28 Platypezidae. 



during a longer period; possibly most or all have two broods in the 

 year, and the second then seems to be the most numerous. The larva 

 of the second brood probably hibernates, thus de Meijere states 

 that the larva of infumata hibernated in this state; if the species 

 found only in autumn should have no more than one brood, they 

 should hibernate and pass all next summer as larva and pupa. — 

 De Meijere mentions that the larva of infumata formed an irregiilar 

 cocoon from material from the fungus ; one of my puparia of boletina 

 shows remnants of what may have been a cocoon; it is not improbable 

 that more species form a cocoon, but on account of its irregularity 

 and composing material it has not been observed. 



The species of Platypeza are generally seen on leaves of bushes, 

 I have taken most of my species on leaves of Acer and on Riibus; 

 they nearly always run quickly around on the leaves; the males of 

 several species are recorded to hover in the air, even rather high, 

 and Verrall mentions (p. 677) that he has been informed, that the 

 males hover in dull weather, but are on the leaves in sunshine; I 

 have never seen them hovering myself. 



Of the genus there are some fifteen palæarctic species; 7 have 

 hitherto been found in Denmark. 



Table of Species. 



1. Posterior cross- vein much more than its own length from 

 apex of postical vein; upper branch of fork long, almost 

 straiglit 7. furcata. 



— Posterior cross- vein near apex of postical vein; upper branch 



of fork shorter, strongly curved 2. 



2. Anal cell shorter than or as long as the rest of anal vein 3. 



— Anal cell longer than the rest of anal vein 5. 



3. Antennæ, legs and generally abdomen more or less red or 

 yellowish; frons in male bare 4. 



— ■ Antennæ, legs and abdomen black; frons in male with a tuft 



of hairs 3. atra. 



4. Thorax in male black, abdomen mainly blackish; abdomen 



in female grey; lower branch of fork incomplete 1. modesta. 



— Thorax in male brownish, abdomen red or mainly red and in 

 female red; lower branch of fork complete or nearly 2. ruja. 



5. Middle cross-vein before apex of mediastinal vein 6. 



- — Middle cross-vein below apex of mediastinal vein 4. fasciata. 



6. Antennæ yellow at base; legs yellow or brownish yellow; 



thorax in female greyish brown 5. holetina. 



— Antennæ black; legs mainly black; thorax in female with a 



large black, posteriorly tridentate spot -. . . 6. infumata. 



