ART. 9 TWO-WINGED FLIES OF TEIBE MILTOGRAMMINI ALLEN 7 



12. Facial ridges usually with bristly hairs; macrochaetae if present, not extending 



on ridges above tips of antennae 13. 



Facial ridges with a row of macrochaetae extending far above tips of antennae. 



Sphenometopa Townsend. 



13. A single row of frontal bristles on either side of frontal vitta; orbital bristles 



present 14. 



Two rows of frontal bristles on either side of frontal vitta; orbital bristles 

 absent Pachyophthalmus Brauer and Bergenstamm. 



14. Distance from tip of antennae to vibrissae ec)ual to or exceeding length of 



second antennal joint; antennae extending scarcely more than halfway from 

 their base to front edge of oral margin; posterior, convex part of sterno- 

 pleuron triangular in outline; mesothoracic spiracle with both fringes of 



about equal size, the posterior one not plumose Senotainia Macquart. 



Distance from tips of antennae to vibrissae distinctly less than length of 

 second antennal joint; antennae more than two-thirds distance from their 

 base to front edge of oral margin Eumacronychia Townsend. 



DESCRIPTIONS OF GENERA AND SPECIES 

 Genus PACHYOPHTHALMUS Brauer and Bergenstamm 



Pachyophthalmus Brauer and Bergenstamm, Denkschr. Akad. Wien., 

 vol. 56, p. 117, 1889; vol. 60, p. 170, 1893. Genotype, Tachina signata 

 Meigen. — Coquillett, U. S. Bur. Ent., Tech. Ser., no. 7, p. 79, 1897. — 

 Adams, in Williston's North American Diptera, pp. 372, 373, fig. 151, 

 nos. 72, 75, 1908. — Thompson, Paris Edition du Bull. Biol, de la France 

 et de la Belgique, Recherches sur les Dipteres parasites, pp. 138-149, 1921. 



Sarcomacronychia Townsend, Trans. Amer. Ent. Soc, vol. 19, p. 100, 1892. 

 Genotype, S. unica Townsend, which equals P. floridensis Townsend, 

 according to J. M. Aldrich, who has examined both of Townsend 's types. 



The genus is represented in North America by four closely related 

 species. The adults in general appearance closely resemble Sarco- 

 pliaga adults. Other characters are as follows: 



The inner eye orbits are broadly convex, without sinuosity, some- 

 what more nearly approximated at base of antennae than at the 

 vertex, diverging rapidly to bucca; front much narrower than either 

 eye, slightly narrower in female than in male; two frontal rows on 

 either side of vitta, the inner row scarcely attaining base of antennae, 

 and not suddenly divergent below, composed of larger bristles than 

 those of outer row; no orbital bristles in either sex; vibrissae high 

 above front edge of oral margin; antennae short, extending scarcely 

 more than halfway to the oral margin; third joint less than three 

 times the second; penultimate joint of arista not more than twice as 

 long as broad; length of head at vibrissae nearly equals length at 

 base of antennae; facets of eye at extreme front very much larger 

 than those at the side; bucca and back of head beset with black 

 bristly hairs; no pale hairs present. Thorax with three broad, con- 

 spicuous black vittae; two sternopleurals, and three pairs of nearly 

 equal marginal scutellar bristles. Intermediate abdominal segments 

 marked with large, irregular blackish spots. Genitalia of male 



