82 



A REVISION OF THE NEARCTIC SCIOMYZIDAE 



Originally described from Connecticut. Malloch also reports 

 it from Illinois and Wisconsin. I have two males and two fe- 

 males from Ithaca, New York, March 26 to June 20, [Cornell]. 

 Also a female from Steamboat, Nevada, September 3, (H. G. 

 Dyar), [U. S. N. M.], which is, apparently, conspecific, but the 

 wings are not mottled with l)i'own between the veins, and the 

 spines of the hind femora are fewer in number. 

 DICTYOMYIA new genus 

 Body luul wings simulating Euthi/cera arcuata while the head and antenna' 

 suggest affinities with Sepedon. 



Robust species. Eyes vertically oval. Frons flat, convex m jirofile, 

 slightly excavated before ocelli; ocellar bristles present, also two fronto- 

 orbitals. Lunule prominent. Face broad, concaved in profile with a tubercle 

 between antennae; lower median portion shining and apron-like. Cheeks 

 broad. Antennae elongate, slender; first joint distinct; second, long; arista 

 shortly and densely white plumose. Mesonotum with humeral, presutural, 

 two dorso-centrals and prescutellar bristles present. Scutellum flat with 

 four bristles. Meso- and ptero-pleura bare; sterno-pleura setulose. No 

 pro-i)leural bristle. Hind femora of male moderately spinose apically below; 

 all tibiae with preapical bristles. Wings broad, short, fuscate, with numerous 

 round white or clear spots; second, third and fourth veins, parallel. 



Genohjpe. — Tetanocera ambigua Loew. 

 Dictyomyia ambigua Loew (PI. 1, fig. 19; pi. HI, fig- 38.) 

 1S04. Tdanocera ambigua Loew, Berlin Ent. Zeit., viii, 97. 



This species has the superficial appearance of Euthycera arcuata, 

 excepting in the form of the head, which is long, and with its 

 long slender antennae suggesting species of Sepedon. However 

 it is very distinct from either but apparently is allied to Sepedon. 

 (f, 9 . The frons has the two velvety black spots as in Sepedon, first an- 

 tennal joint well exerted; second, three times as long as broad; third, three 

 times as long as second. Lunule and facial tubercle tawny or brownish, 

 latter conical. Me.sonotum, scutellum, and abdomen, ochreous pruinose, 

 with brown irrorations. Legs tawny with fore tibiae black apically, and all 

 tarsi white basally. Wings broadly infuscatcd along costa, otherwise densely 

 spotted with small round whitish si)ots. Length. — 6 nun. 



Originally described from Maine. I have seen a female from 

 Fort Kent, Maine, August 19, (C. W. Johnson), [B. S. N. H.], 

 and two males wilhout locality datum. These are seemingly 

 topical. 



I have also a female ial)eled "(V)lo. 2221" (probably C. F. 

 I'akcr), |.loliiis()ii|, wliicli may l)e a distinct species. It has the 



