1921] Garman: Sete of Lepidopterous Larve 147 
dorsal of the two ventral microscopic sete of the thorax disappears, 
and is lacking also on succeeding abdominal somites. 
The fourth body somite (2nd abdominal) bears a pair of microscopic 
setz in the dorsal series, the outermost vestigial; and on all following 
somites to and including the 12th body (9th abdominal) this pair is 
present, the two becoming somewhat widely separated on the 11th and 
12th: 
The larva of Tholeria reversalis has been taken in some numbers on 
several occasions from Laburnum in nurseries.in Kentucky. It is a 
particularly fine larva for the study of seta, because the bristles are 
borne on dense black, often angular, plates, and can be even more readily 
located than in the larva of Prionoxystus robinie. The same number (6) 
of macroscopic setz is present on the neck plate, with three sense pores, 
as in Noctuidz and Cosside. A microscopic seta is present at the 
posterior edge of the neck plate. The microscopic setz of the meso- and 
metathorax are as in Prionoxystus, except that the pair is mounted on a 
pinaculum on each of these somites, the plates having apparently united. 
The dorsal series of microscopic setz consists of a single seta near the 
anterior margin of somites 4 to 12 inclusive. The microscopic seta ura 
is in this larva associated on a hammer-shaped plate with the larger 
seta 11, and is to be recognized on body somites 4 to 11 inclusive. The 
presence of 11a with m1 on a pinaculum is a feature in which it agrees 
with Hepialus and certain Tortricids and differs from Prionoxystus. 
A singular dermal gland with contorted chitinous efferent tubule 
opens on each side just posterior and a trifle ventral to the dorsal 
microscopic seta, on body somites 2 to 11 inclusive. Each efferent 
tube opens by a funnel-shaped enlargement in the cuticle. One of 
these glands and tubes opens also in the neck plate, and one in the base 
of each jointed leg. These are probably glands of the same nature as 
those described by E. Verson (See Packard’s Text Book of Entomology) 
‘and said to give off oxalate of lime at an early stage, and later, uric 
acid. But it seems unlikely that special excretory organs are needed in 
this larva and not also in Noctuidae. They have not at any rate been 
observed in Chloridea. In Prionoxystus there is a small aperture 
outside seta 11a of the neck plate, that probably represents these glands. 
It is lable to be mistaken for a fourth sense pore. The glands may 
produce some defensive excretion, but the efferent ducts are suggestive 
of the nephridia of Annelids, and it may: prove that they are accessory 
renal organs as has been suggested. In the figures, the outlets of these 
glands are marked by an x. 
The large setz that have received numbers according to Dr. Dyar’s 
system are indicated by these numbers in accompanying drawings, the 
homologies being determined by comparison of the photographs with 
figures published by Mr. Carl Heinrich* and made from larve of the 
same family in each case. In my own figures the microscopic sete 
not represented by Mr. Heinrich are indicated by letters. 
* Proc. U. S. Nat. Mus., Vol. 57, pp. 53-96, 1920. 
