WERNER MARCHAND 167 



spines, often tipped with blackish, all but two of the long spines wanting in a 

 broad space above on seventh segment. Terminal teeth [Plate 13, Fig. 161] 

 nearly equal, tipped with blackish, their points marking the angles of a hexagon, 

 slightly wider than high. Ventral fringe of last segment not webbed together; 

 lateral tufts high — on a level with upper lateral line." 



Hine's description is shorter: 



"Pupa [Plate 11, Fig. 125] 29 mm. long; color dark, approaching fuscous; 

 prothoracic spiracle strongly bent at the middle; rima oblique and straight for 

 the outer half of its length, remainder gradually curved, with a broad hook at 

 the inner end. Teeth at the end of the abdomen [Plate 13, Fig. 161] six in num- 

 ber, nearly equidistant from one another, of nearly the same size, with the 

 extreme tips slightly turned inward." 



Tlie pupa of stygius is, according to Hine, mucli lilce tliat of sulci- 

 frons, but tliere is some difference in tlie prothoracic spiracles and in 

 the abdominal teeth. 



Tabanus sulcifrons Macquart. — A North American species inhab- 

 iting Pennsylvania, New Jersey, Ohio, Illinois, and Louisiana. 

 Closely related to Tabanus exul and abdominalis , and like the two 

 latter, appearing late in the season, in Ohio abundant in the latter 

 part of July and all of August, in Louisiana recorded from September 

 7 to October 16. 



Hine has made many interesting observations concerning the habits 

 of the adult flies of this species, but was unable to worli out its life 

 history. Although the eggs were procured in many stages of de- 

 velopment by dissecting the females, the habits of oviposition have 

 not been observed. The form of the eggs and the number produced 

 by a single female are the same as in other species of its size. Speci- 

 mens containing eggs almost fully developed were taken in various 

 places, but Hine could not get any clue as to where oviposition oc- 

 curred by dissecting the females where they were collected, as he had 

 hoped to do. 



The pupal case of the species was procured by locating a female 

 which had just emerged. The place where this pupal case was taken 

 was on a side hill, about 75 feet above the bed of a small stream. 

 The description follows: 



