Bucentes. 



473 



2. B. maculata Stæg. 



1849. Stæg. apud Zett. Dipt. Scand. VIII, 3212, 4 (Siphona). — B. 

 cristatus 1824, Stein, Arch. f. Naturgesch. 90, 6, 127, 1. — '^ Siphona analis 

 Meig. 1824. Syst. Beschr. IV, 157, 5, Tab. XXXVII, Fig. 24. — 1907. Kat. 

 palåarkt. Dipt. III, 381. 



Male. Somewhat similar to the preceding species, but tlie head 

 shorter and higher; jowls broader, the eyes not reaching the large 

 vibrissa. Antennæ larger, with third joint longer, five times as long 

 as second and somewhat broad, 

 reaching fully to end of epistoma. 

 Thorax grey, with three broad, 

 indistinct brownish stripes, or it 

 may be termed brownish grey 

 with two narrow grey stripes; 

 generally three, but sometimes 

 four postsutural dorsocentrals. 

 Abdomen yellowish with a broad 

 grey dorsal line and generally the 

 two last segments grey; on each 

 segment the median marginal 

 bristles are placed each on a 

 distinct brown spot, and a similar 

 pair of spots is present on second 



segment, go that in all four pairs of spots are present; the spots may 

 be more or less pronounced, but are always distinct, only on fifth 

 segment generally less distinct, and on second often confluent. Bristles 

 as in cristata, but always no bristles on second segment. 



Female. Similar; antennæ considerably smaller, third joint only 

 twice as long as second or a little more. Abdomen generally quite 

 or almost quite grey, with the same brown spots as in male. 



Length 3,7 — 4,5 mm. 



B. maculata is common in Denmark; at Copenhagen, Charlotten- 

 lund, Ordrup Krat, Ermelund, Dyrehaven, Lyngby Mose, Holte, 

 Hillerød, Nøddebo, Tisvilde, Vallerød, Sletten, Lave Skov at Hel- 

 singør; on Lolland at Nysted; in Jutland at Sønderborg, Madeskov, 

 Hejls, Nymindegab, Sæby and Frederikshavn, and on Bornholm in 

 Almindingen and at Sandvig; the dates are ^''U — ^Vg- I have taken 

 it in copala on ^^/g. It occurs in woods and fields in low herbage and 

 on flowers, often on composites and often numerously. A number of 

 my specimens is bred from an undetermined lepidopterous larva. 



Fig. 99. Head of B. maculata ^. 



