1915. 
NATURAL SCIENCES OF PHILADELPHIA. 503 
base, the distal portion spatulate, flattened; inner pleural appendage 
with the lower or caudal arm flattened, expanded at the apex, pale 
in color and directed almost dorsad; the surface of the arm is rough- 
ened, hairy; the upper or cephalic arm is flattened, chitinized. 
Ninth sternite with the caudal margin very gently concave medially, 
the caudo-lateral angles produced into rounded knohs which are 
produced into lobes on the ventral inner face, the lobes covered 
with long yellowish hairs; the ventral surface of the sternite rather 
extensive with a deep and broad median groove. Eighth sternite 
(see Plate XVII, fig. 30) small, the caudal margin gently concave 
medially, on each side with tufts of long yellow hairs which are 
decussate. 
Habitat. — Eastern United States. 
Holotype, cf , District of Columbia. 
Allotype, 9 , Plummer's Island, Md., April 25, 1915 (AIcAtee). 
Paratype No. 1, c^, topotypic; No. 2, cf , Plummer's Island, Md., 
April. 25, 1915 (McAtee); No. 3, 2 c^'s, with the last on April 28, 
1915; No. 5, cf 9 , Maryland, near Plummer's Island, April 28, 
1915; No. 7, o^ 9 , Virginia, near Plummer's Island, April 28, 1915. 
The type is in the collection of the Museum of Comparative 
Zoology; paratypes 1, 2, 5 and 7 in the collection of the author; 
the remaining paratypes and the allotype in the collection of the 
Biological Survey. The material on which the species is "partly 
based is from the Loew-Osten Sacken collection and was probably 
taken in the vicinity of Washington by Osten Sacken. 
T. dietziana is respectfully dedicated to Dr. William G. Dietz. 
The species is closely allied to T. australis Doane and may be 
separated from that species by means of the following key : 
1. Antennae short, the flagellar segments deeply constricted beyond 
the basal enlargement; six brown stripes on the mesonotal 
praescutum; male hypopygium with the ninth tergite almost 
straight across the caudal margin with a deep and narrow 
impressed median furrow; ninth pleurite distinctiv complete; 
lobes of the caudo-lateral angles of the ninth sternite, pendu- 
lous, directed ventrad, the apex clothed with short golden 
hairs; eighth sternite with four conspicuous lobes, the outer 
pair very broad and flattened, their apex oblique; the inner 
pair of lobes are the divaricate ends of a median process on the 
caudal margin of the sternite, their apices clothed with a 
dense brush of golden yellow hair australis Doane.^ 
^australis Boane; Journal of the New York Entomological Society, vol. 9, 
