40 
Euscopolia dakotensU Townsend, 1. c, pp. 123, 124. South Dakota. 
Kribrissa amcricana l>igot, Ann. Soc. Ent. France,, p. 25B; 1888. Washington. 
Ginglymia acriro8trt8 Townsend, Trans. Amer. Ent. Soc, Vol. XIX, pp. lis, 119; 
1892. Constantine, Mich. 
Goniochata plagioides Townsend, 1. c, Vol. XVIII, pp. .Til, 352; 1891. Las duces, 
N. Mex. 
Hemithrixion a^iri forme Braner and Bergenstamm, Zweif. Kais. Mas. Wien, V, p. 357; 
1891. Colorado. 
Hesperomyia erythrocera Braner and Bergcustamm, 1. c, IV, p. Ill; 1889. Texas. 
Himanlostoma sugens Loew. Illinois. 
Hypertrophocera parvipet Townsend, Trans. Amer. Ent. Soc, Vol. XVIII, pp. 360, 361; 
1891. Las ('races, X. Mex. 
Illigeria alops Walker, belongs to Beskia; 7. corythus Walker, is Xantkomelana atri- 
pennU Say: and 7. helymits Walker, belongs to Metaohseta. 
Loewia nigrifrons, ru/wornis, and globosa Townsend, appear to he synonyms of Myio- 
phasia anea Wied. 
LophoHia setigera Thomson, belongs to Clausieella. 
Myothyria vanderindpia Townsend, belongs to Hypostena. 
Xeoiractocera anomala Townsend. Trans. Am. Ent. Soc, Vol. XIX, pp. 105, 106; 1892. 
Las duces, X'. Mex. 
Parahypoehceta heteroneura Brauei and Bergenstamm. Zweif. Kais. Mns. Wien, V, p. 
337: 1891. North America. 
Peteina stylata Braner and Bergenstamm, 1. c. pp. 386, 3S7. Greenland. 
Phasia atripennti Say. belongs to Xanthomelana. 
Podotachina americana Braner and Bergenstamm, is Tachina nulla Walker, and P. 
ribrissata of the same authors is Euphoroeera claripennls Macqnart. 
Rhinophora raJida and mexicana Townsend, Canadian Entomologist, Vol. XXIV, pp. 
167, 168; 1892. Las Cruees, X. Mex. 
SarcocJista dalcotenei* Townsend, Trans. Am. Ent. Boc, Vol. XIX, pp. 122, 123; 1892. 
South Dakota. 
Stereitiapictipes Bigot, is Xantkomelana arcuala Say. 
Trixa gillettii Townsend. belongs to Paraphyto. 
Tryphera americana and polidoides Townsend, are synonyms of Polidea areos Walker. 
Xysta didyma Loew. Illinois. 
SYSTEMATIC ARRANGEMENT OF THE GENERA. 
A linear arrangement of the genera of the Tachinidae so as to indi- 
cate their natural relationship is quite impossible, owing to the fact 
that in several cases each of three genera is more closely related to a 
fourth than to any other genus, and in a linear arrangement it is, of 
course, impossible to place each next to the one to which it is nearest 
related. The following arrangement shows the relationship of the 
genera given in the preceding table perhaps as nearly as can be done 
in a linear manner. By this arrangement, those without strong macro - 
chaetae on the abdomen are placed at the opposite end of the series to 
those having these macrochaetae the most strongly developed: 
Apical cell ending at or close to the extreme wingtip. 
Abdomen destitute of macrocha*t;e. 
Sides of the face bare. 
Proboscis shorter or only slightly longer than the head. 
Hind tibiae not cili^te: Cistogaster, Gymnosoma, Phorantha, Alophora. 
Hind tibi;e outwardly ciliate : Trichopoda. 
Proboscis longer than the head and thorax united: Eusiphona. 
Sides of face with bristly hairs: Gymnophania. 
