.KT.12 KEYS TO SAPROMYZIDAE— MALLOCH AND McATEE. 9 



1 ,-. ,»nr.h hrnndpr than long: second wing-vein undu- 



- -^--^7^^:^^ - ne. ^-— ^ - 



^'T.TZ^...t . transverse ridge; wings not marked as above _— - 1. 



,. ..e^nlu .:;;s;tuiae continued beyond apex o. -----;-- 

 nnued to ^^^^^J^^^^^^^^-^^--;^;rmr, vein wi^ tbey 



The small black costal setuiae eou...u.. .. ^.^^^ sapromyzosoma MallochJ 



abruptly cease 



Genus LAUXANIA Latreille. 



KEY TO SPECIES. 



, T' h nf hnlteres bases of wings, and fore legs except the bases of tibiae 

 1. Knobs of halteres, bases oi » ^ cylindricornis Fabricius. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



L cylindHcomis Fabricius.-F airly numerous in Piedmont locali- 

 ties ; has been collected from April 16 to June 29. P. I. 

 Genus STEGANOLAUXANIA Frey. 



This genus is represented in our general region by one speeies 

 latipenl Coquillett. The genus was erected by Frey "^1918 and 

 is closely related to Steganop.sis de Meijere described from the Dutch 



East Indies. 



Genus LAUXANIELLA Malloch. 



Generic characfers.-Bmvs from Lauxanla in having only one 

 sternopleural bristle. In the structure of the antennae it is similar to 

 that genus and differs from other genera. 



Ge-notype. — Lauxania femomlu Loew. 



KEY TO SPECIES. 



1. Knobs of halteres yellow ; interfrontalia largely velvety black ; thoracic ^ 



dorsum not vittate ~ . 



Knobs of halteres black; interfrontalia not velvety black; thoracic ^ 



dorsum vittate Z~.~ . 2 1 i • 



Knobs of halteres whitish, a velvety black spot on each side of xnterfrontalia 

 at middle and another on outer side of orbit at middle; prescutellar 

 acrostichals present; dorsum of thorax not vittate, scutellum entirely vel- 

 vetv black; wings yellowish; tibiae and tarsi yellowish white (Texas) 



signatifrons (Coquillett). 



