248 DIPTERA OF AUSTRALIA., 



of anterior branch of fifth longitudinal fork ; base of latter lying 

 considerably beyond middle cross-vein, its posterior branch about 

 ^ the length of anterior. 



Rab. — Lawson, Blue Mountains, N.S.W. (Masters). January. 



237. Chironomus vespertinus, sp.n. 



(J. — Length of antennae 0.037 inch ... 0-92 millimetre. 



Expanse of wings 0-090 x 0-020 ... 2-27x0-50 



Size of body 0-085x0-015 ... 2-14x0-38 



Antennse bronzy-brown ; basal joint deep brown. Head black. 

 Palpi brownish-ochreous. Thorax black, opaque, more or less 

 hoary, with three longitudinal rows of brownish hairs ; pleurae 

 and pectus black ; scutellum dark brown, sometimes ochreous- 

 brown ; metanotum black. Halteres dusky brown, basal half of 

 the stem yellow. Abdomen about twice the length of thorax, 

 deep umber-brown or black, moderately clothed with tolerably 

 long yellowish hairs ; anal joint deep umber-brown or black, 

 narrow ; forceps ochreous or ochreous-brown. Legs entirely 

 ochreous-yellow, densely covered with long yellowish hairs. Tibial 

 spurs deep brown or black. In fore legs metatarsus about ^ 

 longer than tibia. Wings rather longer than body, pellucid, with 

 a weak brassy reflection ; costal, first and third longitudinal veins, 

 middle cross-vein, and basal portion of fourth longitudinal yel- 

 lowish, distinct. Costal and third longitudinal veins meeting 

 somewhat before apex of wing ; auxiliary vein indistinct, joining 

 costa about mid-way between origin of third and tip of first 

 longitudinal vein ; second longitudinal vein indistinct, joining 

 costa a little past tip of first longitudinal ; fourth longitudinal very 

 pale beyond middle cross-vein, slightly bent, scarcely reaching 

 margin, its tip situated at a point ^ the distance from tip of third 

 longitudinal to that of anterior branch of fifth longitudinal fork ; 

 posterior branch of the latter about f the length of anterior 

 branch. 



^«6.— National Park, near Sydney, N.S.W. (Skuse). Plentiful 

 in July. 



