secondary 
setze in such families as Arctiidae and Notodontide. On the larva of 
°G eD 
9 10 Wo As 13 
Fig. 5. Left side of larva of Tholeria reversalis, showing body somites 9 to 13, 
inclusive. 
Acrolophus mortipenellus (Acrolophidee) the paired sete (D. and E. of 
my Figures) of the thorax are borne by a sclerite of some size, not 
different from those bearing the large sete. The minute seta (A) of 
the neck plate is present in most of our families of moths. Seta ma 
is also generally present, though it has often been overlooked.* The 
others when sought out have proved not less constant, and once their 
location on the body is known, one can on a large number of our genera 
count with certainty on finding them when this portion of the cuticle 
is brought under the microscope. 
* It does not, however, always bear the same relation to Im even in the same 
subfamily. Thus in Tholeria reversalis it is associated with mI, but in Desmia 
iuneralis it is independent. 
