Insects Visiting Blossoms of Spirea 137 
sonal abundance. It is possible that a few of these bugs 
actually were obtaining food from the flowers, and if it 
should prove that the spirsa is the favorite source of food, 
the data for such forms should lend itself to the formation 
of a reliable curve showing seasonal distribution. In the 
case of Lopidia instabile, one of the most consistent hemip- 
terous visitors to spirea blossoms, the curve is at least not 
unbelievable. 
I am indebted to Prof. C. J. Drake, my colleague, in the 
department for his kindness in identifying the Hemiptera, 
listed in the table. 
NuMBER OF SPECIMENS OF DipTERA TAKEN Eacu 
WEEK, Juty 1—SepremsBeER 1, 1917. 
; ~ 
Species ad i 
eo) 
Asilus orphne Wk ......2.5.-.-: 1 1 
Criorhina analis Macq...........|..-+- EAs. <n reilles xs eed ch tae atereve Mic Si atl ice Suave epeiees 
Chilosia similas Shannon ........|..... 1 
Tents GLDUceDs UW) 6.5... 6.0 40 asia [lowell ere « 4 Sal eae ATCT te, GH 16 Pee NRO RIO Siac, € 
Hammerschmidtia ferruginea Fallen|.....|.....)..... UU) | Se Ne Re es ae A eee 
GRFTSAGASLEr TAOTEDES LW... «<< \e «-<10)|\oars eheilie ors 6, 6] renee BS Ue. of Geet pial oteas egal ste Geeks eee 
LECLIEUOTULILNET GIL ULTELEL) ON AG decane a orerere \leaticvaaillosckatenellterstavetelllase crete [ites ete 8 
CCCTIIUT USE PUEC LES OAV Gaye icles «led tole Weire eile ecare allle sv eehe,|larstavers 1 
ee Lereraiey ODS LOMVVILE och ya tis, oh coe cna ace Ai ell tetera oil pe aval eit eeenell erate ais 1 ‘ 
AZT OUP TSOP TT) IDES Iga SOOO SAGE] |G ROE GA Iee| lo erroo a Bice 1 est oA oe ye 
1 
1 
1 
CHIEGUESIEL DULCRELIG Willevs ©. cteve [ose fe dl pte kon|icetere allie oe silictere 6 
Gmbrinnalzntersisteus: WEI 2k cal ok le. fos [eel tullic edb] seeel 
RN TUEUOILLE LOI MUR CE UAW ove. coe cs see hecvcis e Nletetaesall feos wiacellle’ ovaietelerevercie'l'ce.a eve arate 
(SOP tE, ORLA CG Gg Bee Bee eee ek He Me VR SS Se | | LE ae hi io 
Sara PAES SALENTEA EM MG Pai Bt Pere auntie edi) L Reyer l al neha cl eee ete tel le tide here leone PAN ie eiere weal 
PLINUTLTESTET-CS DELIEET WW Ch cca oa sicncte heal cre atoll lave ene €)| es ovatere [tote aeere (aebe wi efiziete ere 1 La eee fee 
GPA ROS US Rl GANAS aL DE Wisvs) . A ile cineiwille « orere|lv choke clllchereraraie-ape @aotfoas sta Teas 55 
HGTASEMIPSE SLOT UEP NIAC ott payne ll trae tal neers elllre sine fie sce calineiete [lens oeilsrusicks 1 1 
AMOI LIT ED CULENT CELL OA YIC ETS ak eats el tetas Wee ins Aligesetabe onsite vaste Rado cally esa mals eeere 1 
TRUS TELELCONMEGWU GL 8 ito Sea OMIT oie calles Cle cate oil eretohars Weancte’ alterna senlficrereete [eaters 2 
Of the Diptera listed in the accompanying table only a 
few should probably be classified as other than casual visitors 
to the blossoms of spirza. It seems certain that some at least 
of the Syrphide obtain nectar from these flowers, and if 
these insects were present in any considerable numbers, they 
should furnish reliable data regarding the season of greatest 
abundance. However, the numbers in all cases were so lim- 
