1907) 
JOJIXSOXSOME XORTH Ail ERIC AX SYRRUIDAE 
75 
SOMK XOUTII A.MF<;i{I( AX SVK IM 1 1 1 )AK. 
HV CIIAUI.KS \V. .lOHNSON, HOSTuX, MASS. 
I’li'iZA FEMoHAUS Loow, Cfiitiir., \’I, ;5S. 
'J^HE spccie.s of tile eemis Pipha as a whole, are (|uite (liffieiill to (letennine. 
Dr. Williston’s table, in his .Synopsis of Xorth .\ineriean Syrpliidae, would divide 
them readily into two eronjis — tho.se with the “abdomen nnirorinly blaek,” and 
those “with a basal interrn|)ted yellow I’aseia.” d'he type of P. jemn-aHs Loew, 
eonsistine of a single specimen from Illinois, is eharaeterized by having on the second 
segment, two large (punlrate marldngs, very narrowly interrnjited and formiiigaa 
broad fascia across the middle. ( )n the other hand, these abdominal markings 
vary in size nnttil they become obsolete or entirely wanting, in which ease we have 
the P. (ilhipilosa Williston. 
A large series collected by the writer in the vicinity of I’hiladel|>hia, I’a. (the 
locality For the two types of nlhipilD.m), shows that a large percentage have traces of, 
or cpiite prominent yellow markings on the second .segment. The sjieeies was 
common at Areola, Montgomery Co., Pa., April 27, 1S(M; later it was taken at Edge 
Ililb Pa., May .2, bStKl; it was also collected by ]\Ir. (’. 'P. (ireene at Lehigh Gap, 
Pa., .Inly 1, l!)Uo. Recently 1 have reeeiveil from Mr. Germain Reanlieu, four 
specimens collected in Montreal, Canada, May 1(1 to 20, lOOO, which show all grada- 
tions in the abdominal markings from the tvjiieal frmornll.t, to the more strongly 
marked sjieeimens assoeiateil with alhipUoxa. .Specimens of an intermediate char- 
acter have also been received from IMr. S. A. .Shaw, Hampton, X. II., May 17, 1004, 
and through Dr. W. E. Britton, eolleeted by Mr. II. L. Viereek, at Xew Haven, Conn., 
May 7, 1005, and by Rev. H. W. \Vinkley at Branford, Conn., May 25, 1005. 
Mr. G. Chagnon, also collected it at Rigand, Canada, May 2.S, bSOO. I have col- 
lected the tyjiieal albipUoxa at Anbiirndale, iMass., iMay’ 20, 1005. 
'Phere seems to be no strnctnral <-haraeter to .sejiarate the two; the dark tibial 
bands vary considerably in extent, being as a rule less jirominent in the typical jrm- 
omlin\ the slight clouding on the middle of the wing is also variable; the whitish 
pile is noticeably longer on the male than on the female. Among the twenty speci- 
mens before me .seven are females; four of these would be eon.siih'red tyjiieal fem- 
omlis and three intermediate. ( )f the males four are tyjiieal o//i//i//(i.s'o while eight 
are intermediate in character. The specimens vary from 7 to 0 mm. in length. 
