216 
IOWA ACADEMY OP SCIENCES. 
PJiloeothrips mali, Fitcb. 
[First Report.] Trans. N. Y. State Agr. Soc. for 1854, Vol. 
XIV, p. 806. 
GENUS HELIOTHRIPS, HAL. 
This genus is represented in the collections by a single 
species, H. hcemorrhoidalis, Bouche. It is probable that H. 
dracmnce Heeger also, which occurs frequently in hothouses in 
this country and in Europe, is found in this state. These two 
species may be separated as follows: 
Fuscous, apex of abdomen ferruginous; antennae and feet pale; first and 
second joints of the former fuscous, sixth joint black 
hasmorrhoidsilis, Bouche. 
Yellowish-brown; wings white, sub-fasciate with brown Heeger. 
Heliothrips limmorrTioidalis, Bouche. 
Naturgeschichte der schadlichen und ntitzlichen Garten - 
Insekten, p. 42 [1833]. 
Heliothrips dracmncB, Bouche. 
Sitzungsb. d. mathem — naturw.Klasse d. Wissensch., Vol. 
XIV, p. 365 [1854]. 
GENUS SERICOTHRIPS. 
One species, Sericothrips? perplexa, containing representatives 
of the male sex only, has been doubtfully referred to this genus. 
This species possesses well marked characters, evidently of 
generic importance, which do not accord with those of any genus 
of this family with which I am familiar. They are as follows: 
Head somewhat flattened or depressed and produced in front 
with the ocelli placed very far forward; fourth antennal joint 
decidedly longer than the third, apex of abdomen in male 
formed like that of females of this family. In Burmeister’s 
Handbook of Entomology, Vol. 2, p. 413, the genus Sericothrips 
is characterized as having the abdomen covered with silky 
hairs, head hidden up to the eyes in the thoracic segment and the 
tip of the abdomen formed alike in both sexes. In the enumer- 
ation of species, the same authority records but a single species, 
hence it may prove that a more extended knowledge of allied 
forms will make it necessary to enlarge the limits of the genus, 
therefore it seems best to place this species here provisionally 
rather than to erect a new genus. 
Sericothrips? perplexa, n. sp. 
Male: Length, 1.33-1.55 mm. General color fuscous; legs and annulus 
on antennas yellowish; thorax tinged with yellow-ferruginous; abdomen 
