IOWA ACADEMY OF SCIENCES. 215 



FAM. II. STENOPTERID.S. 



A. Body above netted with elevated lines Gen. 2. Heliothrips. 



AA. Body above smooth. 



B. Abdomen clothed with silky hairs; apex CDnieal, formed alike in 



both sexes- ..Gen. 3. Sericothrips. 



BB. Body smooth; apex of abdomen unlike in the two sexes. 



C. Prothorax produced in front, and narrowed 



Gen. ■!. Chirothrips. 



CC. Prothorax not produced in front and narrowed. 



D. Last segment of abdomen with a pair of spines in female; 



male, wingless Gen. 5. Limothrips. 



DD. Last segment of abdomen unarmed. 



E. Last two segments of antenna? shorter than the sixth 



segment Gen. 6. Thrips. 



EE. Last two segments of the antennae longer than the 

 sixth segment ..Gen. 7. Belothrips. 



FAM. III. COLiEOPTRATID.E. 



A. Antennre with nine distinct segments.- Gen. 8. Melanthrips. 



A A. Antenna? apparently five jointed, the last four segments being 

 minute and compact 

 B. Body somewhat flattened; meso-metathorax broad; front wings 

 without fringe on costal border, and with four distinct cross 



veins; males with lateral abdominal appendages 



Gen. 9. Coleothrips. 



BB. Body cylindrical, mesothorax and metathorax constricted, wings 

 rudimentary Gen. 10 Aeolothrips. 



SYNOPSIS OF IOWA SPECIES. 



GENUS PHLCEOTHRIPS, HAL. 



A. Proximal joint of anterior tarsi armed with a tooth on inner side .-1 

 A A. Proximal joint of anterior tarsi unarmed... 2 



1. With postocular bristle; three bristles on each side of pro- 

 thorax; antennal joints 3-6 yellow .. verbasci, Osb. 



Without postocular bristle; a single bristle at each posterior 

 angle of prothorax; antennal joint 3 and base of joint 4, some- 

 times base of joint 5, yellowish nigra, Osb. 



2. Black; head slightly longer than wide; tube three times as 



long as wide carvfc. Fitch. 



Purplish-black; head one and one-half times as long as wide; 

 tube twice as long as wide ma//. Fitch. 



Phloeothrips verbasd, Osb. 



Description follows this paper. 

 PJiloeothrijjs nigra, Osb. 



Can. Ent., Vol. XV, p. 154 [1883]. 

 Phlaiothrips caryce, Fitch. 



[Third Report.] Trans. N. Y. State Agr. See. for 185G, Vol. 

 XVI, p. 446. 



