366 C. R. OSTEN SACKEN'S PRODROME 



_ [First posterior cell closed incisa Wied. 



I First ])osterior cell open 3. 



J Antenna; dark 4. 



' lAntennffi light reddish or yellow 5. 



, Hind borders of abdominal segments with gray hairs rasa Loew 



Hind borders of abdominal segments with golden-yellow hairs tranquilla n. sp. 



r Wings subhyaline, with a yellow stigma pigi'a n. sp- 



■ '] Wings brownish, except the base and a space on the hind margin, which are hyaline . chrysocoma n. sp. 



Of these six sjjecios, 1 know only those described by me, and the one desciiljed by Mr. 

 Loew. The seventh species, P.fnsiformis Walker, Dipt. Saund., p. 19, I could not insert 

 in the table, on account of the insufficiency of the description. The four species described 

 below, as well as P. incisa Wield, are provided with ocelli ; P. macroglossa Westw., has 

 none. 



According to a manuscript note of Dr. LeBaron on a specunen of P. rasa Lw. Avhich I 

 have from him, the eyes of this species are immaculate. This is the only statement in my 

 possession concerning the coloration of the eyes in this genus. 



1. FEingonia rasa. 



Panff07ua rasa Loew., Centur., viii, 7. 



Antenna; blackish-brown, two basal joints reddish; hind margins of the abdominal segments beset with 

 grayish hairs; wings snb-hyaline, stigma brown. 



^ . Thora.x blackish-brown above, and with brownish hairs; gi'ay on the sides; abdomen brownish. 

 ? . Thorax blackish-gray above, with short, apprcssed, white hairs ; gray on the sides ; abdomen brownish 

 or blackish. 



Length, 10-12 mm. 



Face and front gray, with a slight yellowish tinge ; palpi reddish, beset with black hair ; 

 antennae : two basal joints and extreme base of the third dark reddish, the former beset 

 with black hair ; the remainder of the third segment dark brown. Proboscis a little longer 

 than the head. Thorax ( 3 ) dull brownish-black, with a brownish gray-pollen, forming two 

 indistinct longitudinal lines ; a side view shows, in front of the scutellum, two spots covered 

 with bluish-gray pollen; sides of the thorax and breast gray ; the dorsum is clothed with a 

 brownish, erect pubesence : its sides and the pleurje with long grayish hairs. In the ? the 

 thorax is more grayish, with a faint brownish middle line and two lateral stripes of the 

 same color ; the dorsum is clothed with short, appressed white hairs ; the pleur;>3 with long, 

 soft hairs of the same color. Scutellum brown in the middle, hind margin gray. Abdomen 

 more or less dark brown ; two basal joints often blackish in the middle, hind borders of the 

 segments paler, and beset with whitish hairs. Legs reddish-brown. Wings subhyaline, 

 stigma brownish ; distal half of the marginal cell faintly tinged with brownish ; posterior 

 cells open. 



Hab. Illinois (LeBaron); Wisconsin (Kennicott) ; Manlius, N. Y. (J. H. Comstock). 

 Two male and three female specimens. 



