IOWA ACADEMY OP SCIENCES. 215 



FAM. II. STENOPTERID^. 



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



AA. Body above smooth. 



B. Abdomen clothed with silky hairs; apex conical, 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. 4. 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 antennEe longer than the 

 sixth segment... Gen. 7. Belothrips. 



FAM. III. COLEOPTRATID.E. 



A. Antennfe with nine distinct segments Gen. 8. Melanthrips. 



AA. 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--. ...carya;, Fitch. 



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

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



PMoeotlirips verbasci, Osb. 



Description follows this paper. 

 Phloeothrips nigra, Osb. 



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

 Phlceothrips carijce, Fitch. 



[Third Report.] Trans. N. Y. State Agr. Soc. for 1856, Vol. 

 XVI, p. 446. 



