294 Annals Entomological Society of America [Vol. VI^ 



times a weaker anterior pair vivsible also ; surface of disk with numerous 

 irregularly arranged setulse; pleurae glossy black, with upper margin 

 rather broadly and sutures nari-owly yellow; scutellum and postnotiun 

 concolorous with disk of mesonotum, the foiTner with four bristles. 

 Abdomen shining, brownish-black, segments sometimes narrowly 

 yellow on posterior margins; last segment elongate; all segments with 

 black hairs. Legs glossy black, only in immature specimens paler on 

 knees; mid tibise with the posterior bristles indistinct. Wings clear; 

 first costal division one-half as long as second; subcostal vein indistinct 

 at apex; outer cross vein at very sUghtly beyond end of first vein, and 

 at, or nearly at, its own length from inner cross vein, second section of 

 fourth vein about as long as first vein or short of it; veins 2-3-4 diver- 

 gent, last section of fifth vein about twice as long as penultimate section. 

 Halteres yellow, knob paler. 

 Length, 2-3 mm. 



Originally described from California. Loew's specimens 

 (coronata) were from Cuba and Pennsylvania. Van der 

 Wulp obtained his specimens (jucunda) from Wisconsin. 

 Burgess described his specimens {malvce) reared from Malva 

 rotundifolia from District of Columbia; while Williston's 

 specimens, {lateralis), came from St. Vincent, West Indies. 



I have before me specimens from the following localities: 

 Algonquin, Illinois, (collection Coquillet) ; Tempe, Arizona, 

 (V. L. Wildermuth), Webster's No. 7286; White Mountains, New 

 Hampshire, (Morrison ?) ; Los Angeles, California; (Coquillett) ; 

 District of Columbia, from Solidago, (no collector's name) ; Cabin 

 John, Maryland, (Knab and Malloch) ; San Rafael, Vera Cruz, 

 (C. H. T. Townsend) ; Baracoa, Cuba, (Busck) ; Mayaguez, 

 Porto Rico, (Busck) ; and 3 specimens without locality, one 

 from aster, one from sunflowers and one from verbena. 



One of the two specimens from Cabin John, Maryland 

 (April 28, 1912) is much larger than the average, nearly 4 mm. 

 and has the orbital bristles five in number, as well as the 

 anterior hairs in line with the dorso-centrals much stronger 

 than normal, so that there may be said to be four pairs of dorso- 

 centrals. I consider, however, that it is merely an abnormal 

 specimen and not a distinct species, because in almost every 

 other respect it agrees with the typical specimens. 



I have arrived at the decision as to the synonymy of this, 

 species from a careful persual of the various descriptions, and 

 consider that it is correct'. 



I have examined specimens from C. W. Johnson's col- 

 lection from the following localities: Wollaston, Woods Holl, 



