The Ohio ^J^atwalist, 
PUBLISHED BY 
The Biological Club of the Ohio State Uni^versity, 
Volume IV. NOVEMBER, 1903. No. 1. 
TABLE OF CONTENTS 
Hine — O n the Life History of Tiibanus Vivax 1 
Poindexter— The Development of the Spikelet and Grain of Corn 3 
Osborn— Note on Tinobreginns vittatus Van Duzee 9 
Griugs— Notes on Interesting Ohio Willows 11 
SCHAFFNER — Poisoiioiis and Other Injurious Plants of Ohio 16 
Kei.i.erman — M inor Plant Notes, No. 5 20 
Osborn -Note on Aradus ornatus Say 22 
SCHAFFNEI!— The Maximum Height of Plants. V 23 
News and Notes 23 
Griggs— Meeting of the Biological Club 24 
ON THE LIFE HISTORY OF TABANUS VIVAX. 
James S. Hine. 
Eggs. — Deposited in masses composed of several hundreds, on 
stones that project above the -water in riffles. Mass nearly round 
in outline, onlj' slightly convex, composed of about three laj’ers 
one above the other. Color of the -vrliole mass brown, mottled over 
tlie top with whitish. Female observed ovipositing June eighth. 
Larva. — In September and October of various years, when the 
water was low, I have taken a number of larvae among stones 
and rubbish in riffles. Sometimes they are taken in nets used for 
collectiug Corydalis larvae, and like them appear to be at home 
in the .swiftest part of the the stream ; in this respect differing 
from most tabanid larvae with which I am acquainted. Larvae 
taken late in the fall and kept in wet earth and fed on angle- 
worms or other animal food pass through their transformations 
and reach the adult stage in late spring or early summer. Since 
I have never come across these larvae in nature in spring their 
exact habits at this time of 5'ear are not known, but .suppose they 
leave the water and pupate in the earth near at hand. 
General color yellowish white, anterior margin of each thoracic 
segment and a narrow band including the prolegs on the anterior 
half of the first seven abdominal segments opaque and appearing 
darker than the other parts, which are more or less shining and 
usually finely striate longitudinally. Prothoracic segment divided 
b\' longitudinal grooves into four nearly equal parts, which may 
be called the dorsal, ventral and lateral areas. The lateral areas 
are shining and fineh' striated on posterior third and opaque on 
anterior two thirds : the dorsal and ventral areas are opaque on 
about anterior fourth and distinctl}- shining on the remaining 
