173 DOLICHOPID/E. 



the following section. Lastly, B. azurens, Mq., a species pro- 

 bably allied to D. niiidus, if distinct. 



Section A A. H'md metatarsus unarmed. 



Pirst come the species (39-46) with the cilia of the lower 

 orbit pale ; the first joint of the hind tarsus (spineless except 

 beneath) not much shorter than the second ; the lamellae of the 

 male broad, generally dusky, and fringed at the tip. 



Stamiius has made a peculiar genus of those (sp. 39-42) which 

 have the face elongated, descending in front of the proboscis 

 lower than the eyes. In these the arista is glabrous, slender, 

 curved only at the thickened base, tlie penultimate joint far 

 shorter than the last ; the four exterior joints of the fore tarsus 

 compressed, and together not longer than the metatarsus, in tlie 

 males dilated, and often feathered above ; the femora rather hairy 

 beneath, the posterior, or at least the hind pair, with several 

 spines in front ; the subapical vein oblique, ending some distance 

 before the tip of the wing, and approaching very close to the 

 cubital ; its slight flexure and the discal transverse vein usually 

 shaded with brown ; the alulfe fringed with black hairs and pale 

 pubescence. The colours also are rather peculiar ; the thorax 

 being coated above, especially in front, with a yellowish dust, 

 composed of round, flat, microscopic scales; the abdomen che- 

 quered with a changeable hoary gloss, the dorsal stripe and the 

 incisures being blackish. 



39. insignis, Stn. isis, xxviii. 270. 3 (1831); Stg. ; Ztt. Mies- 

 cens, tltoracc opaco flavido-clnereo, antenyiis 7ii(jris, artkulo prbno liiteo, 

 femorlhus ajrice, tibiis, metatarsis aiitlcis tarslsque posterlorihns Jlavis, 

 geniculis liorum nujris, femoribus posticis pluri-spinosis, alis liyalinis ; 

 Mas. metatarso antico artlculls reliquis atris pennatis sesqu'dongwre, 

 hypostomate ochraceo ; Fcem. hypostomate alho. Long. 2i; alar. 4^^ lin. 



Greenish-brassy. Fi'ont with an ochreous tinge. Face oclire-yelloio 

 ill, male, yellowlsh-wJdte in female. Antennoi black, first joint latvny 

 yelloto, third somewhat ovate. Thorax opake, (jreenislt-grey , with 

 coppery streaks and ochreous dust. Wings hyaline ; in the iemale 

 darker, with the transverse vein and a dot faintly brownish ; tlie latter 

 about the middle of the subapical vein ; the transverse vein undulated. 

 Abdomen chequered. Lamellae dusky, rather oblong-obovate, with 

 long cilia ; internal appendages prominent, forceps narrow triangular ; 

 outer lobe of aculeus short and broad. Legs long and slender ; coxa) 

 and base of femora blackish-green with a hoary shade ; the tip of the 

 femora largely (the michlle pair almost entirely), the tihi(E, posterior tarsi 

 and fore metatarsus, light yellowish ; the lips of the tibia' and joints of 



