30 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



less pollinose, translucent when viewed from above ; the third anten- 

 na! joint is a little narrower; the parafacial hairs are all light yellow, 

 while in diaphanu there are one or two darker in male (more in fe- 

 male) ; the male paratype of awrea in the United States National 

 Museum has only one marginal macrochaeta on the second abdominal 

 segment, the right, and one discal, the left, on the third segment, indi- 

 cating an unusual instability in this character; all the specimens of 

 diaphaym have one regular discal pair on second and third and a mar- 

 ginal pair on second ; the abdomen is more shining in aurea^ a little 

 dull in dlaphana^ but possibly such old specimens have become dulled 

 by age. The genus Diaphanom.yia is barely distinct from Trwho- 

 phom in having fewer abdominal bristles, but diaphana may be left 

 liere with aurea until longer series are examined. 



The species diaphana is rather striking in appearance, with the 

 abdomen yellow except the fourth segment, which is sharply set oft' 

 by opaque black color; the legs, pleurae, humeri, and scutellum are 

 yellow. The genus resembles Copecrypta in having no palpi, rather 

 elongate proboscis; parafacial with one bristle and some hairs; 

 second antennal joint about equal to third, penultimate joint of 

 arista elongate: no ocellars, etc. It differs in the less erect apical 

 orossvein and in having discal bristles on the abdomen. 



One of the males from Brazil is retained, by courtesy of the 

 Vienna Museum, as the species was not represented in our collection. 



131. CYLINDROMYIA DORSALIS Wiedemann 



Ocifptera dorsalis Wiedemann. Auss. Zweifl., vol. 2, 1830, p. 264. 



One male, " Brasilia Coll. Winthem,"' marked type and agreeing 

 with description except in the legs. It is a typical C i/Undromym, 

 like the European and North American. The scutellum has two 

 pairs of strong lateral bristles, no apicals; the antennae are red 

 except the apical and upper part of the third joint; the legs are 

 red except the tarsi now (Wiedemann says " femora reddish, on the 

 hindmost also the tibiae, elsewhere black," but perhaps they have 

 faded in a century). The hind femur has three bristles in a close- 

 set row on the outer side below at tip, other leg bristles about as in 

 hrassicaria. Wing yellow at base, extending along costa past the 

 tip of first vein; from about the small crossvein the veins toward 

 apex and costa are heavily bordered with brownish black, which 

 fills the whole submarginal cell except its base; the petiole of the 

 third vein turns more strongly forward than in hrassicm'ia, joining 

 the costa at a right angle. The male genital segments and organs 

 are wholly red, probably somewhat faded; the genitalia are strongly 

 like those of hrojsslear'm, but the fifth sternite of the latter has two 

 projections in the middle bearing tufts of setules and separated by 



