ART. 7 AMERICAN MUSCOID FLIES IN" VIEISTNA MUSEUM ALDRICH 5 



agrees with Wiedemann's description in regard to the peculiar seal- 

 brown median abdominal stripe, so I do not doubt that this is the 

 type of the species. It does not belong to Pachygraphia (type virgata 

 Wiedemann) already mentioned, but being in poor condition I will 

 not attempt to establish a new genus upon this specimen. The best 

 that I can do is to mention characters sufficient to identify the species 

 when new material is obtained. 



It is a rather slender, gray fly, nearly 6 mm. long, with a very 

 striking seal-brown stripe on the last three abdominal segments, 

 occupying about one-third of their width. Apparently a similar 

 stripe exists on the thorax, since I can make it out on the scutellum 

 and just before. The remainder of the abdomen is densely yellowish 

 pollinose above; no median marginals on first and second segments; 

 if any are present on the latter they must be very small ; third with 

 a marginal row of 6; the fourth has a marginal row of 6; and the 

 fifth has a marginal row of the same number, but no discals what- 

 ever. In the specimen the abdomen is rather flattened and has a 

 sharp margin on each side which seems to be correlated with the 

 color pattern but may be an individual peculiarity. There are only 

 two sternopleurals ; no pteropleural ; well- developed row of hypo- 

 pleural; only two pairs of scutellar. No trace of postscutellum. 

 The wings narrow, third vein with two minute hairs at base ; fourth 

 vein with angular bend which is rather close to hind margin, ending 

 not very far before tip of wing; last section of fifth vein about one- 

 seventh of the preceding. Head considerably shriveled, the front 

 moderately narrow, apparently without ocellars; frontals extending 

 slightly beyond base of antennae; parafacial rather narrow and 

 apparently bare, the deeply shriveled facial ridges bare ; vibrissae at 

 oral margin; third antennal joint narrow, about twice the second, 

 which is swollen toward the tip; arista pollinose to the tip, its ex- 

 treme base enlarged. Palpi and proboscis rather small. Legs black, 

 middle tibia with no bristles on outer front side ; hind tibia with one 

 on outer and one on inner hind side at the middle and one above the 

 latter halfway to the base ; also one on outer flexor side below middle. 



The species is not represented in the National Museum nor in any 

 other collections that I have seen. 



83. CHAETODEMOTICUS CHILENSIS Schiner 



Demoticus cMtensis Schiner, Novara, 1868, p. 324. 



Chaetodemoticus cMlensis Brauer and Bergenstamm, Denk. Wien. Akad. 

 Wiss., vol. 58, 1891, p. 385 ; vol. 60, 1893, p. 140. 



One male, " Novara — R. Chili," labeled as type of species, which 

 is the type of the genus. Eyes bare, front broad, 0.42 of the head 

 width at vertex, which is not much narrower than the space between 

 the eyes at the vibrissae; two large verticals, the inner especially 

 strong; ocellars stout, divergent and reclinate; frontals about 11, 



