xe Hifory of Tipüla THUS. tre 4 | '99 
before, a number may be feen at the fame time upon one ear: 
they place themfelves in fuch a pofition that their anus Rands nearly 
at right angles with the margin of ‘the glume of that floret which 
they mean to pierce. But how dre they to introduce their eges 
-within the floret, for they depofit them between tbe exterior and 
interior valvules of the corolla ? To look at them when they are 
not engaged in this employment, their anus appears to be furnifhed 
with no inftrüment adapted to fo nice an operation ; but upon pref- 
fare it exerts (e) a long retrá&ile tube or vagina( f), which ün- 
fheaths an aculeus (g) (if I may fo term it) as fine as a hair and 
very long. This aculeus it introduces into the floret, and there de- 
pofits its eggs, which it ufually places upon the interior valvule of 
the córoibs; juft above the gogo After the: has done la ying her 
eges, the infé& withd 'aws he us eat caution and deli. 
beration : yet it fometimes happens ‘fiat Mei is friable to y effe& this; 
in Which cafe fhe is detained a prifoner until fome enemy devour her. 
In this fituation I have found them more than oncein my morning 
walks. - I was very defirous- of feeing the egg | pafs through the va- 
gina; but y firft attempts were unfuccefsful: at length I was grati- 
fied with this pleafing fpectacle. © TE: gatherei ed an ear upon which 
fome of our 77 ipulee were buly, and held it fo as to let a fun beam 
fall upon one of them; examining its operations under the three 
-glaffes of a pocket microfcope: 1 could then very dittin&ly perceive 
.. the eggs (4) paffing one after another, like minute air bubbles, 
through the vagina, the aculeus being "wholly inferted into the 
et. I examined this procefs. for full ten minutes, before the pa- 
tient little old difengaged itfelf; and at laft it was through my 
violence that fhe difcontinued her employment and flew 2 : 
(e) For this fenfe or the word exert, fee sme s Diet. Nos. iv. v. 
{(f) Tab. iv. fig.2.a (g) Fig. 2 b. (P) Fig. 2. c. 
02 p On 
