THE LARVA OF CTENOPHORA ANGUSTIPENNIS 
LOEW. 
SOESTER I. ANTHON, 
University of Washington. 
TABLE OF CONTENTS. 
| ELARG\ CSG cece oaee e Se e e  E g r 541 
EAE Vrman bee by thcenr eters. ote} 0R. 5 oe was Wigs in Geaoee s Secure ee 542 
PETC MIptlena Ci Matyas te so ous 4s coc Sebo ce ee 542 
Mietuods of hilingcand. Stainificos..|... + <..<<2oo 5. saece aa ee 545 
SESE PROV SECM NC en! Nae hy, The thee OSs nthe eee 546 
Pitre biccalenu SheMae ay Ste ig. 5 ap. tise Saas a ett oe 551 
Bite ml anys OVSUCM iy. esccrik.c 2 .ig Sesw we lecgat ea 0 Lce eee ee 553 
LS DISILS CICS) SNR ore RR oe me one ee ee 3 - 554 
LUTEESTGIS SEC A vas Siege Ane eee b amu RMane AN Beale ay LCT 2 555 
Nervous Tissue ....... Eee RCTs See SPM eb Sane ie Oy RE BM Sl 550 
PUIDEN. ct 96: AS cater cs se Re VE TS WR Cease Lach eet | 558 
IPISS SO Sood Sac OR Be cee en ee ESE es 0 ee eR me ina Sees cee Rian EE) 
LED DS CESEN TM eae er oe ce rae Ar RR Re a nr ORAS EDR ON red 559 
I. INTRODUCTION. 
The great majority of the Dipterous insects are unfortu- 
nately known only in the adult state. This lack of knowledge 
in regard to the larval and pupal conditions of many forms 
leaves a gap which cannot be filled for some time. _ This gap, 
as pointed out by Kellogg, is especially noticeable in the case 
of the lower forms in their immature stages, which have 
hardly been studied at all. This lack is particularly serious 
inasmuch as these are the more generalized forms, and repre- 
sent the ancestral types from which the highly specialized 
Tipulids have been evolved. It is to these lower forms that 
we must look for information regarding the genesis of the 
group. 
The larva of Ctenophora angustipennis is peculiarly inter- 
esting, and as the main anatomical features can readily be 
worked out, it offers a most suitable subject for study in 
elementary entomology. The chief structural details can even 
be made out in observing the live specimen and the larve 
can usually be secured in sufficient abundance to furnish plenty 
of material. 
(541) 
