LIBRARY

370
COLLEGE ENTOMOLOGY
single genus Sialis. These are placed in four groups as follows: California group,
seven species; American group, two species; Infumata group, eight species; and
the AequaJis group, two species. Syncordulia atrijrons McLachlan occurs in
Australia.
Family CORYDALIDJE Burmeister 1839 (CORYDALIDA. Leach 1815)
(Cor'y-dal'i-dre, from the Greek KopuoaAAis, a crested lark). Dobsonflies.
This is a family of remarkable aquatic insects, some of which are large and
conspicuous. It includes about 16 genera and 80 species. The adults, commonly
eolea-- -
labrum- .
.·mandible
,.. ,.maxillary palpus
.;-;:.Iabial polpus
. ____ antenna
FIG. 130. The dobsonflY, Corydaluli comulus (Linn.). A, adult male and head of female'
B, head and mouth parts of male; C, larva or "hellgrammite." '
referred to as dobsonflies in America, are taken frequently, but not abundantly,
in many parts of the country. The larVa! are variously known as "dobsons,"
"hellgrammites," "conniption bugs," "crawlers," "arnly," and "toe-biters"
and are used everywhere as bait for catching fresh-water fish, notably bass