82 ACADEMY OF NATURAL SCIENCES 



side of the disk, and extends to the lateral edge of each of the 

 three basal segments. 



Size of .S". rostrata Fab., to which it is very closely allied, but 

 it has a larger portion of black upon the tergum, the incisural 

 lines and the dorsal line being wider, and of a much more in- 

 tense color; the fourth segment also is much darker than in that 

 insect. I have a female still more like the rostrata ; the color 

 and markings of the head, thorax and scutel being similar, and 

 the fourth segment of the tergum is much tinged with yellow, 

 but still the above remark respecting the intensity of the color 

 of the sutures and dorsal lines apply to this specimen. [95] 



SICUS Meig. 



S. FENESTRATUS. — Blackish ; feet pale, thighs with a black 

 line. 



Inhabits the Middle States. 



Antennae yellowish-white ; palpi pure white ; proboscis color 

 of the antennae ; thorax piceous-black ; scutel Jbi-spinous ; wings 

 a little du.sky; feet whitish, anterior thighs dilated, with gener- 

 ally a black serrated curved line on the inner side, anterior tibia 

 and posterior thighs and tibia with a blackish line on each side, 

 a black spot generally on the first joint of the anterior coxae; 

 tergum brown, last joint black. 



Length three-twentieths of an inch. 



[This genus is Tacliydromia Meig. — Sacken.] 



EMPIS Fab. Lat. 



1. E. 5-lineata. — Body blackish-cinereous ; thorax five-lined ; 

 feet dull testaceous. 



Inliabits Missouri. 



Eyes sanguineous; front beneath the antennae cinereous; pro- 

 boscis dark-brown ; thorax with three longitudinal, hairy, brown, 

 dorsal linos, obsolete behind, and a lateral one each side ; wings 

 brown, somewhat paler at base; feet brown-testaceous; tarsi 

 black. 



Length to tip of wings nearly half an inch. 



The nervures of the wings are like those of Tacliydromia 

 nSgripcnnis Fab. 



[Belongs to Rhampliomyia Meig. — Sacken.I 



Vol. Ill 



