FAM. GELECHIADZE 51 
beneath, which however is lost again in the higher forms. The terminal joint of palpi tends to be marked 
with two or sometimes three dark rings. Though very numerous the group is almost absent from India, 
and little represented in Australia, its greatest development being in North America and Europe. 
45. GENUS HELICE, CHAMBERS 
Helice, Chambers, Canad. Ent. Vol. 5, p. 187 (1873). — Type : H. fallidochrella, Chambers. 
Theisoa, Chambers, ibidem, Vol, 6, p. 75 (1874). — Type : H. constrictella, Zeller. 
Cacelice, Busck, Journ. N. York Ent. Soc. Vol. 1o, p. 93 (1902). — Type : H. ?allidochrella, Chambers. 
Characters. — Head smooth; ocelli posterior; tongue developed. Antennae 4/5, in c simple, 
basal joint elongate, without pecten. Labial palpi very long, recurved, smooth-scaled, second joint 
somewhat thickened towards apex, terminal joint longer than second, slender, acute. Maxillary palpi 
very small, filiform, appressed to tongue. Posterior tibiae rough-scaled above. Forewings with tufts of 
scales on surface; 1à furcate, 2 from angle, 3 and 4 stalked, 5 absent, 7 and 8 out of 6 or in c 8 absent, 
7 to costa, 9 sometimes out of 6, 11 from middle. Hindwings 2/3, in both sexes narrow-lanceolate, or 
in Q narrow-trapezoidal, apex produced, acute, termen sinuate, cilia 3-4; 3 and 4 stalked, 5 absent, 
in Q 6 and transverse vein absent, in c 7 absent (or rarely abnormally present). 
Remarks. — This extraordinary genus is an aberrant member of this group. The forms with 
narrow-lanceolate hindwings and those with Gelechiad hindwings were originally regarded as belonging 
to distinct genera and families, the former being referred to the Cosmofterygidae (in which however their 
neuration would be quite abnormal), and the similarity in the characteristic markings being assumed to 
be due to analogy or mimicry; but Miss Braün has now shown (Canad. Ent. Vol. 5r, p. 201, 1919) that 
the two different forms denote the sexes of fallidochrella; it therefore becomes evident that Pal/idochrella 
isa Gelechiad of which the &' has developed a hindwing of the Cosmopterygid form, and that the nearly 
allied constrictella isa more advanced type in which a similar form of wing has been transferred to the 
Q also. The explanation of these curious changes (which would have been deemed rima facie improbable 
in the highest degree) still remains to be investigated. I am indebted to Miss Braun for examples of both 
these species. 
Geographical distribution of species. — North American. 
Larva (coistrictella) feeding beneath a web on under-side of leaves. 
Foodplant U/mus. 
r. H. multifasciella, Chambers, Canad. Ent. Vol. 7, p. 93 (1875). Texas. 
2. H. constrictella, Zeller, Verh. Zool.-bot. Ges. Wien. Vol. 23, p. 291, pl. 4, Ohio, Texas. 
f. 32 (1873). — PI. lI, Fig. 16; Pl. 5, Fig. 122a, b. 
bifasciella, Chambers, Canad. Ent. Vol. 6, p. 75 (1874). 
3. H. fallidochrella, Chambers, ibidem, Vol. 5, p. 188 (1873). — Pl. b, Kentucky, Ohio. 
Fig. 1 23a, b. 
gledilschiaeella, Chambers, ibidem, Vol. 9, p. 232 (1877). 
permolestella, Busck, Journ. N. York Ent. Soc. Vol. 10, p. 93, pl. 12, f. 2 (1902). 
46. GENUS STENOLECHIA, MEYRICK 
Stenolechia, Meyrick, Ent. M. Mag. Vol. 3o, p. 23o (1894). — Type : S. gemmella, Linnaeus, 
Characters. — Head smooth; ocelli posterior; tongue developed, Antennae 4/5, in c simple, 
basal joint moderate, without pecten. Labial palpi long, recurved, second joint with appressed scales, 
