230 DIPTERA OF AUSTRALIA, 



A. Thorax pale with three distinct stripes. 



219. Chironomus occidentalis, sp.n. (PL xi., fig. 1.). 



^. — Length of antennae 0*042 inch ... 1*06 millimetres. 



Expanse of wings 0*240 x 0-065 ... 6*09 x 1-66 



Size of body , 0-310 x 0*047 ... 7-87 x MS 



Antennae wholly ochre-yellow. Head ochreous-brown, with 

 golden-yellow hairs. Clypeus and palpi ochreous-brown, densely 

 covered with golden-yellow pubescence, that on the former longer. 

 Thorax pale pinkish-ochreous with three longitudinal stripes of 

 light fuscous, the lateral ones starting somewhat above middle of 

 thorax, running almost to a point posteriorly and reaching hinder 

 margin, intermediate one beginning at collare, terminating some- 

 what beyond the middle, with a light brown median line sup- 

 porting a double row of short golden-yellow hairs ; a row of 

 longer hairs between the stripes ; pleurae pale pinkish-ochreous : 

 scutellum yellowish, light fuscous along base, fringed with long 

 golden-yellow hairs ; metanotum pinkish-ochreous. Hal teres pale 

 yellow. Abdomen thrice length of thorax, umbrous-brown, each 

 segment bordered posteriorly with very pale ochreous or whitish, 

 the bands narrower on each succeeding segment, lamellae of ovi- 

 positor ochre-yellow. Legs yellow ; tarsi brownish-yellow, each joint 

 slightly tipped with light fuscous (tarsal joints of fore legs and 

 those with tibiae of hind legs lost). In intermediate legs tibiae 

 exactly the length of femora and twice the length of metatarsus ; 

 metatarsus not quite twice the length of second tarsal joint, this 

 joint I longer than fourth and twice the length of fifth. Wings 

 hyaline, glabrous, costal and first two longitudinal veins brownish- 

 yellow, marginal cross-vein and portion of the second longitudinal 

 vein between that and origin of third longitudinal vein sufi'used 

 with brown. Costal and third longitudinal meeting nearly at 

 apex of wing ; auxiliary vein joining costa opposite middle of 

 posterior branch of fifth longitudinal vein; second longitudinal 



