922 CHARLES Paut ALEXANDER 
The immature stages of Hrioptera (Mesocyphona) caloptera (Say) and 
E. (M.) parva O. S. are spent in wet mud along the banks of streams 
and other bodies of water. The species discussed below as Hrioptera 
(Mesocyphona) species (near knabi), was reared from the sandy margins 
of a small prairie stream in Kansas. 
Erioptera (Mesocyphona) species (near knabi Alex.) 
Adult flies of a small species of Mesocyphona which is close to H. (M.) 
knabi Alex., of Mexico, were not uncommon along Buckner Creek, a smal 
prairie stream flowing thru Jetmore, Kansas. These adults, especiall 
the females, were photophilous, appearing in considerable numbers aroun 
lanterns which were hung in tents pitched along the banks of this stream 
A single pupa found in the muddy sand along the bank of the ereek o 
July 20, 1917, emerged as an adult on the 22d. The following genera 
characters of the species may be noted: | 
Pupa.— Labrum small, apex rather sharp. Labial lobes squarely truncated, with lateral 
angles subacute. Sheaths of maxillary palpi slender. Pronotal breathing horns moderatel 
long, cylindrical, curved slightly forward, enlarged outwardly, blunt at tips. Mesonotu 
at crest rather tumid and with a few long hairs inserted on stout black tubercles. Leg sheath 
with middle tarsi the shortest, hind tarsi the longest. 
Neanotype.— Jetmore, Hodgeman County, Kansas, July 22, 1917. 
Genus Ormosia Rondani (Gr. chain) 
1856 Ormosia Rond. Dipt. Ital. Prodr., vol. 1, p. 180. 
1860 Rhypholophus Kol. Wien. Ent. Monatschr., vol. 4, p. 393. 
1863 Dasypiera Schin. Wien. Ent. Monatschr., vol. 7, p. 221. 
Larva.— Form terete, moderately elongated. Spiracular disk squarely truncated, su 
rounded by five subequal lobes which are lined with double marks of brown. Anal gil 
blunt. Head capsule slender, very dissected, of six narrow bars, four dorsal and two ventra 
the ventral bars broader. Labrum narrow, epipharynx hairy. Mandible with teet 
moderately elongated. Antenna of the Molophilus type. Mentum without chitinize 
teeth. 
Pupa.— Cephalic crest setiferous. Pronotal breathing horns rather short and stou 
more or less flattened and with a row of tubercles along posterior margin. Mesonotu 
declivitous, at crest with a flattened, toothed, chitinized plate on either side (in O. nubil 
or with abundant setiferous tubercles. Wing sheaths ending opposite or just beyond ti 
of second abdominal segment. Leg sheaths varying in length with the different specie 
middle tarsi the shortest. Abdominal segments with a subterminal transverse row of spin 
or setae, these occurring on pleura (as small groups of eight to twelve) as well as on tergit 
and sternites. Lateral spiracles distinct, on segments 2 to 7; dorsum of segment 8 wi 
