Pseiidacteon. 425 



Schmitz has remarked to me, arise some doubt, whether the present 

 species or the one considered as jasciata by Becker and Wood was 

 the real jasciata of Fallen, as the two species are rather similar, and 

 the more so as berolinensis proved to be common in Denmark, while 

 jasciata was not found here. I have, therefore, examined Fallén's 

 types, which are found in Zetterstedt's collection, and it turned out 

 that Fallén's species is the same as the one named so by Becker and 

 Wood, and it is well distinguished from berolinensis by the higher, 

 yellow and shining frons and the thickened hind metatarsi. 



12. Pseudacteon Coquillett. 



Small species. Frons not much broader tlian high, with a middle 

 furrow and with four rows of bristles; the three iipper rows consist 

 each of four bristles and are about straight, the fourth row consists 

 of only two lateral bristles, the inner bristles wanting; there is one 

 pair of supraantennal bristles which are directed downwards and as 

 large as the other bristles (fig. 125). Eyes not hairy. Antennæ with the 

 third joint oval, with a short, apical arista. Palpi normal, with bristles 

 especially on the outer half. There is, as far as I have been able to 

 see, one long, lower postocular bristle and one oral bristle. Thorax 

 with one pair of dorsocentral bristles. Scutellum with four bristles, 

 the outer smaller than the inner. Mesopleura bare. Abdomen short 

 in the male, second and sixth segments a little elongated. Hypopygium 

 small, the anal tube long, with the apical pair of hairs rather strong. 

 In the female the abdomen ends with a somewhat long, pointed and 

 strongly chitinized ovipositor (in foreign species the ovipositor may 

 be otherwise shaped). Abdomen is sparingly haired. Legs not slender; 

 they are constructed mainly as in Aphiochaeta and without single 

 bristles, the posterior tibiæ likewise with a dorsal palisade-like hair- 

 seam and posterior to it a row of fme bristles or hairs; on the middle 

 tibiæ the seam reaches only to below the middle; at the apex on the 

 posterior side of hind tibiæ an arrangement of the hairs in transverse 

 rows is discernible, and also on the posterior side of metatarsi. The 

 posterior tibiæ have apical spurs, small on hind tibiæ, longer on 

 middle tibiæ. Claws, pulvilli and empodium normal, but small. Wings 

 with costa short, and costal cilia short or moderate; mediastinal vein 

 not uniting with the subcostal vein; third vein unforked. 



The developmental stages do not seem to be known or, at all 



