66 STUDIES IN AMERICAN EPHYDRIDAE (dIPTERA) 
Variations and Synonymy. — See notes under the generic dis- 
cussion. 
Var. atriventris Cresson 
1915. Dichaeta atriventris Cresson, Ent. News., xxvi, 68 
I doubt if this is a distinct species. The additions to the series 
of caudata, coining to hand since the publication of this form, 
reveal the tendency of some individuals to become unicolorous 
and shining on the thorax. A good series of typical specimens of 
this form may show characters not known at present, which will 
warrant specific recognition. This variety is distinguished by 
its small size, unicolorous shining black abdomen, and hyaline 
wings, which have no trace of clouding on the veins. Length. — 
3 mm. 
Holotype. — cT ; Colorado Springs, Colorado, 5915 ft. alt., 
August, (E. S. Tucker), [Kans.]. Paratype. — 1 cf ; topotypical. 
Before me are also two females; Yoseniite Valley, V, 22, 1908, 
(E. T. Cresson, Jr.), [A. N. S. P.]; which I also place here, there 
being no variation worthy of note. 
EXPLANATION OF PLATES 
Plate I 
Fig. 1—Notiphila virgata. Head in profile. X40. 
Fig. 2 — Notiphila virgata. Middle femur and tibia. X40. 
Fig. 3 — Notiphila virgata. Wing. X30. 
Fig. 4 — Notiphila macrochaeta. Hind tibia and base of tarsi. X40. 
Fig. 5 — Notiphila bispmosa. Apical segment of abdomen. X40. 
Fig. 6 — Notiphila fur cata. Apical segment of abdomen. X40. 
Plate II 
Fig. 7 — Dichaeta caudata. Head in profile. X40. 
Fig. 8 — Dichaeta caudata. Middle tibia. X40. 
Fig. 9 — Dichaeta caudata. Wing. X30. 
Fig. 10 — Dichaeta caudata. Apical segment of abdomen. X40. 
Fig. 11 — Dichaeta caudata. (var. ? brevicauda Loew .) Apical segment of ab- 
domen. X40. 
