146 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



HEMEROMYIA NITIDA. new species. 

 Plate 6, fig. 21. 



Female. — Glossy black; bases of tarsi and apices of tibiae yellow; 

 halteres yellow; wdngs whitish, veins yellow. 



Head similar in shape to H. obscura, the frons shghtly protruding 

 and the face concave; the antennae are half hidden under the frons. 

 Frons almost twice as wide as either eye, sides slightly convergent 

 anteriorly, lower two orbital bristles directed inward, upper two 

 directed outward; antennae rather larger than in obscura, arista simi- 

 lar to that of obscura; cheeks over one-third as high as eye, the diag- 

 onal line of bristles strong and rimning much closer to eye margin 

 than in obscura; palpi very small. Mesonotum rather more strongly 

 bristled than obscura, and between the dorso-centrals there are several 

 irregular rows of short setul^ ; scutellar bristles subequal. Abdomen 

 as in obscura. Legs as in that species, but the ventral femoral bristles 

 are stronger and there is one strong bristle on the hind femur at near 

 apex on the antero-ventral surface. Wings with inner cross vein at 

 httle beyond end of first vein and at middle of discal cell; outer cross 

 vein at its own length from apex of fifth and one and one-half times 

 that length from inner; sixth vein less distinct than in obscura. 



Length. — 1.5 mm. 



Type.— C&t. No. 15749, U.S.N.M. 



Locality. — Florissant, Colorado (T. D. A. Cockerell). 



The presence of discal setulse on mesonotum, the hind femoral 

 preapical bristle, and the different venation should readily separate 

 this species from obscura Coquillett. 



Genus TETHINA Haliday. 



Tethina Haliday, Ann. Nat. Hist., vol. 2, 1839, p. 188. 



This genus may be distinguished from RhicruBssa Loew by the 

 character of frons as given in the table of genera, and by the absence, 

 or partial absence, of the cross vein closing base of discal cell. I con- 

 sider that the genus properly belongs to the Ephydridse and not to the 

 Agromyzidse, though whether the species rostrata Hendel is really 

 congeneric with the other two or not, I can not say for certain. I 

 include Tethina in my paper only because it has been placed in 

 Agromyzidae by other authors. It can not belong here according to 

 my definition of the family Mielidinse, having no central frontal 

 setulse. 



SYNOPSIS or SPECIES. 



1. Face very distinctly produced in profile; proboscis elongated (fig. 28) 



rostrata Hendel. 

 Face not much produced in profile ; proboscis normal 2. 



