Opetia. 5 



to be present, thus herein showing affmities to Schizophora, while the 

 want of an oral cone with a free clypeus (in Callimyia) and the 

 hypopyg point towards Dolichopodidae. 



Of the family about 35 species are known from the palæarctic 

 region, and a similar number from North America. None seems to 

 be common for both regions (except two species of Microsania). 



I am acquainted with no case of Hymenoptera parasitic on 

 Platypezidae. 



Platypezids earlier recorded from Denmark: As far as I see Zetter- 

 stedt is the only author who has mentioned Platypezids from Den- 

 mark. In Dipt. Scand. III, 1844 he mentions 9 species: Callimyia 

 speciosa, amoena, Falleni, antennata and Platypeza boletina, fasciata, 

 vittata = infiimata, modesta and rafa. In the present paper 16 species 

 are enumerated. 



Table of Genera. 



1. Posterior cross-vein wanting, and tlius no closed discai 



cell; humeral and postliumeral bristles strong 2. 



— Posterior cross-vein present and thus a closed discai cell; 



no strong humeral or posthumeral bristle, often only hairs 3. 



2. Discai vein forked 1. Opetia. 



■ — • Discai vein unforked 2. Platycnema. 



3. Discai vein not forked 4. 



— Discai vein forked 5. Platypeza. 



4. Subcostal vein spinulose 3. Callimyia. 



— Subcostal vein not spinulose 4. Agatliomyia. 



The genus Microsania with the Danish species stigmaticalis Zett. 

 was treated in Dipt. Dan. III under the Empididae and is therefore 

 not treated here, but in reality it no doubt belongs to the Platypezidae., 

 as shown, besides by other characters, by the ventrally incurved hypo- 

 pygium, the dilated hind tarsi, and also the wing venation is similar. 

 Melander has (Psyche XXIX, 1922, 43) given characters for its junc- 

 tion with the Platypezidae] he thinks it related to Opetia and Platyc- 

 nema., but this latter genus belongs, I think, to the Empididae (see 

 under the genus). Microsania may be related to Opetia., but stands, 

 however, somewhat apart. 



1. Opetia Meig. 



Small, black species. Head broader than thorax, semiglobular, 

 flat behind. Eyes in male large, occupying most of the front part 



