NO. 1W6. RE FOR T ON J A PANESE DIPTERA—COQ UILLETT. 309 



Family TAIiANIDAE. 



SILVIUS DORSALIS, new species. 



Female: Head black, j?ray pruinose, tlie face yellow, yellowish prui- 

 uosc; frontal callosity ohloii};', leachiiij'' IVoiri tlie lowest ocellus nearly 

 to the antennae, polished brownish-black; face on each sideof tlie cen- 

 ter with apolisiied brown spot; palpi yellow^, covered with black iiairs, 

 proboscis brown, projcictinj; nearly half its lenj;th beyond the oral niar- 

 j;in; antennae yellow, the annulate portion of Ihe third joint brown, 

 becoming black at the apex, hairs of first two antennal joints and of the 

 front black. Thorax on the u])per side yellow, marked with three 

 brown, gray pruinose vittae, th(5 outer ones interrupted at the suture, 

 each one-half as wide as the median, none of them reaching the poste- 

 rior end of the mesonotum; pleura brown, marked with yellow, scutel- 

 lum and metanotum yellow. Abdomen yellow, its hairs yellow and 

 black. Legs yellow, api<;es of tarsi brown. Halteres y«'llow, the knobs 

 brown. Wings hyaline, the costal margin and apex slightly yellowish, 

 costal cell biowii, the stigma yellow. 



Length, lU mm. Three specimens (No. 709). 



Type.—^o. .".1)72, IJ.8.N.M. 



TABANUS CHRYSURUS Loew. 



Tabanus chryaiiriiH Lokw, Wiener Eiit. Monatsch., MurcL, 1S58, p. 103. 

 Seven females (No. 718). The original specimens likewise came from 

 Japan. 



TABANUS TRIGONUS, new species. 



Male and female: Head black, yellowish-gray pruinose, above the 

 antennae whit«; |»ruiiiose; front of female ta[)eiing anteriorly, at the 

 narrowest point slightly narrower than the widtii of the first antennal 

 joint at its base, the callosity ])olished black, lanceolate, the slender 

 nj)per portion extending slightly over halfway to the occiput, no trace 

 of an ocellar tubercle; antennae yellow, the first two joints brownish 

 yellow and covered with black hairs, the annulate portion of the third 

 brownish black, the tooth of this joint very large; palpi yellow, covered 

 with black hairs, pioboscis brownish black, hairs of occiput and on 

 under side of head ]>ale yellowish; ayeii bare, the upper facets in the 

 male very much larger than the lower ones. Thorax, i)leura, and scu- 

 tellum black, grayish j)! uinose, the short, sparse hairs yellow and black, 

 humeri yellow. Abdomen on the first segment black, opaijue, gray 

 pruinose, the hind margin yellow; remaining segments polished, yel- 

 lowish brown in the female, reddish yellow in the male, darkest toward 

 the apex of the abdomen, segments 2 to each bearing an opa(|ue, light 

 gray pruinose triangle in the middle, the bases of the triangles resting 

 on the posterior margins of the segments, the posterior and lateral mar- 

 gins of these segments yellowish -gray pruinose and covered with yellow 



