minor. 
unitaria. 
nevadaria. 
■proutaria. 
roseitacta. 
bistriaria. 
orthogram- 
ma. 
naenia. 
pectinaria. 
42 THRASYCHLORA; ANNEMORIA; CHLOROSEA; CHETEOSCELIS. By L. B. Prout. 
5. Genus: Tlirasyclilora gen. nov. 
Face large, rounded, rather prominent. Palpus in both sexes short, s 2 nooth-scaled, terminal joint very 
small, pointed. Antenna of <$ very shortly pectinate. Hindtibia with 4 spurs; in dilated, with pencil and 
terminal process. Wings densely scaled; venation about as in Racheospila ; 1st subcostal of forewing anastom¬ 
osing with costal. Hindwing bluntly angled in the middle; 1st subcostal about connate with 3rd radial. Erected 
for one species ( minor Warr., described as a Melochlora) which has been assigned to Racheospila but differs 
essentially in the structure of the head. 
T. minor Warr. (4 h). Easily recognized by the structural characters. Colouring of a Phrudocentra, but 
smaller and with broader hindwing than the pupillata- group, a pale distal margin as in the quite differently 
shaped taediata group. S. E. Peru. The Joicey collection contains a $ from Orosi, Costa Rica, which is larger 
but agrees well. 
6. Genus: Ainieiiioria Pack. 
This genus has remained a puzzle to systematists, as the genotype is in such deplorable condition that 
a proper study of it is impossible. Packard’s diagnosis is drawn up by comparison with Chlorochlamys, with 
which probably it has nothing to do, and is inadequate; in particular, the important venation of the hindwing 
-— as usual with this author — is ignored. Palpus stout, 3rd joint distinct, thick, rounded. Antenna (G) 
pectinate to near the end, the longest branches only about twice the diameter of the shaft. Hindtibia of <$ 
swollen, with 4 strong spurs. Fore wing with 1st subcostal anastomosing with costal. 
A. unitaria Pack. “Palpi pink; front red; vertex white and antennae white above; abdomen white; 
thorax and wings deep pea-green. Extreme costal edge white. A single white line crosses both wings, just 
beyond the middle; on the primaries it is straight; on the hindwings well curved. Fringe white, on the outer 
edge pinkish. Two anterior pairs of legs reddish.” Length of body 11.4 mm; of forewing 13.45 mm; expanse 
of wings almost 28 mm. Nevada, 1 The type has since lost its head, hindwings and abdomen. It occurs 
to me that it may be a Nemoria, but Mr. Pearsall, who saw the type, did not make this suggestion. A Mexican 
“unitaria ” (I)yar det.) is perhaps Cheteoscelis naenia (5 f). 
7. Genus: Chlorosea Pack. 
A genus of three closely related North American species which differ from Nemoria and Racheospila 
chiefly in that the hindtibia in both sexes has only two spurs; that of the <$ is not dilated. Palpus moderate, 
the 3rd joint in the $ not elongate. Antenna of £ shortly pectinate, of $ dentate; Hindwing with 1st median 
not stalked with 3rd radial; more white-mixed than fore wing. 
Ch. nevadaria Pack. (4 i) is a large species with no reddish colour on the hindwing, but with gay rosy 
and yellow maculation on the anterior part of the abdomen. Rocky Mountains to S. California and northward 
into the south of British Columbia and of Vancouver Island. 
Ch. proutaria Pears., from Colorado (loc. typ.) and Utah is very similar to nevadaria (4 i), but lacks the 
dorsal ornamentation of the abdomen. 
Ch. roseitacta Prout (4 i), from Arizona, is readily recognizable by the rosy markings on the abdominal mar¬ 
gin of the hindwing. Typically it is smaller than the other species, but specimens from Colorado equal them in size. 
8. Genus: Cheteoscelis Prout. 
Perhaps a derivative of Chlorosea, with which it agrees in the hindtibia! armature. Antennal pectinations 
of long. The hindwing, which is still whiter than in Chlorosea, differs essentially in venation, the costal 
anastomosing strongly with the subcostal. South-western States and Mexico. 
Ch. bistriaria Pack. (= undinaria Streck.) (4 k), the type of the genus, was founded on a q from Nevada, 
but is not rare also in Colorado and Utah, from which latter State we figure a Fore wing moderately bright 
green, with some white strigulae, the white lines strong. The larva appears from an account by Hulst (if his 
determination is correct) to be similar to those of Nemoria. On Solidago. 
Ch. orthogramma Dyar (5 f) is close to bistriaria (4 k), the forewing of a somewhat more vivid green, 
with broader and perhaps straighter lines. Mexico: Zacualpan. 
Ch. naenia Druce (5 f) is also closely related to bistriaria, but more weakly marked, thus not liable to be 
confounded with the other Mexican Cheteoscelis. Jalapa (type) and Las Vigas. 
Ch. pectinaria Grossb. is smaller than bistriaria (4 k), the $ antenna pectinate (shortly) to %, the lines 
of the forewing narrower, the hindwing more greenish, with antemedian line present and postmedian denticulate. 
Arizona. Also known from California. 
