92 



Hubneria, and Apoiomyia as synonyms of Exorista, and ]>rauer and 

 Berj>cnstanini make all of them (with the exception of Apoiomyia) 

 synonyms of Parexorista, i)lacing the latter and Nemorilla as sub- 

 genera of Exorista. Aporomyia they place in a separate section, 

 Polidea, but an examination of a specimen received from them under 

 t\wn:\u\o of Aporo7)i!/iafluhia,i the species upon which Ivondani founded 

 this genus, proves that it should not be sei)arated from Exorista. 

 Blejdiaridea, Sis^^ropa, and Myxexorista they i)lace in as mauy different 

 sections, even ])utting ]^>lepharidea in two sections, once in the section 

 Masicerai and a second time in the section Phorocera. A careful 

 examination of specimens referred by these authors to these three 

 genera failed to reveal a single generic character ibr separating them 

 from each other or from tyi)ical species of Exorista. Moreover, of 

 four specimens of Exorhta eudrycv submitted to these authors by 

 Dr. Kiley, two of the si)ecimens were referied by them to Sisyropa 

 and two to Myxexorista; and of three specimeivs of Exorinta fariros- 

 trifi, two were referred by them to Sisyropa and the remaining speci- 

 men to Myxexorista. Tliese authors give Phryxe as a synonym of 

 Blepharidea. 



Our si)ecies of Exorista are as follows : 



1. Second and third segments of abdomen bearing discal as well as 



marginal raacrocha'ta3 2. 



Second and third segments destitute of discal macrochaita^. 14. 



2. With three sternopleural macrocha'tie 5. 



With only two sternoiileural macrocha'ta', male destitute of orbital 



bristles, hind tibia' outwardly ciliate, ai)ical cell open 'A. 



3. Thorax bearing four postsutural macro(;ha'ta', i)ali)i jiartly or wholly 



yellow 4. 



Thorax bearing oidy three postsutural macn'ocha'ta', scutellum black, 

 hairs of abdomen short, depressed, middle tibiu- each bearing a 

 single nuicrocha'ta on the front side near the middle; i)alpi yel- 

 low, front in the male one-half, in the female iive-sixths, as wide 

 as either eye, third joint of antenna- three and one-half times as 

 long as the second; length, G to 9 mm. Franconia, N. II.; 

 Philadelphia, Pa., and northern Illinois. (Canadian Entomolo- 

 gist, Vol. XIX, p. 102 ; Sept., 1 887.) hlanda O. S. 



4. Scutellum j'ellow, hairs of abdomeu rather long and suberect, mid- 



dle tibia' each bearing two or more macrochietai on the front side 

 near the middle, front in the male one-half, in the female five- 

 sixths, as wide as either eye, third joint of antenna' two and one- 

 half times as long as the second ; length, 8 to 10 mm. Eranconia, 

 N. II., Michigan, Tennessee, Georgia, California, and Austria. 

 A female specimen from the Schiner collection, received from 

 Brauer and P>ergenstamm under the name of Parc.rorista che- 

 loniw Rond. (J)ii)t. Italica' Prod., Vol. Ill, p. 120; IB.")!). 

 Sisyropa sp., Brauer and liergenstainm in litt.). . .clidoniw Pond. 



