216 IOWA ACADEMY OP SCIENCES. 



PJiIoeotJiri2:)S 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, Bouch6. It is probable that H. 

 draccence 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 abiomen ferrug-inous; antennaB and feet pale; first and 



second joints of the former fuscous, sixth joint black.- 



--- -.- heemorrboidalis, Bouche. 



Yellowish-brown; wings white, sub-fasciate with brown.. drac^'er/a?, Heeg'er. 



Heliothrips hcBmorrhoidalis, Bouch^. 



Naturgeschichte der schadlichen und ntitzlichen Garten- 

 Insekten, p. 42 [1833]. 

 Hellothrips draccenm, Bouche. 



Sitzungsb. d. mathem — naturw.Klasse d. Wissensch., Vol. 

 XIV, p. 365 [1854]. 



GENUS SERICOTHRIPS. 



One species, Sericothrips? 2)erplexa, 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. Tn 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? pjcrplexa, n. sp. 



Male: Length, 1.33-1.55 mm. General color fuscous; legs and annulus 

 on antennas yellowish; thorax tinged with yellow-ferruginous; abdomen 



