THE INSECT ASSOCIATION OF A LOCAL ENVIRONMENTAL COMPLEX. 
65 
Table III. 
Aquatic Diptera recorded in the Association, Intruders. 
Abbreviations as in Table I. f Indicates that the larval habits are not definitely known and only 
tentatively indicated. 
Family. 
Species. 
Month. 
Occur- 
rence 
Remarks on Habits. 
SlMULIIDiE 
Similium maculahim, Mg. 
8 
occ. 
Adult in moist places in herbage. 
Chironomid^e . 
Chironomus annularis, Deg. 
8, 9 
Culicid.® 
Culex pipiens . 
7, 8, 9 
,, 
Adults rest among meadow grasses. 
Tipulid^e 
Ptychoptera allnrnana, Mg. 
8 
com. 
Larva in stagnant water. 
f Rliypholophus nodulosus, Mg. 
5, 6 
infreq. 
Larva probably in marshy places or wet 
margins of ponds. 
f Erioptera trivialis, Mg. 
6 
” 
Supposedly either wholly aquatic or mud-in- 
habiting in larval stage. 
f Amalopis sp. 
6 
occ. 
Larvaof an allied species, A. Schineri (Bracer, 
p. 54) 1 in spring water. 
Tabankle 
Hmrnatopota pluvialis, L. . 
5-7 
com. 
According to Brauer (p. 60), 1 larva lives in 
earth jjnore probable that it is aquatic. 
LEPTIDiE . 
Atherix Ibis, F. 
8 
occ. 
The adult female lays her eggs on twigs over- 
hanging ponds. The eggs are cemented 
together and to the body of the female by 
a sticky substance. Often whole masses of 
eggs and dead females may encrust a twig. 
Syrphid^e 
Eristalis tenax, L. 
8 
com. 
1 The larvae in stagnant water. E. tenax is 
„ horticola, Deg. . 
8 
occ. 
1 cosmopolitan and will breed in drains and 
Helophilus pendulus, L. . 
5 
,, 
j sewage systems. The larva is the reputed 
,, lineatus, Fab. . 
8 
com. 
J “ rat-tailed ” form. 
SCIOMYZID^I 
\Neuroctena anilis , Fin. 
6 
occ. 
Adults frequent moist meadows. 
t Tetanocera laevifrons, Lw. . 
7 
” 
Probably aquatic. Larva of T. ferruginea 
has been found under leaves of water weeds, 
Lemna and Gallitriche (Brauer, p. 84). 1 
EPHYDRIDiB 
\Hydrellia griseola, Fin. 
10, 11 
v. com. 
Larvae probably semi-aquatic, inhabiting 
leaves of water plants. Adults occur abun- 
dantly in moist places. H. albilabris occurs 
as larva and pupa in the leaves of Lemna. 
Other species are recorded from sap of trees 
by Williston (p. 306). 2 
Brauer, F., loc. cit. 
2 Williston, T. W., North American Diptera, 3rd ed., 1908. 
