73 



reva), Lch. Bo^nbyliarii et Xylotoma, Mg. ; Mq. d. e. ; Ags. ; Lw. 

 Bombylica, Brm. Bombyliites, Anthracites, et Therevites, Nwm. 

 Bombylidee, Anthracidce, et TherevkI<B, Ct. ; Wtw. BomhyUarii, 

 Anthracii, et Xylotoma, Mq. d. BordbyUna, Anth'acince, et There- 

 vines, Edn. 



Caput rotundatum aut subtransversum. Frons et vertex non irapressa. 



Antemiaj 4-articulatce ; articulus quartus apicalis. Ala3 divaricatae. 



Pedes tenues. 



Body hairy, rather narrow, of moderate breadth, or broad. Head 

 subtransA'erse or rounded. Crown and fron^not impressed. Ocelli 3. 

 Antennae 3- or 4-jointed ; fourth joint apical, very short. Wings half- 

 deflexed. Halteres imcovered. Al)domen with 7 segments. Legs 

 slender. The genera may be thus divided : — 



Wiriffs 



of moderate lensth 



r short : ["remote 



Antennfe at the base< 

 long : Proboscis ( [_ 



approximate 



long : _ f long 



First joint of the auteunEe< 



I. short 



1. Thereva. 



2. Anthrax. 



3. LOMATIA. 



4. bombylius. 



5. Phthieia. 



Genus I. THEREVA. 



Theueva, LI. g. c. iv. (1809) ; Mg. ; Mq. ; Ztt. ; Lw. Musca p., L. ; 

 Gm. Nemotelus p., Dg. Tabanus p. ? Gf. Bibio p., Fb. ; Mg. 

 kl. ; Fin.; Pz. Mydas^., Lm. 



Corpus majoris vel mediae magnitu.dinis, cylindrico-conicum, sat angus- 

 tum, villosum. Color cinerascens, obscurus, pictiu'a abdominis fas- 

 ciata. Caput subti-ansversum . Oculi muli, virescentes, unicolores. 

 Ocelli 3. Proboscis occulta. Antenna? porrectte, S-articulatas, basi 

 approximatse. Ala mediocres, semidejlexcc. Abdomen obconicum. 

 Mas. Oculi contigui. 

 Foem. Ocidi remoti. 



Body cylindric-conical, of moderate or rather large size, clothed with 

 brown, tawny, or white hairs. Eyes green. Ocelli 3, on the crown. 

 Proboscis withdrawn into the peristoma when at rest. Labrum small, 

 flat, as long as the labium. Lingua small, acute, channelled above. 

 Maxillffi small, acute, somewhat shorter than the labrum. Palpi cy- 

 lindrical, one-jointed, hairy on the outside, with a knob at the tip, 

 somewhat louger than the labrum. Labium tumid beneath, chan- 

 nelled above. Antennae 5-jointed, porrect, as long as the head, 



VOL. I. L 



