W. G. DIETZ 
245 
Clenus GNOPHOMYIA Ostcii-SacUcMi 
(Iriophomyia Ostcn-Sackon, Proc. Acad. Xat. Sci. I’liila., ISof), p. 223; Moii. 
A. Dipt., IV, j). 172, 
Gnophomyia tristissima ( i.sten-Saokcn, Proc. .\ca(l. Nat. Sci. I’liila., ISf)!), 
p. 224; Mon. N. A. Dipt., iv, p. 174. 
I’ai'o. May 29, HlKi; .July 19, 1911. 
( ienu.s ERIOPTERA Mci KPa 
Ei'ioplcrn Mci^cii, llligor’s Mas., ii, p. 202. 
Subgemis Erioptera Meisvn 
Erioptera septentrionis Osten-Sacken, Proc. Acad. Xat. Sci. Phila., 1S.59, 
p. 226; iMon. X. A. Dij)t., iv, p. l.Ao. 
\'ery coninion. Occurs from early Sprint; until late I'all; often 
seen in swarms in September. 
Erioptera chrysocoma O.sten-Sacken, Proc. Acad. Xat. Sci. Phila., 1859, 
•p. 226; Mon. X. A. Dipt., iv, p. 1.5.5. 
Rather common some seasons, rare others. .June, .July and 
August. Common in 1910 to 1912an(l ay;ain in .July, 1920. 
Erioptera vespertina O.sten-Sacken, Proc. .\cad. Xat. Sci. Pldla., 18.59, 
p. 226, pi. 4, fio'. 19; Mon. X. A. Dijit., iv, j). 1.57, pi. iv, fifi;. 20. 
X"o( common. .June 19, 1912; .June 21, 1919; .July IS, 1910. 
Erioptera chlorophylla Osten-.Sacken, Proc. Acad. Xat. Sci. Phila., 18.5'.), 
!>. 226; Mon. X. A. Dipt., iv, p. 1.57, j)!. i, fig. 7. 
Rare. July 0, 1920, Aujrust 29, 1919. 
Erioptera holoptica spec. nov. 
Near megulophUiahna Alexander. Eyes large, narrowly separated above, 
broadly continuous beneath. Thoracic stripes well-marked; scutum, scu- 
telhim and ])ostnotum .spotted with reddish-brown. 
Male, length, 3. .5 mm.; wing, 4.2 mm. 
Postrum and mouthiiarts lirownish; the narrow s|)ace between tlu' (wi's 
projects as a yellow, elevated ridgc'. Antennae rather short; scaped joints 
large, the first dark brown, the second paler; three to four basal joints ol lla- 
gellum pale yellow, raj)idly diminishing in thickness, outei’ joints very sKmi- 
der, light fuscous. 'Fhorax pah' yi'llow, prescutal stripes niddish-brow ii, 
very broad, leaving a very narrow interspace of the ground-color; the lateral 
.stripes of tln^ |)rescul uni are broailly continued upon I In' scutum, lca\ iug a. 
narrow line of the ground coloi’ ('ach side* of the uicdian line; a median striix' 
of scutellum and postnolum, and poslcrim- Ixirdcr ol scutcllum, y(*llowi.sh- 
TH.\NS. AM. KX'r. SOC., X1.\ II. 
