Beckerina. 199 



towards the end and ending long before the apex of the wing; all 

 thin veins reaching to the margin. 



Tilis genus is evidently related to Aphiochaeta, from which it 

 was separated in 1910; the specially distinguishing characters are 

 the erect supraantennal bristles and the simple hind tibiæ. The genus 

 comprises only one European species, and in all only two species, 

 viz besides umbrimargo the American species orphnephiloides Malloch; 

 this latter species Malloch evidently placed correctly in this genus 

 in spite of some deviations, it has thus four supraantennal bristles, 

 the frontal suture slightly marked, the rows of frontal bristles much 

 curved, second abdominal segment elongated and a short costal fringe. 



The developmental stages of the genus are not known. 



As remarked only one palæarctic species of the genus is known, 

 also occurring in Denmark. 



1. B. umbrimargo Beck. 



1901. Beck. Abhandl. zool. bot. Gesell. Wien, I, 65, 61, Taf. III, Fig. 45 

 (Phora). — 1908. Wood, Ent. Month. Mag. 2, XIX, 168 {Phora). - 1910. Ker- 

 tész, Cat. Dipt. VII, 415 (Aphiochaeta). — 1914. Brues, BuU. Wisc. Nat. Hist. 

 Soc. XII, 111. — 1918. Schmitz, Jaarb. Natuurh. Genootsch. Limbiirg 1917, 121. 



Male. Frons nearly twice as broad as high, black, somewhat 

 greyish and dull; the anterior row of bristles a little convex; one pair 

 of supraantennal bristles, considerably smaller than the others. An- 

 tennæ of medium size, black, the third joint roundish; arista pubescent. 

 Palpi not small, black or brownish black, with dense and strong, but 

 shortish bristles. Thorax black, a little shining, with brownish black 

 pubescence, rather distinct behind, and with one pair of dorsocentral 

 bristles. Scutellum with four equal bristles. Abdomen black, in certain 

 lights a little greyish, dull, the segments of equal length; abdomen 

 is sparingly haired with short hairs, a little longer at the hind margins, 

 especially at the hind corners of the segments. Hypopygium of medium 

 size, greyish; it is unsymmetrical, the right side prolongation long, 

 the left quite short and rounded; the prolongations bear longish 

 hairs at apex; anal tube quite short, almost not protruding, brownish 

 and hairy; the ventral plate somewhat cleft in the hind margin. 

 Legs brownish black, anterior femora more brownish and tibiæ and 

 tarsi brownish to brownish yellow. Wings rather brownish, almost 

 blackish at the anterior margin in continuation of costa; veins brown 

 or blackish brown, thin veins strong; costa reaching fuUy to the 

 middle, increasing in thickness outwards; 1 slightly longer than 2 + 3; 



