450 C. R. OSTEN SACKEN'S PRODROME 



portion rather long, black (in some specimens the third joint is brownish). Thorax blackish- 

 gray, -with a pale yellowish pubescence and scattered black, erect pile ; no whitish lines, 

 liut a hardly perceptible vestige of a broad, longitudinal strij^e of purer gray in the middle. 

 Pleurnj dull yellowish gray. Abdomen with a whitish longitudinal stripe, running from the 

 scutellum to the eiid of the sixth segment ; it is enclosed between two blackish stripes run- 

 ning beside it ; on each side of the blackish stripe there is again a very faint whitish oue, 

 usually visible on segments four to six only ; base of the first segment blackish, but sides of 

 segments one to three reddish. Venter reddish at base, with more or less black in the 

 middle in the shape of a stripe, blackish towards the tip. Femora black, clothed with gray- 

 ish pollen, the tips pale reddish ; front tibia? black, reddish brown on their proximal half; 

 front tarsi black; four posterior tibia? reddish, except the tip, Avhich is infuscated (more so 

 on the hind than on the middle pair) ; tarsi brown. Wings hyaline, costal cell yellowish, 

 stigma yellowish. Length, 9-11 mm. 



Male. Like the female, but the thorax somewhat darker, the yellowish pubescence 

 being less apparent, and the black erect pile more so and longer ; fixce more grayish ; the 

 head, in size and outline, not very different from tliat of the female. Length, 10 mm. 



Hah. Massachusetts, Rhode Island, New Yoi'k, New Jersey, especially near the sea- 

 coast ; (Cambridge, Mass., June 28-July 15, P. R. Uhler and 0. Sackeu ; Salisbury Beach, 

 Aug. 25, in numbers, B. P. Mann). I have sixteen females and ten males. The eyes are 

 like those of T. costalis, light green, with a single purple crossband in the middle ; it 

 seems to me that this band is somewhat narrower here. 



This species has some resemblance to T. co.sfaIis Wied., but is much smaller, and less 

 3^ellow on the thorax ; face and palpi also less yellowish ; the black abdominal stripes enclos- 

 ing the whitish ones are less dark ; the white stripe between them is much less distinctly 

 marked than in T. costalis ; the hind tibia) are only slightly brownish here at the tip, while 

 in T.'costalis the tip is very distinctly and rather abruptly black. 



The males, especially, are easily told apart, the thorax of T. nigrovittatus i , being 

 blackish, that of T. costalis very distinctly yellow; in T. n'ujrovittatus $, there is, on each 

 side of segments one to three of the abdomen, an oval rufous spot, leaving a well defined, 

 broad, blackish stripe in the middle, in the middle of which the white stripe is running ; in 

 T. costalis S , the extent of the rufous on the abdomen is much more variable, and hence 

 the black stripe in the middle less constant and well defined. From T. lineola the present 

 species differs in the smaller size, parallel front, less pure whitish, more yellowish white 

 fiice, the yellowish tinge of the costal cell, etc. 



I see no objection against identifying this species with Macquart's description, except the 

 " une tache testacee en avant des ailes et sur les cDtes du bord posterieur," which I per- 

 ceive only in the male, while Macquart describes the female. Before identifying this spe- 

 cies with Macquart's I distributed specimens to several correspondents under the name of 

 T. ^jaupcr. 



25. Tabanus costalis. 



Tabantis costalis "Wietlcmnnn, Aiiss. Zw., T, p. 173, 94; (?) Bcllai-ai, Saggio, etc., I, p. 63. 



Tabanus vicariiis Walker, List, etc., I, p. 137 ; female. 



{?) Tabanus baltimorensis Macquart, Dijit. Exot., 5" Suppl., p. 34, 129. 



Female. Face yellowish Avhite, palpi j^ellow, with short and rather dense black hairs ; 

 second joint rather stout at base ; front grayish yellow, very slightly narrower anteriorly, 



