(^hrysogaster. 97 



Of the genus about 33 species are found in the palæarctic region, 

 of these one is described here as new ; 12 species occur in Denmark. 



Tahle of Suhgenera. 



1. Antennæ shorl, third joint rather large; eyes widely / 

 separated in both sexes ; abdomen all shining II. Liogaster. [øH 



— Antennæ short or elongated but third joint not speci- 

 ally large ; eyes touching in the male ; abdomen generally 



dull on the disc (not in C. viduata ^) 2. 



2. Antennæ with the third joint elongated (only short in 

 brevicornis); upper marginal cross-vein more or less 



recurrent 1. Orthoneura. 



— Antennæ short, third joint small; upper marginal cross- 

 vein not recurrent III. Chrysogaster. | / X^ 



I. Orthoneura Macq. 



Eyes touching in the male for a short or longer distance, the 

 facets quite above a little enlarged, but there is no dividing line. 

 Frons in the male almost flat or slightly arched. Epistoma without 

 central knob (or in foreign species with a small one, tmnescens Loew). 

 Antennæ generally with the third joint elongated, but sometimes 

 shorter or quite short {L mst. brevicornis). Abdomen dull on the disc. 

 Hind femora setulose beneath except in the females of geniculata and 

 hrevicornis. Wings with the upper marginal cross-vein more or less 

 recurrent. 



There are about 13 palæarctic species, one of which is described 

 here as new ; 5 occur in Denmark, 



Tahle of Species. 



1. Legs more or less yellow 2. 



— Legs black 4. 



2. Eyes with a dark cross-band; third antennal joint linear, 



about four times longer than broad 1 . elegans. 



— Eyes without cross-band ; third antennal joint less linear, 

 about three times longer than broad 3. 



3. Base of stigma dark, middle cross-vein thick and a little 

 infuscated ; epistoma much broader than the diameter of 

 the eye ; eye-suture in the male short, shorter than the 



frons 2. geniculata. 



— Base of stigma not dark, middle cross-vein not infuscated; 

 epistoma about as broad as the diameter of the eye; eye- 

 suture longer, about as long as the frons 3. intermedia. 



4. Third antennal joint short, roundish quadrate; upper mar- 

 ginal cross-vein slightly recurrent 4. hrevicornis. 



— Third antennal joint elongated, about twice as long as 



broad ; upper marginal cross-vein more recurrent 5. nohilis. 



7 



