248 long's second expedition. 



'^ Length of the body nearly three-twentieths of an inch, to 

 tip of the wings more than one-fifth of an inch. 



This species is closely allied to the bimaculata Meig., with 

 which it also corresponds in the position of the stemmata and the 

 arrangement of the wing nervures, even to the dislocation of the 

 superior branch of the inferior furcate nervure. [365] 



MYCETOPHILA Meig. 



1. M. SERICEA. — Head and thorax sericeous; the latter dusky, 

 margined with yellowish. 



Inhabits North-west Territory. 



Head blackish, with a yellowish sericeous gloss ; antennae 

 fuscous, two basal joints and palpi yellowish ; thorax sericeous, 

 blackish on the disk, dull yellowish each side and on the anterior 

 edge ; wings immaculate, nervures fuscous ; poisers and feet yel- 

 lowish-white ; tarsi and spines fuscous, the latter half the length 

 of the first tarsal joint; coxae yellowish-white, with a few short, 

 black, rigid hairs on the exterior sides and tip, particularly the 

 anterior pair ; abdomen compressed, dusky above ; sides dull yel- 

 lowish on the tips of the segments. 



% 9 Length to tip of the abdomen one-fifth of an inch. 



The wing nervures are arranged as in M. fascia ta Meig., ex- 

 cepting that there are three abbreviated nervures, as in M. late- 

 ralis of the same author. 



2. M. MACULiPENNis. — Ycllowish; thorax trilineate; wings 

 three-spotted. 



Inhabits North-west Territory. 



Body pale yellowish ; vertex dusky ; thorax with a double 

 fuscous line attenuated and abbreviated behind, but near the 

 middle ', and a larger line on each side abbreviated before, con- 

 fluent behind, extending upon the scutel ; a spot of the same 

 color above the insertion of the wings ; pleura with about two 

 dusky spots, one over the insertion of each of the posterior feet ; 

 wings with three blackish spots on the costal margin, of which 

 one is on the middle ; the second much beyond the middle, obso- 

 letely extended into an undulated band ; the third is near the tip ; 

 feet [366] dusky at tip and on the posterior thighs near the 

 knees ; tergum with blackish bands. 



Length of the body nearly one-fifth of an inch. 



