J. R. MALLOf'H 165 



Coenosia errans n. n. 



1S97. Cocnoxia ftavipcx Stein (noc Williston, LSOG), Berl. Ent. Zeitschr., 



xi.ii, p. 2()S. 

 1913. Cociwmi steinii Johnson (nee \'errnll, 1912), Bull. Amer. AIus. Nat. 



Hist., xxxii, p. 78. 



I take this opportunity to propose a new name foi' this species, 

 the synonymy of which is in(Hcated above. 



I have before me two males, which agi'ee perfectly wilh sjieci- 

 iiKMis in our collection colkn-ted by Houjih in Cieorgia and iiaiiied 

 Jldi'ipes by him. 



LocaUties. — Chestertown, Maryland, August 12, 1901, (E. G. 

 Vanatta); Riverton, New .l(M'sey, September 8, 1901, (H. L. 

 Viereck), [all A. X. S. P.]. 



Coenosia impunctata sp. n. 



Male. — Similar to /'//'/ \\'alker. diiTering in havinji the thoraeie dorsum 

 and dorsum of abdomen unmarked, the fore femora with only a blaek stripe 

 on dorsum, the mid and hind femora with the apieal third hlaekened dor.sally, 

 and the coxae all pale. 



Structurally .similar to hitn. but tlie alxlomen is more elon<i;a1e, the hy- 

 popyjrium .smaller, and llie incision of the liflh sternit(> is shj;;lilly different. 

 Length, 2. .5 mm. 



Typc—d"; Alt. Katmai, Alaska, July, 1917, (.1. S. Hine), 

 |('oll. Hine]. Paratj/pe. — one male, to):)otypical. 



Coenosia nivea Loew var. brunnescens ^■ar. n. 



Mule. — Differs from typical iiiina in having the pruinescence much darker, 

 only the face and ch(H>ks being silvery white. Interfrontalia brown; an- 

 tennae brownish yellow; jialpi testaceous. Thorax with gray pruinescence, 

 slightly brownish on dorsum. Two basal abdominal segments testaceous 

 yellow, remainder gray. Wings not pale at ba.ses. 



Antennae shorter than in typical nivea. Thorax with an irregular series 

 of weak acrostichals. Lateral prolongations of fifth sternite as in figure 4"). 

 Length, 2.5 mm. 



Typc—d"; Swarthmore, Pennsylvania, July 22, 1900, [A. N. 

 S. P., Type no. 6230]. 



Coenosia frisoni sp. n. 



Male. — Black, subojiaque, verj^ densely pale gray pruinescent. Apex 

 of second and all of third antennal joint, and palpi yellow. Thorax very 

 indistinctly trivittate. Basal abdominal tergite and sides of second yellow; 

 fifth sternite largely yellow. Legs yellow, tarsi slightly darker. 



Head as in Jhwicoxa Stein. Body more robust than in that species, the 

 fifth sternite less deeply incised, the tibial bristles much shorter and the 

 anfero-dorsat one on mid tibia ab.sent or minute. Length, 2.5 mm. 



TRANS. .\M. |;NT. SOC, XLVI. 



