14 MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
times as long as broad, somewhat expanded apically, with pale yellow hair: 
third elongate, the basal portion rounded above, annulate portion as long as or 
longer than basal portion. Clypeus and genae grayish, with yellow hair. Second 
palpal segment yellow orange, tapering to a narrow apex, with a mixture of 
coneolorous and black hair. 
Thorax yellow, middle portion of mesoscutum tinged with greenish gray, 
supraepimeron and precoxal area silvery pruinose. Wing subhyaline, with 
apex beyond end of vein R: dark brown, fading behind, base of cell Rs brown, 
fading apically, stigma and apex of cell R brown, costal cell yellow. Legs 
yellow except fore tibia and tarsus and apices of other tarsi, which are brown; 
fore tibia distinctly swollen. 
Abdomen yellow; a broad, median, dorsal stripe of yellow hair with black 
hair on each side, so that, in unrubbed specimens, a distinct pale-yellow stripe 
is evident; venter with yellow hair except at apex. 
Male.—Unknown. 
Type.—F¥emale, collection unknown, originally in “Mus. Dom. 
Bosc.” 
Type locality —‘Carolina.” 
Distribution—from Delaware to Florida and from Mexico to 
Brazil. March 29 (Paradise Key, Fla.) to November 23 (Pinellas 
County, Fla.). In the United States National Museum, 132 females. 
It is evident that Palisot de Beauvois’ 7abanus americanus 1s a 
Diachlorus and there is little reason to doubt that it is this species, 
since the figure agrees closely and it is the common species of the 
Carolinas. Rondani considered his Diabasis varipes to be possibly 
the same as Macquart’s ataenia. Since there is some doubt about this 
and since Brazil has a number of species of Déachlorus, the identity 
of varipes rust remain obscure until the type can be studied. 
Banks referred to Diachlorus ferrugatus as the “yellow fly of the 
Dismal Swamp,” since it occurs in great abundance in this and other 
swamps along the southeastern coast of the United States. Its 
approach is silent, its attack usually confined to the lower part of 
the body, and its puncture painful. It is remarkable that, in spite 
of the abundance of this fly, the male is not known. 
DIACHLORUS BADIUS Krober 
Pees badius Krober, Arch. Schiffs. u. Trop. Hyg., Bd. 32, Beihefte 2, p. 50, 
This species is unknown to the writer. It is apparently close to 
Diachlorus ferrugatus, but the characters mentioned in the key 
should serve to distinguish it. In addition it apparently differs from 
ferrugatus in having the frons somewhat wider, the basal callus 
shorter and stouter, and the apical annulus of the antenna somewhat 
longer. 
Type—F¥emale, in the Vienna Museum. 
Type locality —Georgia. 
The Genus DICLADOCERA Lutz 
Dicladocera Lutz, Inst. Oswaldo Cruz em Manguinhos, p. 29, 1909; Internatl. 
Hyg. Ausstellung Dresden 1911: 34; Enderlein, Mitt. Zool. Mus. Berlin 
11: 384-385, 1925. (Genotype, Tabanus guttipennis Wiedemann.) 
Generic characters.—Stout species of variable size; eye finely pilose; no 
ocelli or distinct ocellar tubercle; third antennal segment with five divisions, 
the first with a prominent, forward-pointing, dorsal process, 
