CHALAIIUS. 233 



base of fore tarsi yellowish. Fem. Hypopygium short, globular, with a 

 blackish spine. 

 Not rare. (E.) 



8. ruralis, Mg. zw. iv. 22. 8(1824); Mq. ; Wlk.; Ztt. Cinereus, alis 

 subcinereis, ahdominis lateribus cano-macidatis, genubus fulvis, iarsis 

 piceis. Long. 1^-2 ; alar. 4|^-5^ Lin. 



Cinereous. Head silvery. TFbujs pale grey . Haltcres piceous, with 

 whitish bands. Abdomen loith triangular hoary spots along each side. 

 Legs black; knees tawny, tarsi piceous. 



Generally distributed. (E. S.) 



9. auctus. Fin. d. s. syrph. 61. 1. 2(1816); Mg. ; Mq. ; W^.; 



Ztt. Cinereus, alis subcinereis, abdominis lateribus cano-maculatis, 

 genubus fulvis, tarsis piceis. Long. 2 ; alar. 4^ lin. 



Cinereous. Head silvery. Wings pale grey. Hulteres ferruginous. 

 Abdomen with triangular hoary spots along each side. Legs black ; 

 knees tawny ; tarsi piceous. 



Not common. (E. S. I.) 



Genus II. CHALARUS. 



Chalarus, Wlk. e. m.ii. 269(1834). Plpunculus p., Mg. Cephalops 



p., Fin. Ateleueura, Mq. 

 Al(E vena cubitali fere recta, prcebrachiali et anali abbreviatis. 



Antennffi with the third joint oval. Wings of moderate length ; third 

 cubital vein almost straight ; prabrachial and anal veins imperfect. 

 Abdomen depressed. 



Male. Eyes parted. 



1. holosericeus, Mg. zw. iv. 34. 12 (1824); Mq.; Wlk.; Ztt. 



Niger, thoracis lateribus ahdoniineque nigro-fuscis, alis subcinereis, pe- 

 dibus fuscis ; Frcin. tarsis flavis. Long. 1 ; alar. 2 lin. 



Black, dull. Sides of the thorax and abdomen blacMsh-broicn. Wings 

 pale grey. Male. Halteres and legs brown ; knees and tarsi paler. Fem. 

 Halleres and legs yellow ; femora and tibice mostly brown. 



Not common. (E. I.) 



2. spurius, Fin. d. s. syrph. 16. 3 (1816); Mg. ; Wlk.; Ztt.— 

 velutinus, ]\I([. Niger, alis cinereis ; Foam, abdomine tarsisque nigro- 

 fuscis. Long. 1-1 T ; 'ih^i*- 2-2i lin. 



Black, dull, hairy. Wings dark grey . Fem. Wings imler. Abdomen 

 and tarsi blackish-brown. 

 Not common. (E. I.) 



3. exiguus, Hal. e.m. 1. 162 (1833). Cinereus, alis limpidis, hal- 

 teribus albis, pedibus fusco-pallidis. Long, f ; alar. 1-| lin. 



VOL.. I. 2 n 



