SYNOPSIS OF NORTH AMERICAN SYRPHID^. 121 



of tlie abdomen, more metallic shiniug. Wings hyaline, the base to 

 the humeral cross- vein, and a large quadrate spot on the middle, black- 

 ish-brown; the spot is more blackish on the stigma, brownish behind, 

 reaching to near the middle of the third posterior cell; the tip of the 

 costal cell is hyaline, and the tip of the sub-costal ;\ ellowish. Legs red- 

 dish or brownish yellow, the end of hind femora, the most of the hind 

 tibii^e, and all the tarsi, brown. 



Two male specimens from Connecticut, that apparently belong to this 

 species, have the face and front metallic green, the tubercle and a lunule 

 above the autennse, inclosing a small black spot, yellow. They are, 

 moreover, smaller, (9 to 10™"') and the brown of the wings is much less 

 intense. 



The name B. fascipennis would have priority were it not so nearly 

 identical with B. fuscipennis Say as to render its use highly objection- 

 able. 



Baccha lemur. 



Baccha lemur Osteu Sacken, Western Diptera, 331. 



if«6ito^.— California, Wyoming, New Mexico (O. S.)! 



Length, 10 to ll*"". Wings hyaline, with an incomplete cross-band 

 between the stigma aud the fourth posterior cell; abdomen with two red 

 cross-bands. Front and vertex metallic greenish black, the former (in 

 the 2) whitish pruinose along the eyes; face whitish pruinose, its 

 ground color variable, dark metallic green, with more or less brownish 

 yellow on the sides and on the facial tubercle, or entirely yellowish ; 

 autenose brown, or reddish brown, inserted on brownish yellow ground. 

 Thorax metallic greenish black, with vestiges of whitish pruinose stripes 

 anteriorly ; pleurae whitish pruinose, with white pile ; scutellum trans- 

 lucent, yellowish brown, with a metallic reflection ; halteres with yel- 

 low knobs. Abdomen black, shining, with bronze and bluish reflec- 

 tions, a broad, blood-red cross-band, slightly emarginate in the middle 

 posteriorly, at the base of the third and fourth segments ; these cross- 

 bands are slightly pruinose; the sides of the abdomen beset with white 

 pile. Legs pale yellow; hind femora and tibise usually each with a 

 brownish ring ; sometimes the legs are more brownish, especially on 

 the femora. Wings hyaline; the root before the humeral cross-vein 

 and the extreme base of the second basal cells is infuscated, costal cell 

 hyaline, but the interval between auxiliary and first veins is pale brown- 

 ish ; stigma dark brown, the corner between the costa and the end of 

 first vein yellowish ; a brown, incomplete cross-band between the first 

 and fifth veins ; it coalesces with the brown stigma, leaves hyaline the 

 extreme proximal end of the submarginal cell, covers the small cross- 

 vein and the cross- vein at the base of the discal cell, but reaches only 

 very little beyond either, and ends at the fifth vein, filling up the 

 proximal end of the fourth posterior cell. 



flafettat— Santa Monica, Cal., February 18 ; Summit Station, Sierra 



