XYLOPHAGUS. 33 



incumbent, parallel. Alulae small. Halteres uncovered. Abdomen 

 with 7 segments. Legs simple, bare. 



Male. Eyes almost contiguous. 



Fern. Eyes remote. Anal segments tubular. 



The species are few, and of rare occurrence. The larvae live 

 in decayed wood. The flies appear in the summer, and rest on 

 the trunks of trees, and are sluggish except in fine calm weather. 



f longer than the second : Palpi clavate . . . . 1. XYLOPHAGUS. 

 First joint of J 

 the Antennae j 



|_as long as the second : Palpi cylindrical ... 2. SUBULA. 



Genus I. XYLOPHAGUS. 



XYLOPHAGUS, Mq. i. 229 (1834). Atilm p., Sib. Empis p., Pz. 

 Rhagio p., Pz. Xylophagus p., Mg. ; Fb. ; LI. ; Ztt. 



Palpi biarticulati, clavati. Antennas subfiliformes ; articulus primus 

 secundo longior. Alarum venas 4 longitudinales, prater areolam 

 analem acutam in marginem interiorem alee descendentes. Tibiae 

 apice spinosaa. 



Body narrow, cylindrical, thinly clothed with short hairs. Colour 

 black, often partly red or yellow. Head depressed. Eyes prominent. 

 Labrum short, thick, with an obtuse tip, shorter than the labium. 

 Palpi biarticulate, clavate, longer than the labium, curved upward; 

 first joint very small ; second large, oval, pubescent. Labium short, 

 cylindrical. Antennas subfiliform, 10-jointed, porrect, approximate, 

 diverging; first joint longer than the second, cylindrical; second 

 cyathiform, short ; third and following joints forming a long almost 

 cylindrical flagellum. Scutellum semicircular. Alulas entire, very 

 small. Halteres uncovered. Abdomen rather long. Tibias armed 

 with spines at the tips. 



Male. Abdomen cylindrical. 



Fern. Abdomen obconical, with a tubular-jointed oviduct. 



1. ater, Fb. s. a. 64. 1 (1805); Mg. ; Mq. ; Zit.subulata, Pz. ! 

 fn. L. iv. 23. Niger, thorace cinereo-trivittato, alis fusco-fasciatis, 

 pedibus fulvis, femoribus posticis apice tibiis tarsisque fuscis. Long, 

 lin. 6 ; alar. 10 lin. 



Black, shining. First joint of the palpi yellow. Antennas a little 

 shorter than the thorax. Thorax with three grey stripes. An indis- 

 tinct brown band across each wing. Halteres yellow. Legs tawny ; 

 hind tibiae, hind tarsi, and tips of the hind femora brown. 



Very rare. In Mr. E. Brown's collection. (E.) 



VOL. I. 



