340 THE CANADIAN ENTOMOLOGIST 



the second third of the front ; anterior third or more of front broadly 

 yellow; antennae dark yellow, third joint small, round, with darker 

 upper edge or more; arista short, bare; face, epistoma and bucca 

 yellow, the last with narrow shining black lower edge, the dark line 

 continuing up nearly to the antenna, between the parafacial and 

 central part of face; bucca from one-fourth to one-third the eye- 

 height; palpi brown; edge of mouth black; proboscis small, blackish; 

 eyes round, bare; back of head black. Front with four or five 

 minute orbitals; ocellars minute, erect, convergent. 



Mesonotum shining 



^ black, yet with very thin, 



/^^^ ----^^Illl^^^---^ ^ delicate pruinosity, the 



L__ ^3 ^IJ^^"7::::^X^ abundant minute hairs not 



V-""'"'^ / arranged in rows, and no 



■■•••-... y^ / noticeable punctures. Chaeto- 



"'-■■/... taxy: dc. 1, hum. 1, stpl. 3^ 



Fig. 20.— Dicraeus incongruus, wing of female. pOStal. 2, SC. 2 pairs nearly 



equal, erect. Pleurae shining 

 black except upper hind part of mesopleura and the region behind 

 and just below the wing. Hal teres lemon yellow with brown 

 stem. Scutellum concolorous with mesonotum. 



Abdomen black, not very shining, with only a few hairs, 

 which are black; the male has a polished, knob-like black genital 

 segment, from which project' forward a pair of long, stout, nearly 

 straight black forceps, reaching almost to the hind coxae, very 

 characteristic. 



Coxae, trochanters, and femora black, the knees narrowly 

 yellow; hind tibiae black to tip, a little widened, not with "sense 

 organ;" fore and mid tibiae yellow to brownish, tarsi wholly yellow. 



Wings distinctly milky, veins black, the fifth paler, especially 

 its last segment; the first vein is inerely a light streak in the wing,, 

 invisible except in favourable light, at its apex the costa is broken 

 more distinctly and widely than in any other Oscinid that I know. 

 As this wide break is shown in Becker's figure of the type species,, 

 it is probably of generic importance. Venation as figured. In 

 order to determine the trustworthiness of the costal character, I 

 measured with eye-piece micrometer the distance between the tips 

 of the first and second veins, and between the second and third. 



