60 Psyche [June 
laterally, and truncate at apex; remaining portions as 
figured. 
Two males taken by the writer on Jost Van Dyke (Feb. 
18, 1944). These specimens differ from Melichar’s de- 
scription and figure only in the profile of the head. Ac- 
cording to Dr. Paul Oman, material from St. Thomas and 
St. Croix differs from the Puerto Rican A. brevifrons 
Muir in being smaller, and having the vertex more 
sharply declivous, the portion of the head in front of the 
lateral frontal carinae shorter, the costal margin of the 
tegmina more strongly curved and the anterior portion 
of the apical margin more broadly rounded. The male 
genitalia of the specimen before the writer are very close 
to those of A. impressa Mete, and Bruner. The species 
is evidently polytypic and the taxonomic relationship of 
its members might be most appropriately expressed by 
regarding brevifrons and impressa as geographical sub- 
species. 
IsSIDiE 
Thionia Stal 
Stal 1859 Berl. Ent. Zeit. 3: 321. Logotype, Issus longi- 
pennis Spinola 1839 Ann. Soc. Ent. France (1) 8: 348. 
Thionia argo sp. n. 
Male. Length, 5.8 mm. ; tegmen, 4.3 mm. Female. 
Length, 6.7 mm. ; tegmen, 5.0 mm. 
Vertex broader than long in middle line (1.5:1), 
slightly depressed, anteriorly transverse, posteriorly an- 
gulately excavate, frons very slightly longer than broad, 
median carina most prominent in basal half, four callo- 
sities on each side near margin, lateral discal carinae 
visible only near base where they curve to unite at mid- 
dle. Posttibiae bispinose. 
Fuscous ; all carinae and margins, parallel oblique striae 
on clypeus, minute speckling on frons, vertex, pro- and 
mesonotum, and sometimes a transverse bar in basal 
third of frons, and abdominal ventrites testaceous ; sides 
of head on concealed surface behind eyes and a round 
spot in each lateral field of pronotum piceous. Tegmina 
