Ectenus Dallas, 1851
(updated 20 April 2005)
Ectenus
Dallas, 1851: 151, 173-174.
Type Species:
Cimex spectabilis
Burmeister, 1834 (= Ectenus servulus Kirkaldy, 1909), by monotypy.
Tribal Placement: This genus has
always been considered a member of the Halyini.
Included Species:
Comments: Ectenus was revised by Uichanco
(1949).
Key to Species of Ectenus (modified
from Uichanco, 1949)
1
Bucculae not prominantly produced anteroventrad, anteriorly forming a
right or subacute angle; postfrenal part of scutellum broad, more or less
broadly rounded apically, almost entirely stramineous, sublaevigate,
sparsely punctured; basal angles of scutellum, each with a stramineous,
sublaevigate spot, which is as large as apical spot or smaller; robust
species, width of body about one-half length |
2 |
-
Bucculae prominently produced anteroventrad into an acute or subacute
process; postfrenal part of scutellum narrow, roundly subacute at apex;
stramineous, laevigate spot only thinly bordering apical and lateral
areas; stramineous, laevigate spot at each basal angle of the scutellum
obsolete; more slender species, width of body slightly or considerably
less than on-half length |
5 |
|
|
2(1)
Head subequal in length to pronotum; first antennal segment not extending
beyond apex of head; laevigate spot on postfrenal projection of scutellum
generally impunctate; laevigate spots at basal angles of scutellum usually
as large as apical spot; an obsolescent sulcus barely extending to caudal
margin of third abdominal sternite [image
of syntype] |
generosus Stål |
-
Head markedly shorter than pronotum; first antennal segment extending by
about one-third its length beyond apex of head; laevigate spot on
postfrenal part of scutellum conspicuously punctured; laevigate spots at
basal angles of scutellum much smaller than apical spot; a well-defined
median sulcus extending to apex of fourth or to about middle of fifth
abdominal sternite |
3 |
|
|
3(2)
Lateral angles of terminal abdominal segments only moderately dentate,
those of sixth armed with a short spine; external genitalia of female
broadly rounded at apices; lateral halves of propleura very deeply and
thickly punctate |
mesoleucus Bergroth |
-
Lateral angles of terminal abdominal segments very prominently dentate and
armed with rather long spines; external genitalia of female acute;
propleura very sparsely and shallowly punctate, except for a small
irregular patch near lateral margin |
4 |
|
|
4(3)
Second antennal segment slightly shorter than basal [image
of syntype] |
pudicus Stål |
-
Second antennal segment about one-half longer than basal |
spinosus Uichanco |
|
|
5(1)
Anterior angle of pronotum with a conspicuous ectally directed denticle;
humeral angle more prominent, subacute; anterior area of pronotum broadly
subconfluent with posterior; second antennal segment somewhat longer than
third |
6 |
-
Anterior angle of pronotum without prominent denticle; humeral angle of
pronotum less salient, somewhat rounded; anterior area of pronotum more
strongly gibbous, between lateral one-fourth distinctly delimited from
posterior by a transverse uniserially punctate impression; second and
third antennal segments usually subequal in length |
servulus Kirkaldy |
|
|
6(5)
Rostrum extending to about middle of fifth abdominal sternite; median
sulcus extending to base of, or midway into, fifth abdominal sterniate [image
of syntype] |
aereus
Stål |
-
Rostrum extending to, or only a little beyond, caudal margin of third
abdominal sternite; median ventral sulcus on abdomen shorter or
posteriorly more obsolescent [image
of syntype] |
brevirostris Stål |
David A. Rider
Professor of Entomology
North Dakota State University
202 Hultz Hall
Fargo, ND 58105
E-Mail: David.Rider@ndsu.edu
Published by the Department of
Entomology
Prospective students may schedule a visit by calling 1-800-488-NDSU.
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