1893.] MB. E. E. AIJSTEK ON FEW DIPTEEOUS INSECTS. 133 



Neotropical Eegion. 



Ocyptamus iris, p. 133 Jamaica. 



Baccha sagittifcra, p. 144 ,, 



„ signifera, p. 145 Brazil. 



,, levissima, p. 145 ,, 



„ incompta, p. 147 ,, 



„ piimila, p. 148 „ 



,, AvYceea, p. 140 ,, 



„ ciiltrata, p. 151 ,, 



,, flavcns, p. 153 „ 



,, gilva, p. 154: „ 



,, crocata, p. 155 „ 



„ crocea, p. 157 » 



„ fervida, p. 158 ,, 



Salpiotgogaster virgata, p. 159 ,, 



„ minor, p. 161 „ 



Bacchini, Willistou. 

 Synopsis N. Amer. Syrphidse, Bull. 31, U.S. Nat. Mus. p. xv. 



OcYPTAMUS, Macq. 

 OcYPTAiius IBIS, sp. n. (Plate IV. fig- 1, $ .) 



2 . Length 7| mm. 



Face and cJieels pale j^ellow ; face Avith a sharply defined metallic 

 bronze median stripe, reaching to the oral margin ; vertex bluish 

 purple, front metalHc greenish black, pollinose on the sides and in 

 the middle ; pile black. Antenniferous projection yellow in front, 

 below. Antennce orange-yellow, brown above ; third joint oval. 

 Thorax dull purplish black on the dorsum, steely blue on the sides 

 and pleurae ; scutellum metnllic, bluish in front, bronze-green 

 behind, uihchmen metallic iridescent, with dull velvety black 

 markings ; first segment magenta, brilliant steel-blue on the sides ; 

 second segment magenta in front, merging into purplish golden 

 behind, with a renit'orm velvety black transverse patch in the 

 middle, not reaching to the sides ; lateral margin of the segment 

 blue ; third segment a mixture of magenta and bronze, with a 

 quadrate velvety spot on each side in the middle ; fourth segment 

 somewhat darker, golden bronze in front, greenish in the midde, 

 magenta on the posterior angles, with a quadrate velvety spot on 

 each side in the middle, more widely separated one from the other 

 than the previous pair ; fifth segment prune-purple, bluish on the 

 anterior angles : the sides of the abdomen are fringed with short 

 pale hairs, the posterior angles of the fifth segment with black 

 hairs, which project backwards. Ler/s yellow ; posterior tibiae 

 browjiish on the inner side ; the last four joints of the tarsi 

 brownish. Winr/a hyaline, with a conspicuous bro\\)i blotch at 

 the tip, above the third vein ; subcostal cell pale yellowish brown ; 

 third longitudinal vein straight: alula' rudimentary. 



Cinchona, Jamaica; June: one specimen, collected and pre- 

 sented by W. l\iv\cett, lilsq. 



This species is allied to Ocyptamus {Baccha) cceruleus, Will. 



