78 AMERICAN DIPTERA. 



Loew to include forms with woolly liair and curved apical spurs on 

 the middle tibite, we consider not sufficiently distinct, and allow it 

 to lapse as a synonym, in part, of Leria. The characters apply 

 mostly to the males, only with difficulty to the females, and there 

 are intermediate forms. Loew himself states that Leria iners has 

 curved spurs, and in Centuries, iii, 51 he mentions his own Leria 

 spectabilis as a Scoliocentra. 



Among other generic characters, the eyes are generally round, the 

 antennse short, with a round third joint, arista bare, either long or 

 short; one humeral bristle; one propleural ; two small pi'escutellar ; 

 scutellar bare, with the usual two pairs of bristles. 



Leria specus Aldrich is a synonym of (JEcothea fenestraiis, as we 

 find from an explanation of cotypes. 



Leria carolinensis Desv, is insufficiently described, and we fail to 

 identify it, but give a translation of the original description. 



Leria tibialis, geniculata and humeralis, all described originally 

 by Zetterstedt in northern Europe, are reported from Greenland by 

 Lundbeck and part by earlier entomologists. The species, how- 

 ever, seem to be badly confused, as in Katalog der Paliiarktischen 

 Dipteren, iv, 47, 48, Becker disposes of them as follows: tibialis he 

 makes a synonym of serrata, humeralis of insa'ipta Meig. (Euro- 

 pean), while geniculata is in part a synonym of serrata, and in part 

 of inscripta Meig., another European species. This tangle should 

 evidently be unraveled by European entomologists; for the present 

 it is hardly worth while for us to quote the descriptions, as they all 

 read much alike. 



The remaining Lerias of the 1905 Catalogue are included in the 

 following table, with the addition of helvola and fraterna, formerly 

 referred to Scoliocentra, and of glauca new species, and crassipes, 

 described as European. Specimens of all the species tabulated have 

 been examined by us except tristis and lutea ; of these we translate 

 the original descriptions. 



TABLE OF SPECIES. 



1. Mesopleura hairy at least on the lower and hind part 2. 



Mesopleura hare, at most with a few hairs close to the propleural bristle. . . -4. 



2. Mesopleura entirely hairy in the male, in the female the upper hind corner 



bare fraterna Loew. 



Mesopleura hairy only on the lower and hind part 3. 



3. Abdomen black, hind margins of the segments reddish, .puliescens Loew. 

 Abdomen black, not banded def'essa Osteu Sacken. 



