SYNOPSIS OF NORTH AMERICAN SYRPHID^. 103 



rax entire, yellow; dorsum black, but little shining, with three olivaceous 

 stripes, separated by about their own width ; pleurae shining black, an 

 elongate spot on the mesopleurne, and an oval one below it, yellowish. 

 Scutelluui black, with a narrow yellow border. Abdomen yellowish 

 red, or reddish yellow, with a bright golden-yellow metallic reflection ; 

 first segment more brownish. Legs reddish yellow; front femora 

 with a small black spot above near the base ; mkldle femora with a 

 larger spot in the same place, and the last two joints of the tarsi black ; 

 hind femora with two incomplete black rings, one basal and one preap- 

 ical ; hind tibiae also with two narrow black rings; hind metatarsi 

 brownish, and the last two joints of tarsi black ; hind femora thickened. 

 Wings lightly tinged with dark ; third vein gently sinuate. 



$ . Front shining black, narrowly yellow on the sides. Abdomen 

 yellowish red, but little shining ; the first segment on the sides, a small 

 spot in the middle of the second segment behind, and a minute one on 

 each of the following segments, all sometimes ol)solete, black ; second, 

 third, and fourth segments with narrow hind margins, and the fifth 

 segment wholly, shining metallic golden, as in the male. Front much 

 narrowed above; face with a broad median black stripe. 



Four specimens (two S and two 2 ), San Domingo (G. F. Frazar). 



Mescgrapta Boscii. 



Sijrpluis Boscii Mucquart, Dipt Esot.,ii, i, lUU, 23; i)l. xvii, fig. 2. 

 Sijiyhus Gurges Walker, Dipt. Saunders, 2oii (Osten Sacken). 



Habitat. — Carolina (Macq.), Alabama, Florida (O. S.). 



9 . Length, 5""". Thorace nigro, lateribus flavis ; scutello nigro, rufo- 

 inarginato. Abdomine rufo, nigro variegato. Femoribus posticis annulo 

 fusco. Face courte, proeminente, jaune; c6t6s a duvet blanchatre. 

 Front d'un noir bleuatre luisant, bord6 de fauve. Antennes fauves. 

 Abdomen ovalaire alonge: premier segment noir; deuxieme a moiti6 

 anterieure fauve, posterieure noire; troisieme et quatrieme fauves, ^ 

 bande dorsale noire, renflee, arrondie vers le bord anterieur et divis6e 

 par une ligne fauve, elargie au bord posterieur; ce bord noir, emettant 

 deux rameaux triangulaires de chaque cote; cinquieme fauve, ii trois 

 lignes noires, longitudinales. Pieds jaunes; cuisses posterieures a an- 

 neau brun pres de I'extremite; jambes posterieures '<i deux anneaux 

 brunatres pen distincts. Ailes un pen jannatres; cellule basilaire ex- 

 terne s'etendant jusqu'au tiers de la discoidale. — Macquart. 



Thorax black, the sides yellow ; scutellum black, margined with 

 yellow. Abdomen red, variegated with black. Hind femora with a 

 brown ring. Face short, prominent, yellow; the sides white <lusted. 

 Front shining bluish black, yellow on the sides. Antennae luteous. 

 Abdomen elongate oval; first segment black; second on the anterior 

 half luteous, posterior half black; third and fourth luteous, with a 

 black stripe, dilated, rounded near the front l)order and divided by a 

 luteous line, enlarged at the hind border, the hind border black, emit- 



