BY ARTHUR WHITK. 269 



1913. 



^mall, composed of white bristles, projecting forwards, fan- 

 like ; hack of head with black bristles. Antennse Avith basal 

 three-fourths of first joint deep black, apex aod seeoud joint 

 red, third black. Thorax didl black, with silvery tomentum 

 oil shoulders and at sides, and a little white pubescence; 

 scutellum shining black. Abdomen shining black, minutely 

 punctate, with sides and apex red, and a white spot on each 

 side of the second, third, and fourth segments posteriorly ; 

 first spgraent with a stiff spine-like bristle on either side. 

 Legs black, with black bristles; posterior tibiae with long 

 whitish pubescence beneath. Wings brown, the first posterior 

 cell widely open, but the fourth conspicuously contracted on 

 the wing margin. 



This species can be dis^tinguished from C. ptmcftdatus by 

 the red sides and apex of abdomen ; from C. rufidus by its 

 black legs ; to the other species of the genus it bears no 

 resemblance. 



Opseostlengis,* Gen. nov. 



This genus is proposed for an undescribed West Australian 

 species in the collection of Mr. G. H. Hardy. It resembles 

 Chrysopogon, but is distinguished by the antennae, which have 

 the third joint considerably broadened, and provided with a 

 short i)ointed style, by the convex face, and by the curious 

 comb-like moustache, described below. 



Face convex, the moustache arising from the middle of 

 the face (instead of the lowvr part of the face, as in Chryso- 

 pogo7i)\ the moustache composed of a single row of about 

 eighteen long, parallel, very stiiff bristles, which first project 

 slightly forwards, and then descend almost vertically, reach- 

 ing far below the face, the length of the moustache being 

 about the length of the face from the vertex to the oral 

 margin, and presenting the stiff appearance of a comb. 

 Antennae shorter than in Chrysopogon, the first and second 

 joints of almo>t equal lentjth, iht- third as long as the first 

 two together, considerably broadened, and provided with a 

 short pointed style. Thorax with a stout spine on each side, 

 as in Chrysopogo?i. Abdomen broad, and becoming gradually 

 broader towards the apex, the fifth segment being broader 

 than the second. Legs with bristles. Wings with the first 

 and fourth posterior cells wide open, the anal cell barely closed 

 on the wing margin, 



Opseostlengis iiisignis, Sp. nov. 

 Thorax, abdomen, and legs black, the latter having the 



* dipecos (TTXeyyls, face comb. 



